WO2001013604A2 - Field programmable telephony interface module - Google Patents

Field programmable telephony interface module

Info

Publication number
WO2001013604A2
WO2001013604A2 PCT/US2000/022863 US0022863W WO2001013604A2 WO 2001013604 A2 WO2001013604 A2 WO 2001013604A2 US 0022863 W US0022863 W US 0022863W WO 2001013604 A2 WO2001013604 A2 WO 2001013604A2
Authority
WO
Grant status
Application
Patent type
Prior art keywords
interface
port
ctpx
lead
ring
Prior art date
Application number
PCT/US2000/022863
Other languages
French (fr)
Other versions
WO2001013604A3 (en )
Inventor
Reinhold Henke
Original Assignee
Ctpx Telecommunications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Interconnection arrangements between switching centres
    • H04M7/0096Trunk circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/005Interface circuits for subscriber lines
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/42314Systems providing special services or facilities to subscribers in private branch exchanges

Abstract

According to one embodiment, an electronic/software module or unit is disclosed. The unit provides analog telephony functionality. According to one example embodiment, the module or unit acts like a universal PBX (private branch exchange) analog line card. According to another embodiment, the module is field programmable. According to yet another embodiment, the module is operating system independent, and/or provides a serial programming interface. According to yet another example embodiment, the module or unit is provided in the form of a printed circuit module that may be mounted in an expansion slot of a computing system such as a personal computer or workstation.

Description

FIELD PROGRAMMABLE TELEPHONY INTERFACE MODULE

Related Application

This application claims the benefit of U.S. Provisional Application Serial Number 60/149,593, filed August 18, 1999 under 35 U.S.C. 119(e).

Field of the Invention The present invention relates to the field of telephony. More particularly, this invention relates to a telephony device providing universal PBX features.

Background of the Invention A variety of standard analog telephone interfaces have been established by international standards bodies and in a de facto manner. A challenge for a designer of telephony systems is adapting a design to meet each different standard, which can be a time consuming process, and add additional expense in the design and manufacture of a system. Thus, there is a need for a highly adaptable, field programmable telephony interface module that can provide a compatible interface to many different standard telephony interfaces, in a compact manner. Summary ofthe Invention

According to one embodiment, the present invention provides an electronic/software module or unit that provides analog telephony functionality. According to one example embodiment, the module or unit acts like a universal PBX (private branch exchange) analog line card. According to another embodiment, the module is field programmable. According to yet another embodiment, the module is operating system independent, and/or provides a serial programming interface. According to yet another example embodiment, the module or unit is provided in the form of a printed circuit module that may be mounted in an expansion slot of a computing system such as a personal computer or workstation.

According to yet another embodiment, one or more ofthe following features are provided in the module or unit, alone or in combination: FEATURES

Acts as a Universal PBX Analog Line Card

CMOS And TTL Compatible Inputs And Outputs

Direct A and B Signaling Bit Access Pins

Fully Remote Controllable Telephony Interface

Industrial Strength Isolation Barrier

In-System Programmability

Low Noise Design

Low Power Consumption

Low RFI Emissions

Meets Or Exceeds AT&T Bell System Technical Reference 43801

No DIP Switches and No Jumpers

On-Board Ring Generator

On-Board Battery Power Supply

Operating System Independent

Programmable:

CAS Bit Manipulations

Control Interfaces

Framing Modes

Internal Hybrid Balance Network

Loop-Back Modes

PCM Interfaces

Telephony Interfaces

Receive Gain

Ringing Frequency

Ringing Voltage

Telecom Voltage

Timeslot Assignment

Transmit Gain -Law or A-Law Companding Serially Programmable Interface Single Voltage Power Supply Input Small Dual-In-Line Package Footprint State-of-the-Art Technology Supports:

Extensive Channel Associated Signaling Bit Manipulation

Standard PCM Interfaces

Standard Telephony Interfaces

Standard Serial Interfaces

FXO, FXS, DPO, DPT, E&M, PLR, ETO, And TO nterfaces

Loop- Start, Ground-Start And Direct-Inward-Dialing • E&M Type I, II, III, IV, And V Signaling

Two-Wire And Four- Wire Transmissions

• Transparent Interface Conversion Operation

• Universal Asynchronous Receiver Transmitter Interface According to yet another embodiment ofthe invention, the module or unit is incorporated into or used so as to provide any one or more, alone or in combination, of the following applications: APPLICATIONS

Automatic Call Distributors

Central Offices • Digital Loop Carriers

Fax Boards

Fiber-In-The-Loop

Hybrid-Fiber/Coax

Gateways • Key Telephone Systems

Modems

Multiplexers

Private Branch Exchanges

PC-PBX • IP-PBX

Remote Terminals

Voice Processing Boards

Wireless Local Loop According to yet another example embodiment, one or more ofthe multitude of design details set forth in the accompanying specification are implemented in one or more ofthe above described embodiments. Detailed Description of the Drawing Figure 1 illustrates an overview ofthe present invention.

Description of the Preferred Embodiment In the following detailed description ofthe preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope ofthe present invention.

Attached hereto as Appendix A is a description of various embodiments of he invention. The Materials of Appendix A include the following: — Product Sheet (2 pages)

Assembly Drawing (1 page) Bill of Materials (1 page) Schematic Diagram (7 pages) Printed Circuit Board Artwork (13 pages) ~ Users Guide (80 pages)

Programmers Guide (48 pages)

Further, the entire contents ofthe above identified provisional application from which priority is claimed is hereby incorporated herein by reference. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the invention should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. cτpχισoι 4££«!»?

Field Programmable

Telephony Interface Benefits

CTPX Telecommunications, InC 901 Jefferson Ave, #301 St Paul, MN, 55IO2 (651) 293-0535 Fax: (651) 225-4533 www.ctpx.com fLeXiBle Computer Telephony Interface Solutions The CTPX1001 module uses channel as1 sociated signaling (A and B bits) to control the analog Interface. Technical Data

Module Interface Ports and Pins t

PORTS PER MODULE

Analog Port 1 (Telephony Interfaces) Digital Port 1 (PCM Interfaces) Control Port 1 (Serial Interfaces)

STANDARD TELEPHONY INTERFACES

Foreign Exchange Subscriber FXS (Loop-Start or Ground-Start) Foreign Exchange Office FXO (Loop-Start or Ground-Start) Dial Pulse Originating DPO (Direct Inward-Dialing) Dial Pulse Terminating DPT (Direct Inward-Dialing) E&M Lead Signaling E&M (2-Wire or 4 Wire) Pulse Link Repeater PLR (2-Wire or 4-Wιre) Transmission Only TO (2-Wire) Equalized Transmission Only ETO (4- ire)

STANDARD PCM INTERFACES

Applications AT&T Concentration Highway Interface

Multi-Vendor Integration Protocol MVIP

Mitel ST Bus

Siemens PCM Highway

Automatic Call Distributors STANDARD SERIAL INTERFACES

Digital Loop Carriers SPI Interlace 3-Wlre synchronous UART Interface 2-Wire asynchronous

Fax Boards

Fax Servers TERMINATION

Analog Port 9-Pin Header with 2 mm pitch

Fiber-in-the-Loop Digital Port 9-Pιn Header with 2 mm pitch Control Port 9-pin Header with 2 mm pitch

Hybrid-Fiber/Coax

IP Gateways POWER REQUIREMENTS

Key Systems Voltage +5 Vdc Tolerance +/• 5 %

Modems Current 0.1 A Maximum ower 0.5 W Maximum

Multiplexers

DIMENSIONS

PBX, PC-PBX, IP-PBX Length 3.750- (9.525 cm)

Remote Terminals Width 1.065" (2.705 cm)

Height 0.540- (1.372 cm)

Voice Processing Boards

Wireless Local Loop ENVIRONMENTAL

Operating Temperature +32 F To +10* F (0 C To 40 C) Storage Temperature •40 F To +185 F (-40 C To +85 C) Humidity 5 % To 95 % (Non Condensing)

The CTPX1001 module can be factory programmed to support unique interfaces per cusAll trademarks are property of their respective owners tomer specifications. Please call for details.

CTPX Teleco munications, InC 901 Jefferson Ave, «01 St Paiil.MN, 55102 (651)2M-0535 Fax: (651) 225-4533 www.ctpx.com fLeXiBle Computer Telephony Interface Solutions

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ISY 108-0027-01 Revision: C

11 Of : Material Ξ August 3, 2000 16:: 12:19 Page tern Quantity Reference Part MFR PART NUMBER

1 2 C15,C19 6.8N NIC ιNSFC682J50TRBl

2 2 C12,C9 ION NIC NSFC103J50TRB2

3 1 C14 27N NIC NSFC273 25TRB2

4 4 Cl,C10,C16,ι C22 0.47U NIC NMC-H1812Z5U474M2I

5 2 C23.C25 18P NIC NMC0603NPO180J50TI

6 3 C20,C24,C26 0.1U MURA GRM39X7R104K016AD

7 4 C4,C17,C18,ι C21 10U KEME T491A106K010AS

8 8 C2,C3,C5,C6 ,C7, C8,C11, 47U NIC NACZ470M50V6.3X8T] C13

9 • 1 Rll 10K DALE CRCW2512103J

10 1 R32 0.25 DALE WSL-2010-0.25-1%

11 1 R19 10 NIC NRC06J100TR

12 1 R23 100 NIC NRC06J101TR

13 1 R31 270 NIC NRC06J271TR

14 1 R30 330 NIC NRC06J331TR

15 1 R33 470 NIC NRC06J471TR

16 13 R1,R4,R7,R9 ,R1Cl,R13,R15, IK NIC NRC06J102TR R21,R25,R26 ,R27',R28,R29

17 3 R12,R18,R20 22K NIC NRC06J223TR

18 5 R2,R6,R17,R35,R36 47K NIC NRC06J473TR

19 4 R5,R14,R16 ] R22 100K NIC NRC06J104TR

20 2 R8,R3 IM NIC NRC06J105TR

21 1 R34 3.9M NIC NRC06J395TR

22 1 R24 220 CTS 75083R220

23 2 VS1,VS2 6.0V Gl SMBJ6.0CA-TR

24 1 BR1 BRIDGE Gl MB4S

25 2 D2,D3 SCHOTTKY Gl EGF1D

26 2 T2,T1 AUDIO MIDC 671-8424R

27 1 T3 PULSE FRNT SMT50-2A SMT4000V

28 1 Dl 30V MOT MMSZ5256BT1

29 1 Q2 PNP ZETX FZT956

30 1 Qi NPN ZETX FZTA14

31 4 Ul , U3 , U5 , U7 OPTO MOT 4N26S

32 6 U2 , U4 , U6 , U8 rU9, U10 SSR SSO AD4C111S-H

33 1 Ull SLIC LUCE LB1011AB

34 1 U14 CODEC LUCE T-7570-ML2

35 1 U15 MICRO ATML AT89S8252-24AC

36 1 TJ13 SMPS MAXM MAX749CSA

37 1 U12 SWITCH MAXM MAX4624EUT

38 1 Yl XTAL COR C35L11.0592MHz

39 3 Jl, J2, J3 2MM KELT 2PH109SG

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CTPX

Telecommunications, Inc. 90! Jefferson Avenue #301

Saint Paul, Minnesota 5510

Telephone: (651) 293-0535

Facsimile: (651) 2 5-4533 i www.ctpx.com

Patent Pending

Field Programmable Telephony Interface Module

Users Guide

08/09/2000 12:17:46 PM

fLeXiBle Computer Telephon y In terface Solutions CTPX

© MM, CTPX Telecommunications, Inc All rights reserved

P/N: 103-0017A Issue 1 2000

TRADEMARKS:

CTPX is a trademark of CTPX Telecommunications, Inc

CTPX1001 is a trademark of CTPX Telecommunications, Inc

FP-TiM is a trademark of CTPX Telecommunications, Inc φ All trademarks are property of their respective owners.

BELLCORE is a trademark of Bell Communications Research

FCC is a trademark of Federal Communications Commission

ITU is a trademark of International Telecommunications Union

MVIP is a trademark of GO- VIP, Inc

SPI is a trademark of Motorola Corporation

ST-BTJS is a trademark of Mitel Corporation

TOUCH-TONE is a trademark of AT&T

φ Information contained in this document is subject to change without notice!

f L eXiBle Compu ter Te lepho ny In terfa ce Solu tions CTPX

TABLE OF CONTENTS

APPLICATIONS 9

FEATURES J. 10

DESCRIPTION 11

OPERATION 12

TELEPHONY FUNCTIONS 12

OPERATIONAL TASKS 12

REGISTER SETTINGS 12

AUTONOMOUS OPERATIONS 12

MODULE CONNECTIONS 12

PROGRAMMING TASKS 12

FUNCTIONS 13

BATTERY FEED 13

OVERVOLTAGE PROTECΗON 13

RINGING 13

SUPERVISION 13

CODEC 13

HYBRID 13

TESTING 13

TASKS 14

CONVERTING 14

PASSING 14

RINGING 15

RINGING PARAMETERS 15

RING GENERATION. IS

RING DETECTION 16

RING TRIP 16

RING PRE-TRIP TEST 16

RINGER WAD , 16

ALERTING.- 17

PATTERNS 17

DAI CODE 1 PATTERN 17

DAI CODE 2 PATTERN 17

DA2 PATTERN. . - 17

DA3 PATTERN. 17

LEVELS i 18

DIGITAL MILLIWATT 18

2-WIRE TRANSMISSION 18

4-WIRE TRANSMISSION 18

SUPERVISION 18

SUPERVISORY STATES 18

SUPERVISORY EVENTS 18

SIGNALING 19

SIGNALING METHODS 19 fL eXiBle Com pu ter Te lephon y In terfa ce Solu tio ns 3 CTPX

SIGNALING TERMINALS 19

SIGNALING LEADS 19

SIGNALING TYPES 19

INTERFACES 20

INTERFACE WITH LOOP-START SUPERVISION . 21

Loop-Start Line Signaling 22

FXS-LS 22

FXO-LS 22

INTERFACE WITH GROUND-START SUPERVISION ....:... 23

Ground-Start Line Signaling 24

FXS-GS 24

FXO-GS 24

INTERFACE WITH LOOP-REVERSE-BATTERY SUPERVISION (DID) 25

DPT 26

DPO 26

INTERFACE WITH E&M LEAD SUPERVISION 27 28

E 28

M 28

E 28

M 28

E 28

INTERFACE WITH NO SUPERVISION 29

PORTS 30

FOREIGN EXCHANGE OFFICE (LOOP-START) 30

FOREIGN EXCHANGE SUBSCRIBER (LOOP-START) 31

FOREIGN EXCHANGE OFFICE (GROUND-START) 32

FOREIGN EXCHANGE SUBSCRIBER (GROUND-START) 33

DIAL PULSE ORIGINATING 34

DIAL PULSE TERMINATING. 35

E & M SIGNALING 36

PULSE LINK REPEATER 37

TRANSMISSION ONLY 38

EQUALIZED TRANSMISSION ONLY 39

CAS-BΓΓS 40

MANIPULATION 40

NORMAL A 40

INVERTED A 40

NORMAL A SWAPPED TO B 40

INVERTED A SWAPPED TO B 40

NORMAL B : 40

INVERTED B •. - 40

NORMAL B SWAPPED TO A 40

INVERTED B SWAPPED TO A 40

CONDITIONS 41

CONVERSIONS ~ 42

SPECIFICATIONS 43

PORTS PER MODULE 43

ANALOG INTERFACES 43

DIGITAL INTERFACES 43

CONTROL INTERFACES 43

TERMINATION 43

POWER REQUIREMENTS 43 fL eXiBle Computer Teleph ony In terfa ce Solutions 4 CTPX

DIMENSIONS 43

ENVIRONMENTAL 43

WEIGHT 43

TECHNICAL DATA 44

PRODUCT » 44

NETWORK 45

ABSOLUTE MAXIMUM RATINGS 45

CHARACTERISTICS 46

ELECTRICAL 46

TRANSMISSION 46

TIMING 46

PCM. 46

SPI 46

UART 46

MNEMONICS 47

EXTERNAL 47

ANALOG PORT. 47

DIG TAL PORT. 47

CONTROL PORT 47

OUTLINE 48

PIN DESCRIPTION 49

PIN-OUT 50

NOTICES 51

WARNINGS 51

HANDLING. 52

FCC PART 68 53

DID INFORMATION. 53

FCC PART 15 54

RFI INFORMATION. 54

APPENDIX ........ : 55

DIGIT CHARACTER SETS 55

DIAL PULSE .' 55

DUAL TONE MULTI FREQUENCY. .' 55

MULTI FREQUENCY 55

PULSE DIALING 56

DIAL-PULSE PARAMETERS 7 56

DIGITS. 56

INTERDIGΠAL PERIOD 56

SPEED 56

BREAK RATIO 56

START-MODES 57

LOOP-START. 57

GROUND-START 57

IMMEDIATE-START. 57

WINK-START 57

DELAY-DIAL 57

HUNTING 58

SEQUENTIAL HUNTING. 58 CIRCULAR HUNTING ; 58 fL eXiB le Com pu ter Teleph on y Iv f rfa ce Solu tion s 5 CTPX

RANDOM HUNTING 58

SIGNALING CONVERSION 59

DIRECT CONVERSION 59

INDIRECT CONVERSION 59

LOGIC CONVERSION 59

SMART CONVERSION. 4 59

FORCED CONVERSION. 59

CALL PROGRESS TONES , 60

DIAL-TONE 60

STUTTER DIAL-TONE 60

CALL WAITING TONE. 60

A UDIBLE RINGING TONE. 60

UNEBUSY TONE. 60

ALL-TRUNKS-BUSY TONE 60

RECEIVER-OFF-HOOK-TONE 60

DID INFORMATION 61

TRUNK POWER 61

EMERGENCY POWER 61

TROUBLE TICKET 61

POLARITY. 61

FIELD INFO 67

ADDRESSING CAPACITIES 61

DIGIT OUT-PULSE SCHEME 61

SPECIAL TRUNK SERVICE 62

DID TRUNKS WITH CALL TRANSFER CAPABILITY. 62

DID TRUNKS WITH OUT-DIAL CAPABILTTY. 62

TWO-WAY DID TRUNKS 62

E&M INFORMATION 63

E&MBASICS 63

COMPARISON OF E&M TYPES. 64

TYPE I 64

TYPE D 64

TYPE m. 64

TYPE IV 64

TYPE V 64

GLARE 65

GLARE CONDπiONS. 65

GLARE RESOLUTION..... 65

GLARE SPECIFICATIONS. 65

PBX LOSS PLAN 66

TRUNK DESIGNATION 66

ANALOG PORT OPERATION 66

TUTORIAL : 67

DID * 67

E&M 67

SIGNALING FACILITIES .' 68

ANALOG FACILITIES. '....: 68

DIGITAL FACILITIES. 68

TECHNICAL TIPS 69

AVOIDING GLARE 69

ORDERING DID TRUNKS. 69

BUSYING OUT DID TRUNKS. , 69

CHECKING THE TELECOM FUSE 69

PROTECTING FROM POWER SURGES 69

MEASUREMENTS 70

DC PARAMETERS 70

T&R LEADS 70 fL eXiBle Compu ter Telephony In terfa ce Solu tions 6 CTPX

E&M LEADS : 70

SG& SB LEADS. 70

ABBREVIATIONS 71

GLOSSARY 72

OPPOSITES 76

SUPPORT . 78

APPLICATION SUPPORT 78

SALES SUPPORT 78

SERVICE SUPPORT 78

TECHNICAL SUPPORT 78

RETURNS 78

RETURN MATERIAL AUTHORIZATION 78

WARRANTY 79

2 YEAR LIMITED PRODUCT WARRANTY 79

SERVICE 80

HARDWARE REPAIRS 80

FIRMWARE UPGRADES 80

TECH SUPPORT 80

CONTACT ADDRESS 80

fLeXiBle Computer Telephony Interface Solutions CTPX

CTPX Telecommunications,. Inc

Providing

Computer Telephony

Interfaces

And

System

Integration

Technologies

CTPX

Computer Telephony Platforms fLeXiBle by design

1001

1 = Module Level Product 0 = PC Bus Interface 0 = Telephony Bus Interface 1 = single Analog Telephony Interface Port

fL eXiBle Com puter Teleph ony In terfa ce S olution s CTPX

APPLICATIONS

Automatic Call Distributors

Central Offices

Digital Loop Carriers

Fax Boards

Fiber-In-The-Loop

Hybrid-Fiber/Coax

Gateways

Key Telephone Systems

Modems

Multiplexers

Private Branch Exchanges

PC-PBX

IP-PBX

Remote Terminals

Voice Processing Boards

Wireless Local Loop

fLeXiBle Computer Telephony Interface Solutions CTPX

FEATURES

Acts as a Universal PBX Analog Line Card

CMOS And TTL Compatible Inputs And Outputs

Direct A and B Signaling Bit Access Pins

Fully Remote Controllable Telephony Interface

Industrial Strength Isolation Barrier

In-System Programmability

Low Noise Design

Low Power Consumption

Low RFI Emissions

Meets Or Exceeds AT&T Bell System Technical Reference 43801

No DIP Switches and No Jumpers

On-Board Ring Generator

On-Board Battery Power Supply

Operating System Independent

Programmable:

CAS Bit Manipulations

Control Interfaces

Framing Modes

Internal Hybrid Balance Network

Loop-Back Modes

PCM Interfaces

Telephony Interfaces

Receive Gain

Ringing Frequency

Ringing Voltage

Telecom Voltage

Timeslot Assignment

Transmit Gain μ-Law Or A-Law Companding Serially Programmable Interface Single Voltage Power Supply Input Small Dual-In-Line Package Footprint Sate-of-the-Art Technology Supports:

Extensive Channel Associated Signaling Bit Manipulation

Standard PCM Interfaces

Standard Telephony Interfaces

Standard Serial Interfaces

FXO, FXS, DPO, DPT, E&M, PLR, ETO, And TO Interfaces

Loop-Start, Ground-Start And Direct-Inward-Dialing

E&M Type I, II, III, IV, And V Signaling

Two-Wire And Four-Wire Transmissions Transparent Interface Conversion Operation Universal Asynchronous Receiver Transmitter Interface

fL eXiBle Com puter Telep hon y In terfa ce Solu tio ns 10 CTPX

DESCRIPTION

CTPX1001™ is a Field Programmable - Telephony Interface Module (FP-TiM). The module is a dual-in-line printed circuit assembly.

FP-TiM consists of three user programmable ports:

• ANALOG

• DIGITAL

• CONTROL

The analog port connects to analog telephony interfaces, the digital port connects to digital telephony interfaces, and the control port connects to the host processor interface. These three ports allow the designer and user to choose the appropriate telephony interface when the system is configured either in manufacturing, or in the field. This flexibility adds convemence, low cost, and quick time to market to designing modern communication systems or updating existing telephony systems. The module takes care of the many analog interfaces allowing the designer to focus on the digital design aspects ofthe project.

The Field Programmable Telephony interface Module CTPX1001 performs the functions ofthe following devices:

Data Access Arrangement (DAA) Subscriber Line Interface Circuit (SLIQ Universal PBX Line Card

S P 1 UAI rr

+5VdC fL e XiB le Comp u ter Teleph ony Interfa ce Sol tions 11 CTPX

OPERATION

The analog module ports can be configured for Foreign eXchange Subscriber (FXS), Foreign exchange Office (FXO), Dial Pulse Terminating (DPT), and Dial Pulse Originating (DPO) operation The E and M (E&M) and Pulse Link Repeater (PLR) analog port operation can be configured for either 2-wire or 4-wire transmission. The module also supports interfaces with no signaling like Transmission Only (TO) and Equalized Transmission Only (ETO). The module supports the following start-modes: Loop-Start (LS), Ground-Start (GS), Immediate-Start (IS), Wink-Start (WS), and Delay-Dial (DD). The Dial Pulse (DP) addressing information is passed from the analog port to the appropπate Channel Associated output Bits. The Dual Tone Multi Frequency (DTMF) and Multi Frequency (MF) addressing information is converted and passed directly from the analog port into the digital pulse code modulation (PCM) stream. CTPX 1001 supports the basic analog Public Switched Telephone Network (PSTN) interfaces with Loop-Start supervision, Ground-Start supervision, Loop-Reverse-Battery (DID) supervision, E and M (E&M) supervision, and no (NO) supervision.

TELEPHONY FUNCTIONS

• Battery Feed

• Overvoltage Protection

• Ringing

• Supervision

• Codec

• Hybrid

• Testing

OPERATIONAL TASKS

• Converting Analog Signaling to Digital Channel Associated Signaling (CAS)

• Converting Analog Audio to Digital Pulse Code Modulation (PCM)

REGISTER SETTINGS

• Analog Configuration

• Digital Configuration

• Control Configuration

AUTONOMOUS OPERATIONS

• Ring Generation

• Ring Trip

• Ring Detection

• Signal Validation

MODULE CONNECTIONS

• Pin Header

PROGRAMMING TASKS

• Programming

• Configuring

• Operating

fL e XiBle Com pu ter Teleph ony In terfa ce Solu tio n s 12 CTPX

FUNCTIONS

The CTPX1001 provides and enables the common analog Line Card BORSCHT telephone functions.

BATTERY FEED

• Battery Voltage Generation for energizing the lines or trunks.

• Loop Current Detection for recognizing line or trunk seizures.

OVERVOLTAGE PROTECTION

• External Transient Voltage Suppressors for Overvoltage Protection are required for Secondary Protection.

• External Fuses for Current Limitation are required for Secondary Protection.

RINGING

• Ring Pre-Trip Test for checking if the telephone is already Off-Hook before the application of ringing.

• Ring Generation for outgoing calls.

• Ring Detection for incoming calls.

• Ring Trip for shutting off the ring generator when the telephone answers during ringing.

SUPERVISION

• Ring on/Ring off"

• On-hook/Off-hook

• Normal Polarity/Reverse Polarity

• Audio on-hook

• Caller ID protocol

CODEC

• Analog to Digital Conversion

• Digital to Analog Conversion

HYBRID

• 2-Wire to 4-Wire Circuit Conversion

TESTING

• An External Relay is required to provide Test Access.

fL eXiBle Com puter Teleph ony In terfa ce Solution s 13 CTPX

TASKS

CONVERTING

The CTPX1001 interfaces with the following lines or trunks: t

• Loop-Start

• Ground-Start

• Direct-Inward-Dialing

• E&M Lead Signaling

PASSING

The CTPX1001 is transparent for the following payloads, tones, and signals. The information passes between the analog and digital port without modification or intervention:

Voice Information Payload Data Information Payload Fax Information Payload Call Progress Tones Dual-Tone Multi-Frequency Tones Multi-Frequency Tones Dial-Pulse Signals Supervisory Signals

fL eXiBle Com puter Teleph ony In te rfa ce Solution s 14 CTPX

RINGING

The process of alerting the other side of the interface consists of a ring generator, ringer load, ring detector, and ring trip detector.

RINGING PARAMETERS

Ring Voltage (45 Vrms to l50 Vrms)

Ring Frequency (16 Hz to 68 Hz)

Ring Burst (200 ms to 2000 ms)

Ring Silent Interval (200 ms to 4000 ms)

Ring Trip (100 ms to 200 ms)

Ring Pattern (see Alerting)

Ring Cycle (6 seconds)

Ring Duration (from a few ms to a few minutes)

Ring Current (Ring Voltage/Ringer Load)

Ringer Load ((77000000 OOhhmmss aatt 2200 HHzz == RREENN11,, 11440000 OOhhmmss aatt 2200 HHzz = = REN5)

RING GENERATION

The ring generator creates an alternating current (AC) waveform of a specific voltage and frequency. The voltage and frequency requirements may differ from application to application and country to country. The ring generator is turned on for a certain ring burst duration followed by a ring silence interval. The generator rings into the ringer load on the other side of the interface. The application of the ring burst and silence interval is repeated as often as required by the application.

15 CTPX

RING DETECTION

The presence of the ringer load causes an alternating current (AC) to flow in the loop. The AC causes the mechanical bell to ring the piezoelectric buzzer to chirp and the electronic ring detection circuit to trigger. If the AC is absent then the ringer load is either disconnected, not present, or the line is not hooked up properly.

RING TRIP

When the other side ofthe interface answers the ringing by going off-hook and entering into a low direct current (DC) resistance state, a ring trip condition is present and the ring generator must be shut off within a specific interval. Ringing should be tripped within a maximum of 200 ms after the transition to the Off-hook State. This requirement should be met regardless weather the off-hook occurred during the ringing or silent interval. A ring-trip interval of less than 100 ms is desirable.

Conditions across the Tip and Ring leads in which ringing should not be tripped:

• A 2uF Capacitor

• Five C4A Ringers

• A lOkOhm Resistive Load

• An Off-Hook Signal less than 12 ms in duration

RING PRE-TRIP TEST

Prior to the application of ringing, the line is being tested for a low resistance condition. The test is performed by briefly applying battery to the line with the tip lead negative with respect to the ring lead. This test checks if the telephone that is connected to the other side of the interface is already in the Off-hook State before the application of ringing.

RINGER LOAD

The ringer load may consist of:

A Mechanical Bell

A Piezoelectric Buzzer

An Electronic Ring Detection Circuit

fL eXiBle Co mp u ter Teleph ony Interfa ce Solu tions 16 CTPX

ALERTING

The individual ring bursts may be of different duration in order to create Distinctive Alerting (DA) patterns. This way different ring cadences can be created for Basic Business Group (BBG) operation.

PATTERNS

DA type 1 code 1 (2.0 s on, 4.0 s off) DA type 1 code 2 (1.0 s on, 1.0 s off, 1.0 s on, 3.0 s off) DA type 2 (0.8 s on, 0.4 s off, 0.8 s on, 4.0 s off) DA type 3 (0.4 s on, 0.2 s off, 0.4 s on, 0.2 s off, 0.8 s on, 4.0 s off)

DA1 CODE 1 PATTERN

DA1 CODE 2 PATTERN

DA2 PATTERN

DA3 PATTERN

φ Two full 6 second ring cycles shown in each figure

f L e XiBle Com puter Teleph ony In te r fa ce S olutions 17 CTPX

LEVELS

DIGITAL MILLIWATT

The reference for setting transmission levels in a telephony communication system is the digital milliwatt. The digital milliwatt is created by a sequence of PCM bytes which generates the 0 dBm, 1000 Hz signal and defines the 0 dB TLP (Transmission Level Point) at the digital interface

Byte l [00001111]

Byte 2 [00000000]

Byte 3 [00000000]

Byte 4 [10011001]

Byte 5 [11111111]

Byte 6 [10011001]

Byte 7 [11111111]

Byte 8 [01100110]

2-WIRE TRANSMISSION

Transmit/Receive 0 dB to -3.0 dB TLP

4-WIRE TRANSMISSION

Receive > +7.0 dB TLP

Transmit -16.0 dB TLP

SUPERVISION

Supervision indicates the condition of a call and shows the readiness of equipment to respond to an attempt to establish or release a connection.

SUPERVISORY STA TES

Supervisory states indicate to equipment, to an operator, or to a caller that a particular state in a call has been reached and may signify the need for action to be taken. A supervisory state may last from a few milliseconds to infinity.

• Idle

• Busy

• Alerting

• Talking

SUPERVISORY EVENTS

Supervisory events indicate a change from one state to a new state. Each port on either side of the interface may establish or terminate the connection. This results in four possible variations of the call scenario.

• Seize

• Answer

• Disconnect

• Hang-up

fL eXiBle Comp uter Teleph on y Interfa ce So lu tions 18 CTPX

SIGNALING

There are four major analog signaling facilities:

• Loop Signaling (LS, GS, LRBS) supported by CTPX 1001

• E&M Signaling (E&M, PLR) supported by CTPX1001

• Duplex Signalmg (DX) not supported by CTPX1001

• Single Frequency Signaling (SF) not supported by CTPX1001

SIGNALING METHODS

The way by which a Loop or E&M type telephony port notifies the other side of a change in state is limited to five primary signaling methods:

LOOP open or closed loop indicates the idle or off-hook state

BATTERY normal or reverse battery indicates the idle or answered state

RINGING no ringing or AC ringing indicates the idle or alerting state

E-LEAD open or ground E-lead indicates the idle or seized state

M-LEAD ground/open or battery/ground M-lead indicates the idle or seized state

SIGNAUNG TERMINALS

The signaling terminals of analog telephony interfaces are:

• T-Lead Tip terminal ofthe 2-Wire port (4-wire transmit output)

• R-Lead Ring terminal of the 2-Wire port (4-wire transmit output)

• Tl-Lead Tip terminal ofthe 4-Wire port (4-wire receive input)

• Rl-Lead Ring terminal ofthe 4-Wire port (4-wire receive input)

• E-Lead E terminal of the E&M port

• M-Lead M terminal ofthe E&M port

• SG-Lead Signal Ground terminal ofthe E&M port

• SB-Lead Signal Battery terminal ofthe E&M port

SIGNAUNG LEADS

The number of signaling leads depends on the type of interface selected:

• 2 leads Loop-Start, Ground-Start, and Loop-Reverse-Battery (DID)

• 4 leads 2-Wire, E&M, Type I and V signaling

• 6 leads 2-Wire, E&M, Type D., m, and IV signaling

• 8 leads 4-Wire, E&M, Type 0; m, and IV signaling

SIGNALING TYPES

There are five different signaling types used exclusively for interfaces with E&M supervision. The types differ physically and electrically.

TYPE I E: open when idle ground when seized (ground return required)

M: ground when idle battery when seized (ground return required)

TYPE Π E: open when idle ground when seized (no ground return required)

M: open when idle battery when seized (no ground return required)

TYPE ΓH E: open when idle ground when seized (no ground return required)

M: ground when idle battery when seized (no ground return required)

TYPE IV E: open when idle ground when seized (no ground return required)

M: open when idle ground when seized (no ground return required)

TYPE V E: open when idle ground when seized (ground return required)

M: open when idle ground when seized (ground return required) fL eXi Ble Co mp u ter Teleph o ny Interfa ce So lu tio ns 19 CTPX

INTERFACES

An interface is the boundary between two pieces of equipment across which all signals pass. The interface definition includes:

• Physical Connector

• Transmit and Receive Levels

• Audio Impedance

• Signal Timing

• Sequence of Events

• Meaning of Signals.

There are two sides to every telephony interface. The telephone cable connects one side to the other side. An equipment port terminates each side. One port generates an event or function while the other port detects the event or function and acts on it accordingly. The equipment ports are generally described as:

• Central Office (CO)

• Customer Premise Equipment (CPE)

• Private Branch Exchange (PBX)

There are five common analog interfaces. Each has a specific purpose and different operation:

• Interface with Loop-Start Supervision

• Interface with Ground-Start Supervision

• Interface with Loop-Reverse-Battery Supervision

• Interface with E&M Lead Supervision

• Interface with No Supervision

Loop-Start example: On a loop-start (POTS) line the Central Office (CO) generates ringing while the telephone (CPE) that is connected to the CO detects the ringing and alerts the called party.

• The CO port generates battery and the CPE port detects battery.

• The CO port generates ringing and the CPE port detects ringing.

• The CO port generates dial tone and the CPE port detects dial tone.

• The CPE port generates off-hook and the CO port detects off-hook.

• The CPE port generates digits and the CO port detects digits.

• The CPE port generates on-hook and the CO port detects on-hook

Loop-Reverse Battery example: On a Direct-Inward-Dialing (DID) trunk the Central Office (CO) goes off-hook and does the dialing while the private branch exchange (PBX) trunk port powers the trunk.

• The PBX port generates battery and the CO port detects battery.

• The PBX port generates normal polarity and the CO port detects normal polarity.

• The PBX port generates reverse polarity and the CO port detects reverse polarity.

• The CO port generates off-hook and the PBX port detects off-hook.

• The CO port generates digits and the PBX port detects digits.

• The CO port generates on-hook and the PBX port detects on-hook.

On most analog interfaces both sides are not the same. There are electrical differences between both interface ports. The only analog ports without electrical differences are the interfaces with No Supervision and the E&M type V interface. The E&M type V interface is mainly used with ITU compliant equipment. fL eXiBle Comp u ter Teleph ony In te r fa ce S olutions 20 CTPX

INTERFACE WITH LOOP-START SUPERVISION

This interface is often referred to as Plain-Old-Telephone-Service (POTS). "Plain-Old-Telephone-Service" is a service provided by the Central Office for common in-bound and out-bound call traffic. Loop-start is a form of signaling in which the end office supplies battery between tip and ring conductors. A terminal indicates an off-hook state by allowing current to flow. Loop refers to the closing of switch contacts across the tip and ring conductors to allow current to flow in the telephone loop. The interface with loop-start supervision is normally not polarity sensitive However, it is good practice to always connect the tip-lead from one side to the tip-lead ofthe other side and connect the ring-lead from one side to the ring-lead from the other side.

The following equipment ports are part of this interface:

• Foreign Exchange Office (FXO)

• Foreign Exchange Subscriber (FXS)

This interface is used to connect:

• CO to Telephone

• CO to Key Telephone System

• CO to FAX/Modem

• PBX to Station Set or Telephone

• PBX to Voice Messaging System

• PBX to FAX/Server

Loop-Start Trunk States

Conditions No Ringing Ringing

Open Loop Idle Alerting

Closed Loop Seized Talking

Advantages: Most common interface with the most simple call set-up.

Disadvantages: Off-hook signals can collide and lock up the trunk, causing a condition called""Glare."

Loop-Start Tip and Ring Voltage Diagram

Idle Alerting Answer Talking Flash Disconnect Jlr oJlJjxel .

fL e XiBle Com pu ter Teleph ony In te rfa ce Solu tions 21 CTPX

H = High DC resistance loop (greater than 30,000 Ohms).

L = Low DC resistance loop (100 Ohms to 2,400 Ohms).

N = Normal battery with the tip lead at ground potential (+Vdc) and the ring lead at battery potential (-Vdc).

O = Open circuit condition (Battery and/or ground leads are removed from the circuit).

X = Any condition

fLeXiBle Computer Telephony lηtejrface Solutions 22 CTPX

INTERFACE WITH GROUND-START SUPERVISION

This interface most commonly connects the trunk side of a PBX to the servicing Central Office. Ground-start is a form of signaling in which grounding a wire indicates a request for service by either interface side. The interface with ground-start supervision is polarity sensitive. Always connect the T-lead from one side to the T-lead of the other side and connect the R-lead from one side to the R-lead from the other side. If the T-lead and the R-lead are reversed, the PBX will not be able to initiate out-bound calls.

The following equipment ports are part of this interface:

• Foreign Exchange Office (FXO)

• Foreign Exchange Subscriber (FXS)

This interface is used to connect:

• CO to Private Branch Exchange

Interface With Ground-Start Supervision

Ground-Start Trunk States

Advantages: Automatic resolutions of call collisions ("Glare"). Disadvantages: Complicated call set-up.

Ground-Start Tip/Ring Voltage Diagram

Idle Seize Alerting Answer Talking Flash Disconnect Idle

f L eXiB le Com pu te r Te lephony In terfa ce Solu tio ns 23 CTPX

H = High DC resistance loop (greater than 30,000 Ohms).

L = Low DC resistance loop (100 Ohms to 2,400 Ohms).

N = Normal battery with the tip lead at ground potential (+Vdc) and the ring lead at battery potential (-Vdc).

O = Open circuit condition (Battery and/or ground leads are removed from the circuit).

X = Any condition

fLeXiBle Computer Telephony Interface Solutions 24 CTPX

INTERFACE WITH LOOP-REVERSE-BATTERY SUPERVISION (DID)

This interface is also known as Direct-Inward-Dialing Service or DID service. DID is a function provided by the Central Office for in-bound call traffic only. The customer premise equipment (PBX/VMS) typically receives the last 3 to 7 digits of the telephone number dialed by the caller through the Central Office which is coifiiected at the other side of the DID trunk. The PBX/VMS uses the DID digits to route and place the call to a specific person (station) or during a ring-no- answer/busy-no-answer condition to an individual mailbox. The loop-reverse-battery-signaling interface is polarity sensitive. It makes a difference which way the tip and ring wires are hooked up to the public switched telephone network. If the wires are reversed, the trunk busies out and the caller may hear the all-trunks-busy or fast busy signal.

The following equipment ports are part of this interface:

• Dial Pulse Originating (DPO)

• Dial Pulse Terminating (DPT)

This interface is used to connect:

• CO to Private Branch Exchange

• CO to Voice Messaging System

• PBX to Voice Messaging System

• PBX to Telephone Answering System

• TAS to Voice Messaging System

Interface With Loop-Reverse-Battery (DID) Supervision

Advantages: Direct station access, direct voice mail access, and direct fax access.

Disadvantages: Polarity sensitivity may cause wiring problems. T must be connected to T and R must be connected to R.

Loop-Reverse-Battery (DD3) Tip/Ring Voltage Diagram

Idle Seizure Wink Addressing Ringback Answer Talking Flash CO Disconnect Idle

Normal on-hook f L eXiB le Compu ter Te lephony lπ te$£a ce Solu tio ns 25 CTPX

H = High DC resistance loop (greater than 30,000 Ohms).

L = Low DC resistance loop (100 Ohms to 2,400 Ohms).

N = Normal battery with the tip lead at ground potential (+Vdc) and the ring lead at battery potential (-Vdc).

R = Reverse battery with the tip lead at battery potential (-Vdc) and the ring lead at groimd potential (+Vdc).

O = Open circuit condition (Battery and/or ground leads are removed from the circuit).

X = Any condition

fLeXiBle Computer Telephony Interface Solutions 26 CTPX

INTERFACE WITH E&M LEAD SUPERVISION

The term E&M describes interfaces used by switches within the confines of a building. E&M signaling is not used in outside wiring. On an E&M trunk, the carrier facilities or PBX Tie Lines may dial many or no digits in DTMF or MF via in-band signaling or Dial Pulse via E-lead or M-lead out-of-band signaling. The switth uses the digits to route and place the call to a specific person (station) or during a ring-no-answer/busy-no-answer condition to an individual mailbox. The term E&M originates from the old Ear and Mouthpieces associated with early telephones. The E and M lead-signaling interface is wiring sensitive. Always connect the E-lead from one side to the E-lead of the other side. If the E and M-lead are hooked up reversed, the interface will not operate as expected

The following equipment ports are part of this interface:

• E and M Signaling (E&M)

• Pulse Link Repeater (PLR)

This interface is used to connect:

• PBX to Private Branch Exchange

• PBX to Channel Bank

• PBX to Carrier Facilities

• PBX to Tie Trunks

The Interface With E&M Supervision

E- and M-Lead Trunk States

Advantages: Quiet call control. No clicking noise when answering, hook-flashing or disconnecting. Disadvantages: More than two wires required. Lead hook-up may cause some wiring errors.

E-Lead or M-Lead Voltage Diagram

Idle Wink Seize Connect Flash Connect Disconnect Idle

On-hook Level

1 r Off-hook Level

f L eXiBle Comp u ter Teleph o ny In terfa ce Soluti o ns 27 CTPX

E and M Type I and Type in Line Signaling

Line States Interface Conditions Comments

M E

Idle Ground Open Trunk is waiting for a new call

PLR Seizure Battery Open PLR lands a new call on the E&Mltrunk

E&M Seizure Ground Ground E&M lands a new call on the E&M trunk

Connect Battery Ground Called party and calling party are communicating

E and M Type II Line Signaling

Line States Interface Conditions Comments

£

Idle Open Open Trunk is waiting for a new call

PLR Seizure Battery Open PLR lands a new call on the E&M trunk

E&M Seizure Open Ground E&M lands a new call on the E&M trunk

Connect Battery Ground Called party and calling party are communicating

E and M Type TV and Type V Line Signalir ιg

Line States Interface Conditions Comments

M E

Idle Open Open Trunk is waiting for a new call

PLR Seizure Ground Open PLR lands a new call on the E&M trunk

E&M Seizure Open Ground E&M lands a new call on the E&M trunk

Connect Ground Ground Called party and calling party are communicating

Open = High DC resistance loop (greater than 20,000 Ohms). Looped = Low DC resistance loop (0 Ohms to 2,400 Ohms). Battery = Battery potential (-Vdc). Ground = Ground potential (+Vdc).

fL e XiBle Com puter Telep hon y In te rfa ce Solution s 28 CTPX

INTERFACE WITH NO SUPERVISION

No supervision indicates that the trunk is a "dry" circuit. "Diy" means that there is no battery power or flow of any current involved. There is also no signaUng associated with this kind of interface. The talk-path consists of a balanced wire pair and is suitable for long haul signal transmissions. The signaling interface without any supervision is not wiring sensitive. However, it is good practice to always connect the T-lead from one side to the T-lead of the other side and connect the R-lead from one side to the R-lead from the other side. The Interface with no supervision maintains a constant and direct talk-path connection to the other side.

The following equipment ports are part of this interface:

• Transmission Only ('TO')

• Equalized Transmission Only (ETO)

This interface is used to connect:

• Switch to Leased Line

• Switch to Paging Terminal

• Switch to Satellite Terminal

The Inl erface with NO Supervision C )iagram

ETO and TO Trunk State

Advantages : Direct connection between equipment. Disadvantages: No call control or supervision.

f L eXiBle Com pu te r Telephon y In terfa ce Solu tio n s 29 CTPX

PORTS

FOREIGN EXCHANGE OFFICE (Loop-Start) i

The Foreign Exchange Office port looks like a 2500 type telephone station set. This port is also referred to as the CPE side ofthe loop-start interface. Its counterpart is the FXS port configured for loop-start supervision.

Abbreviation FXO'

Alerting RINGING

CAS Bits A and B

Signaling Type NONE

Start-Mode LOOP-START

Transmission 2-WIRE

Wire terminals TIP and RING

The FXO Port in Loop-Start Mode

d LOOP

NGING

RINGING -» <r LOOP

f L eXiBle Comp u ter Teleph ony In te rfa ce S olutions 30 CTPX

FOREIGN EXCHANGE SUBSCRIBER (Loop-Start)

The Foreign Exchange Subscriber port looks like a telephone wall outlet jack when configured for loop-start supervision. This port is also referred to as the CO side of the loop-start interface. Its counterpart is the FXO port configured for loop-start supervision.

Abbreviation 'FXS' Alerting RINGING CAS Bits an B Signaling Type NONE Start mode LOOP-START Transmission 2-WIRE Wire terminals TD? and RING

The FXS Port in Loop-Start Mode

RINGING

sed LOOr

LOOP -» <r RINGING

fL eXiBle Comp uter Teleph ony In terfa ce S olutions 31 CTPX

FOREIGN EXCHANGE OFFICE (Ground-Start)

The Foreign Exchange Office port in ground-start mode looks like a PBX trunk circuit. This port is also referred to as the PBX trunk side of the ground-start interface. Its counterpart is the FXS port configured with ground-start supervision. l

Abbreviation 'FXO' Alerting RINGING CAS Bits andB Signaling Type NONE Start mode GROUND-START Transmission 2-WIRE Wire terminals TIP and RING

The FXO Port in Ground-Sta rtMode

RCV A = rrlnse 1 OOP RCV B = R-GROUND

XMT A - T-GROUND XMT = no RINGIN

RINGING -» <r LOOP T-GROUND -» « R-GROUND

fLeXiBle Computer Telephony Interface Solutions 32 CTPX

FOREIGN EXCHANGE SUBSCRIBER (Ground-Start)

The Foreign Exchange Subscriber port in ground-start mode looks like a CO network interface circuit. This port is also referred to as the CO side of the ground-start interface. Its counterpart is the FXO port configured for ground-start supervision.

Abbreviation 'FXS' Alerting RINGING CAS Bits A and B Signaling Type NONE Start Mode GROUND-START Transmission 2-WIRE Wire terminals TIP and RING

The FXS Port in Ground-Start Mode

RCV A = T-GROUND RCV B = no RINGING

XMT A = closed LOOP XMT B = R-GROUND

LOOP -* BRINGING R-GROUND-* <-T-GROUND

fL eXiBle Co u ter Teleph ony In te rfa ce Solution s 33 CTPX

DIAL PULSE ORIGINATING

The Dial Pulse Originating port looks like a CPE trunk circuit configured for loop-reverse-battery supervision. This port is also referred to as the CPE side of DID trunk. Its counterpart is the DPT port.

Abbreviation 'DPO' Alerting NONE CAS Bits A=B Signaling Type NONE Start Modes IMMEDIATE, WINK, and DELAY-DIAL Transmission 2-WπtE Wire terminals TIP and RING

The DPO Port

OP OP

LOOP-* <r BATTERY

fLeXiBle Computer Telephony Interface Solutions 34 CTPX

DIAL PULSE TERMINATING

The Dial Pulse Terminating port looks like a CO network interface circuit configured for loop-reverse-battery supervision. This port is also referred to as the CO side ofthe DID trunk. Its counteipart is the DPO port.

Abbreviation DPT' Alerting NONE CAS Bits A = B Signaling Type NONE Start Mode IMMEDIATE, WINK, and DELAY-DIAL Transmission 2-WIRE Wire terminals TIP and RING

fLeXiBle Computer Telephony Inte f^^ Solutions 35 CTPX

E&MSIGNALING

The E&M signaling port looks like a signaling circuit configured for E&M supervision. This port is also referred to as the normal E&M side of the E and M signaling interface. Its counterpart is the PLR port.

Abbreviation 'E&M' Alerting NONE CAS Bits A=B Signaling Type I,Π,ΠLIV,V Start Mode IMMEDIATE, WINK, and DELAY-DIAL Transmission 2-WIRE and 4-WIRE Wire terminals T, R, TI, RI, E, M, SG, and SB

The E&M Port

fLeXiBle Computer Telephony Interface Solutions 36 CTPX

PULSE LINK REPEATER

The Pulse Link Repeater looks like a trunk circuit configured for E&M supervision. This port is also referred to as the reverse E&M side ofthe E and M signaling interface. Its counterpart is the E&M port.

Abbreviation PLR' Alerting NONE CAS Bits A=B Signaling Type Π,Π IV,V Start Mode IMMEDIATE, WINK, and DELAY-DIAL Transmission 2-WIRE and 4-WERE Wire terminals T, R, TI, RI, E, M, SG, and SB

The PLR Port

fLeXiBle Computer Telephony Interface, Soluti ons 37 CTPX

TRANSMISSION ONLY

The Transmission-Only port looks like a two-wire terminal circuit configured for no supervision. This port is also referred to as the 2-wire dry voice circuit This port may carry talk-path information in either direction on the same wire pair. The advantage of the TO is that transmit and receive signals are carried on one wire pair only. Its counterpart is the TO port.

Abbreviation TO'

Alerting NONE

Signaling Type NONE

Start Mode NONE

Transmission 2-WIRE

Wire terminals T, R

The TO Port

fL eXiBle Comp u ter Teleph ony Interfa ce S o lu tions 38 CTPX

EQUALIZED TRANSMISSION ONLY

The Equalized Transmission-Only port looks like a four-wire terminal circuit configured for no supervision. This port is also referred to as the 4-wire dry voice circuit. The port carries transmit and receive talk-path information on separate wire pairs. The advantage ofthe ETO is that signals can easily be amplified, attenuated, or equalized as required. Each wire pair of this four-wire circuit has to be defined as transmit only and receive only port. Its counterpart is the ETO port.

Abbreviation ETO' Alerting NONE CAS Bits does not care Signaling Type NONE Start Mode NONE Transmission 4-WIRE Wire terminals T, R, TI, and RI

ETO Analog Port Signaling to CAS Signaling Bit Conversion

Input To Port XMT A XMT B RCV A RCV B Output From Port

No SIGNALING No SIGNALING

fL eXiB le Compu te r Te lepho n y I n terfa ce Solu tio ns 39 CTPX

CAS-BITS

MANIPULATION

NORMAL A

From Analog interface -^ A normal A -> to Digital Interface

INVERTED A

From Analog Interface - A invert A -^ to Digital Interface

NORMAL A SWAPPED TO B From Analog Interface -* A normal B -> to Digital Interface

INVERTED A SWAPPED TO B From Analog Interface -^ A invert B -> to Digital Interface

NORMAL B

From Analog interface -> B normal B -> to Digital Interface

INVERTED B

From Analog Interface -> B invert B -> to Digital Interface

NORMAL B SWAPPED TO A From Analog Interface -> B normal A -> to Digital Interface

INVERTED B SWAPPED TO A From Analog Interface -* B invert A -* to Digital Interface

fL eXiBle Co puter Telep h ony In te rfa ce S olution s 40 CTPX

CONDITIONS

When High:

The A-Xmt bit from the FXO/LS port indicates a remote condition of FIXED LOW BIT LEVEL

The A-Xmt bit from the FXO/GS port indicates a remote condition of TJP-GROUND

The A-Xmt bit from the FXS/LS port indicates a remote condition of CLOSED LOOP

The A-Xmt bit from the FXS/GS port indicates a remote condition of CLOSED LOOP

The A-Xmt bit from the DPO port indicates a remote condition of CLOSED LOOP

The A-Xmt bit from the DPT port indicates a remote condition of REVERSE POLARITY

The A-Xmt bit from the E&M port indicates a remote condition of M-LEAD SEIZURE

The A-Xmt bit from the PLR port indicates a remote condition of E-LEAD SEIZURE

The A-Xmt bit from the ETO port indicates a remote condition of NO EFFECT

The A-Xmt bit from the TO port indicates a remote condition of NO EFFECT

When Hi h:

The B •X bit from the FXO/LS port indicates a remote condition of NO RINGING The B -Xmtbit from the FXO/GS port indicates a remote condition of NO RINGING The B -Xmtbit from the FXS/LS port indicates a remote condition of FIXED HI BIT LEVEL The B' ■Xmt bit from the FXS/GS port indicates a remote condition of RING-GROUND The B Xmtbit from the DPO port indicates a remote condition of CLOSED LOOP The B- Xmtbit from the DPT port indicates a remote condition of REVERSE POLARITY The B- ■Xmtbit from the E&M port indicates a remote condition of M-LEAD SEIZURE The B- •Xmtbit from the PLR port indicates a remote condition of E-LEAD SEIZURE The B- ■Xmtbit from the ETO port indicates a remote condition of NO EFFECT The B- ■Xmt bit from the TO port indicates a remote condition of NO EFFECT

When High:

The A- Rev bit to the FXO/LS port creates a local setting of CLOSED LOOP The - •Rrcv bit to the FXO/GS port creates a local setting of CLOSED LOOP The A- ■Rev bit to the FXS/LS port creates a local setting of NO EFFECT The A- ■Rev bit to the FXS/GS port creates a local setting of TD?-GROUND The A- Rev bit to the DPO port creates a local setting of REVERSE POLARITY The A- Rev bit to the DPT port creates a local setting of CLOSED LOOP The A- Rev bit to the E&M port creates a local setting of E-LEAD SEIZURE The A- Rev bit to the PLR port creates a local setting of M-LEAD SEIZURE The A- Rev bit to the ETO port creates a local setting of NO EFFECT The - Rev bit to the TO port creates a local setting of NO EFFECT

When High: The B •Rev bit to the FXO/LS port creates a local setting of NO RINGING The B ■Rev bit to the FXO/GS port creates a local setting of NO RINGING The B Rev bit to the FXS/LS port creates a local setting of FIXED HI BIT LEVEL The B Rev bit to the FXS/GS port creates a local setting of RING-LEAD GROUND The B Rev bit to the DPO port creates a local setting of CLOSED LOOP The B Rev bit to the DPT port creates a local setting of REVERSE POLARITY The B ■Rev bit to the E&M port creates a local setting of M-LEAD SEIZURE The B ■Rev bit to the PLR port creates a local setting of E-LEAD SEIZURE The B ■Rev bit to the ETO port creates a local setting of NO EFFECT The B ■Rev bit to the TO port creates a local setting of NO EFFECT

fL e XiBle C om pu ter Teleph ony ln te rfa ce_^S olu tion s 41 CTPX

CONVERSIONS

This set of diagrams shows a couple examples of direct conversion. Direct conversion is based on a straight A-bit to A-bit and B-bit to B-bit conversion.

Loop-Start

Ground-Start

E and M Lead Signaling (with 4-Wire to 2-Wire Conversion example shown)

No Supervision (with 2-Wire to 4-Wire Conversion example shown)

-* To Terminal <- From Terminal

fLeXiBle Computer Telephony Interface Solutions 42 CTPX

SPECIFICATIONS

PORTS PER MODULE

Analog Port 1 Digital Port 1 Control Port 1

ANALOG INTERFACES

Foreign Exchange Subscriber FXS (Loop-Start or Ground-Start) Foreign Exchange Office FXO (Loop-Start or Ground-Start) Dial Pulse Originating DPO (Loop-Reverse-Battery-Signaling, DID) Dial Pulse Terminating DPT (Loop-Reverse-Battery-Signaling, DID) E&M Lead Signaling E&M (2-Wire or 4-Wire) Pulse Link Repeater PLR (2-Wire or 4-Wire) Equalized Transmission Only ETO (4-Wire) Transmission Only TO (2-Wire)

DIGITAL INTERFACES

CONTROL INTERFACES

SPI Interface 3-Wire Synchronous UART Interface 2-Wire Asynchronous

TERMINATION

Analog Port 9-Pin SIP (Header with 2-mm pitch) Digital Port 9-Pin SD? (Header with 2-mm pitch) Control Port 9-Pin SD? (Header with 2-mm pitch)

POWER REQUIREMENTS

Voltage +5 Vdc (Nominal) Tolerance +/-5 % (Maximum) Current 0.1 A (Maximum) Power 0.5 W (Maximum)

DIMENSIONS -

Length 3.750 « (9.525 cm)

Depth 1.065 " (2.705 cm)

Height 0.540 « (1.372 cm)

ENVIRONMENTAL

Operating Temperature +32 °F to +104 °F (0 °C To 40 °C) Storage Temperature -40 °F to +185 °F (-40 °C To +85 °C) Humidity 5 % to 95 % (non Condensing)

WEIGHT

Net Weight l Oz (28 g) f L eXiBle Compu ter Te lephony In terfa ce Solu tio ns 43 CTPX

TECHNICAL DATA

PRODUCT

fLeXiBle Co puter Telephony Interface Solutions 44 CTPX

NETWORK

ABSOLUTE MAXIMUM RATINGS

fLeXiBle Computer Telephony Interf t^Solutions 45 CTPX

CHARACTERISTICS

ELECTRICAL

TRANSMISSION

TIMING

PCM

SPI

UART

fLeXiBle Computer Telephony Interface Solutions 46 CTPX

MNEMONICS

EXTERNAL

ANALOG PORT

The Analog port consists ofthe 2-Wire and 4-Wire interface terminals.

T TIP-LEAD 4-Wire E&M Transmit or 2-Wire E&M Transmit/Receive

R RING-LEAD 4-Wire E&M Transmit or 2-Wire E&M Transmit Receive

TI T P 1 -LEAD 4-Wire E&M Receive

RI RINGl-LEAD 4-Wire E&M Receive

E E-LEAD or 2-Wire LOOP, Tip-Lead

M M-LEAD _ or 2-Wire LOOP, Ring-Lead

SG SIGNAL GROUND-LEAD

SB SIGNAL BATTERY-LEAD

TRC TELECOM REFERENCE CONDUCTOR or PROTECTIVE EARTH (PE)

DIGITAL PORT

The digital port consists ofthe PCM interface and the CAS interface terminals.

The PCM interface controls the serial media stream via the following leads:

• BCLK PCM, Bit Clock Input

• FSRX PCM, Frame Synchronization Pulse Input

• DR PCM, Data Receive, Stream Input

• DX PCM, Data Transmit, Stream Output

• TSX PCM, Timeslot, Transmit Enable, Stream Output

The CAS interface controls the parallel signaling bits via the following leads:

• ARCV CAS BIT, A Receive Input

• BRCV CAS BIT, B Receive Input

• AXMT CAS BIT, A Transmit Output

• BXMT CAS BIT, B Transmit Output

The +5 Vdc module power is connected to the following leads:

• VDD POWER +5.00 Vdc Supply

• GND GROUND +5.00 Vdc Return

CONTROL PORT

The control port consists ofthe SPI interface and the UART interface terminals.

The SPI Interface is a 3 -Wire synchronous communication method using the following leads:

• RST RESET Input

• SCK SPI Clock Input

• CSS SPI Chip Select Input

• SDO SPI Data Output

• SDI SPI Data Input

The UART Interface is a 2-Wire asynchronous communication method using the following leads:

• RXD UART, Receive Input

• TXD UART, Transmit Output

f L eXiBle Compu te r Telephony In terfa ce Sol tion s 47 CTPX

OUTLINE

φ All dimensions are in inches

Header Pin Length is 0.235" φ The Drawing is not to scale. fLeXiBle Comp ter Telephony Interface Solutions 48 CTPX

fLeXiBle Computer Telephony Interface Solutions 49 CTPX

PIN-OUT

φ Bottom View. Looking directly onto the header pins.

φ All dimensions are in inches fLeXiBle Computer Telephony Interface Solutions 50 CTPX

NOTICES

WARNINGS When using your telephone equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shock, and injury to persons, including the following:

• Read and understand all instructions

• Follow all warnings and instructions

• Unplug the module from the telecom connector before cleaning

• Use a damp cloth for cleaning

• Do not use liquid cleansers or aerosol cleaners

• Do not use this product near water

When installing this module into your system, please make sure that the module earth ground pin is securely connected to the systems chassis or telecom reference conductor terminal and that the system is plugged into a grounded three-prong outlet. Incorrect grounding can result in harmful or fatal electrical shock or component damage.

Use caution when installing or modifying telephone lines.

® Changes or modifications to this product not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment

f eXiB le Compu te r Telep h on y In terfa ce Solu tions 51 CTPX

HANDLING

Proper care must be taken when handling and installing the module:

• Observe the absolute maximum ratings for all ports

• Avoid exposure to electrostatic discharge (ESD)

• Prevent the application of reverse polarity to logic Power (+5 Vdc)

• Provide filtered logic power to the module

• Never plug or unplug the module while powered

fL e XiBle Com puter Teleph ony In te rfa ce Solution s 52 CTPX

FCC PART 68

The Federal Communications Commission (FCC) has established rules that permit CTPX1001 to be directly connected to the public switched telephone network (PSTN). Standardized jacks are used for these connections. CTPX 1001 should not be used on party lines or coin lines. ι

If CTPX1001 is malfunctioning, it may be causing harm to the telephone network. CTPX1001 should be disconnected until the source of the problem can be determined and until repair has been made. If repair is not done, the . Telephone Company may temporarily disconnect service.

The Telephone Company may make changes in its technical operations and procedures; if such changes affect the compatibility of CTPX1001, the Telephone Company is required to give adequate notice of the changes. You will be advised of your right to file a complaint with the FCC.

If the Telephone Company requests information on what equipment is connected to their lines, please inform them ofthe following:

• The Telephone Number This Unit Is Connected To (NBR #)

• The Ringer Equivalence Number (REN #)

• The User Order Code Jack Required (USOC #)

• The Service Order Code (SOC #)

• The Facility Interface Code (FIC #)

• The FCC Registration Number (FCC #)

DID INFORMATION

Allowing this equipment to be operated in such manner as not to provide proper answer supervision is in violation of part 68 ofthe FCC rules.

And:

PROPER ANSWER SUPERVISION IS WHEN:

This equipment returns answer supervision to the PSTN when DID calls are:

• Answered by the called station

• Answered by an attendant

• Routed to a recorded announcement that can be administered by the CPE user

• Routed to a dial prompt

This equipment returns answer supervision for all direct-inward-dialing calls forwarded to the PSTN. Permissible exceptions are:

• A call is unanswered

• A busy tone is received

• A reorder tone is received

f L eXiBle Com ute r Te lephon y In terfa ce Solu tions 53 CTPX

FCC PART 15

This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 1 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more ofthe following measures:

RFI INFORMATION

• Re-orient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/television technician for help.

fL eXiBle Com puter Telep h ony In terfa ce Solution s 54 CTPX

APPENDIX

DIGIT CHARACTER SETS

DIAL PULSE

DUAL TONE MULTI FREQUENCY

MULTI FREQUENCY

fLeXiBle Computer Telephony Interface Solutions 55 CTPX

PULSE DIALING

Pulse dial addressing is used for loop and E&M analog signaling facilities. The process of dialing the dial-pulse addressing digits consists of a series of break and make signals separated by an interdigital period (IDP).

DIAL-PULSE PARAMETERS

DP Digits (digit zero to digit nine)

DP Interdigital Period (180 ms to ∞ ms typical range) (300 ms nominal value)

DP Speed (8 pps to 12 pps typical range) (10 pps nominal value)

DP Break Ratio (40 % to 80 % typical range) (64 % nominal value)

Dial-Pulse Voltage Diagram

Off-Hook Level

On-Hook Level

1st break followed by 1st make followed by 1st IDP represents the digit one 2 breaks and 2 makes followed by 2nd IDP represents the digit two

3 breaks and 3 makes followed by 3rd IDP represents the digit three

4 breaks and 4 makes followed by constant off -hook represent the digit four

DIGITS

The dial pulse digits consist of the numbers 0 - 9. The individual dial-pulse digit ONE is represented by 1 break. The digit ZERO is represented by a series of 10 consecutive breaks.

INTERDIGITAL PERIOD

The spacing between two digits is represented by the interdigital period and marks the boundary between two consecutive digits and the end ofthe last digit.

SPEED

The dial pulse digits consist of the numbers 0 - 9. The individual dial-pulse digit "one" is represented by 1 break. The digit ZERO is represented by a series of 10 consecutive breaks. This measure is expressed in pulses per second.

BREAK RATIO

The break time is often expressed as a percent of the break plus make period. This ratio represents a measure of dial pulsing and is often called "percent break."

f L e XiBle Com puter Telep h ony In te rfa ce S olutions 56 CTPX

START-MODES

Start-modes are associated with specific interfaces. The start mode defines how the trunk/line call scenario proceeds after the initial "Request-for-Service" or seizure signal. In most cases the release of the addressing digits is dependent on an acknowledge signal in response to the trunk/line seizure.

• Loop-Start

• Ground-Start

• Immediate-Start

• Wink-Start

• Delay-Dial

LOOP-START

A form of signaling for FXS and FXO ports, in which one side of the interface closes the loop The LOOP is closed to indicate the readiness to process the call Start dialing digits after detecting the dial tone.

GROUND-START

A form of signaling for FXS and FXO ports, in which one side ofthe interface grounds a wire to indicate a request for service. The GROUND is applied to a lead to indicate the readiness to process the call. Start dialing digits after detecting the dial tone.

IMMEDIATE-START

A form of signaling for DPT, DPO, E&M, and PLR ports, in which immediately after the trunk seizure, the addressing digits are being released. The IMMEDIATE release of the addressing digits happens regardless whether the other interface side is ready to receive the digits or not. Start dialing digits a short time after the seizure signal.

WINK-START

A form of signaling for DPT, DPO, E&M, and PLR ports, which is based on hand shaking between the two interface sides. After a trunk seizure the other side acknowledges the readiness to process the call by a brief transition to the Off-hook State. The WINK lets the seizing side ofthe interface know that it is now ready to receive the addressing digits. Start dialing digits after reception ofthe wink signed.

DELAY-DIAL

A form of signaling for DPT, DPO, E&M, and PLR ports, which is based on hand shaking between the two interface sides. After a trunk seizure the other side returns the off-hook condition while idle. The off-hook signal remains until the port is ready to process the call. This process allows a controlling DELAY ofthe addressing digit release. Start dialing digits after release ofthe delay- dial signal

fL eXiBle Com puter Teleph ony In terfa ce S olution s 57 CTPX

HUNTING

Trunks or lines are oftentimes combined to form logical groups for specific in-bound or out-bound applications. For different reasons different hunt-group arrangements are available.

• Sequential Hunt-Group

• Circular Hunt-Group

• Random Hunt-Group

SEQUENTIAL HUNTING

In a sequential hunt-group all calls land on available trunks in a sequential pattern. This hunt-group arrangement is mostly used for Loop-Start Lines that hook up to a Key-System. There is a primary line, which activates the preferred first button in a group of key system buttons. When no button is lit, then the next call will always land on the primary line to activate the first key telephone button. The second call will land on the secondary line, which in turn activates the preferred second button on the key system telephone.

CIRCULAR HUNTING

In a circular hunt-group all calls land on available trunks in a circular pattern. This hunt-group arrangement is mostly used for Direct-Inward-Dialing trunk groups. There is no dedicated primary trunk in a circular hunt group set-up. The next call will always land on the next available trunk in the group. This allows for easy detection and trouble shooting of specific failed DID trunks. This trunk group arrangement is also known as rotational hunting.

RANDOM HUNTING

In a random hunt-group all calls land on available trunks in a random pattern. This hunt-group arrangement is the least popular set-up. Random hunting allows every trunk to have calls landed on evenly when averaged over time.

fL e XiBle C o p uter Teleph ony In te r fa ce S olu tions 58 CTPX

SIGNALING CONVERSION

The individual port provides analog to digital and digital to analog conversion for the talk-path and signaling information. The talk-path information converts from an analog signal to 8-bit PCM. The signaling information converts from an analog state to Channel Associated Signaling (CAS) using A, B, C, and D bit assignments and vice versa. Each port can be converted from one interface to another using different conversion principles. The talk-path information is being passed straight from the "input" port to the "output" port.

• The Voice/data/fax and tone information is passed through

• Signals like IDLE, SEIZE, BREAK, MAKE, WINK, FLASH, DISCONNECT are passed through.

• Any signalmg method can be converted from one to another, (see table below)

DIRECT CONVERSION

Direct conversion is based on straight A-bit to A-bit and B-bit to B-bit conversioa This works because the A- and B-bits have the same name and function. In this case the signaling bit is passed directly from one digital side to the other digital side.

For example: FXO to FXS port for the purpose of signal amplification.

INDIRECT CONVERSION

Indirect conversion is based on A-bit to A-bit and B-bit to B-bit conversion. The A- and B-bits have the same name but not the same function. In this case some signaling bits are ignored.

For example: EXO-GS to FXS-LS port for the purpose of start-mode conversion.

LOGIC CONVERSION

Logic conversion is based on A-bit to B-bit and B-bit to A-bit conversion when the A- and B-bits do not have the same name but the function causes the same result Proprietary methods are used to achieve proper interface conversion results.

For example: PLR to FXO for the purpose of signaling conversion.

SMART CONVERSION

Smart conversion is based on intelligent signaling A-bit to A- or B-bit and B-bit to B- or A-bit conversion when the A- and B-bits have neither the same name nor the same function. Proprietary algorithms are used to achieve proper interface conversion results.

For example: DPO to FXS for the purpose of supervision conversion.

FORCED CONVERSION

Forced conversion is based on a fixed receive signaling bit conversion. The user sets the A- and B-bits to a to a pre-determined state (0 or 1) for proper interface conversion results.

For example: ETO to E&M port for the purpose of signaling ehmination.

f L e XiBle Com puter Teleph ony In te r fa ce Solu tion s 59 CTPX

CALL PROGRESS TONES

Call progress tones are not generated by the CTPX 1001. The attached DSP resource or other tone generation method if required must create audible tones.

Here is a list of common call progress tones that are associated with the North American PSTN:

DIAL-TONE

350 Hz+440 Hz (steady on)

This tone lets the calling party know that the local central office is ready for service and the dialing process may begin. This tone is commonly known as the "PRIMARY DIAL TONE" signal.

STUTTER DIAL-TONE

350 Hz+440 Hz (3 x (0.10 s on, 0.10 s off), then steady on)

This tone lets the caller know that a special service has been activated. For example: Stutter Dial Tone may appear on the line after a hook-flash requesting a secondary dial request. Or, Stutter Dial Tone may be used to indicate to the caller that a message is waiting at the voice mail service provider. This tone is commonly known as the "SECONDARY DIAL TONE' signal.

CALL WAITING TONE

440 Hz (0.30 s on, 9.70 s off, repeating)

This tone lets the called party know during an already established connection that another caller wants to establish a connection. This tone is commonly known as the "CALL INTERRUPTION" signaL

AUDIBLE RINGING TONE

440 Hz-M80 Hz (following the Ring Pattern)

This tone lets the caller know that the connection to the calling party has been established and that the called party is being alerted. This tone is commonly known as the "RLNGBACK" signal.

LINE BUSY TONE

480 Hz+620 Hz (0.50 s on, 0.50 s off, repeating)

This tone lets the caller know that the connection to the calling party can not be established due to an off hook- condition at the called party's destination. This temporary condition happens if the called party has the line already in use. This tone is commonly known as the "BUSY' signal.

ALL-TRUNKS-BUSY TONE

480 Hz+620 Hz (0.25 s on, 0.25 s off, repeating)

This tone lets the caller know that the connection to the calling party can not be established due to a circuit contention condition. This temporary condition happens if there are more calls coming in than trunks are available. This tone is also known as the "FAST BUST' signal.

RECEIVER-OFF-HOOK-TONE

1400 Hz+2060 Hz+2450 Hz+2600 Hz (0.10 s on, 0.10 s off, repeating)

This tone alerts the station user that the receiver may have been accidentally in the off-hook condition. This tone is commonly known as the "HOWLING' signal.

f L eXiBle Compu te r Telephony In terfa ce Solu tions 60 CTPX

DID INFORMATION

TRUNK POWER

The customer premise equipment powers Direct-Inward-Dialing Trunks. In this case, CTPX 1001 provides power to the connected DID trunks. The central office will only provide service to direct-inward-dialing trunks, which are properly connected and powered. A service call to the local telephone company might be required to start the DID trunk operation.

EMERGENCY POWER

It is strongly recommended to operate all TELEPHONY equipment with a back up power-unit or un-interruptible power supply (UPS). This emergency power arrangement avoids service calls to the central office and reduces trouble tickets from the Telephone Company.

TROUBLE TICKET

The phone company may issue a trouble ticket if the servicing central office attempts to land a call on an un- powered or un-connected DID trunk. The central office switch may recognize this failure condition and take the un- powered or un-connected trunk out-of-service and attempt to land the same call on another trunk if available. If no other DID trunk is available in the hunt-group, an all circuits busy (fast busy tone) signal will be issued towards the caller.

POLARITY

Under Normal Battery Conditions:

• Tip Is Positive And At Ground Potential (tiP = Positive)

• Ring Is Negative And At -48 Vdc Potential (riNg = Negative)

FIELD INFO

A DID number is still just a 10 digit telephone number. Order at least two DID trunks for your PBX/VMS. A block of DID numbers is equivalent to a set of voice mailboxes. DID digits are the last digits ofthe telephone number out pulsed on the DID trunk. DID operates like Plain-Old-Telephone-Service with its roles reversed. Normally you go off-hook and dial the number you want to reach. During direct-inward-dialing operation the central office goes off-hook and dials up the CPE equipment For the telephone answering service: get two fines per operator: one to talk and one to hold. Allow for about 25 active accounts per trunk. For a start-up VMS service, at least 2 DID trunks are needed. If the DID trunks return a busy tone try reversing the tip and ring leads or add more did trunks.

ADDRESSING CAPACITIES

The number of telephones, extensions, stations, VMS clients, and/or Fax boxes depends on the number of DID digits out-pulsed by the Telephone Company:

3 DID digits can address 1,000 Stations

4 DID digits can address 10,000 Stations

5 DID digits can address 100,000 Stations

6 DID digits can address 1,000,000 Stations

7 DID digits can address 8,000,000 Stations

DIGIT OUT-PULSE SCHEME

According to the North American Numbering Plan (NANP):

• l-(651) NXX-lyyy DID = yyy 3 Digits Out-Pulsed

• l-(651) NXX-yyyy Dtt> = y yy 4 Digits Out-Pulsed

• H651) NXy-yyyy DΠ> = yyyyy 5 Digits Out-Pulsed

• l-(651) Nyy-yyyy DΠ> = yyyyyy 6 Digits Out-Pulsed

• l-(651) yyy-yyyy , DID = yyyyyyy 7 Digits Out-Pulsed f L e XiBle Com pu ter Teleph on y In terfa ce Solu tion s 61 CTPX

SPECIAL TRUNK SERVICE

DID TRUNKS WITH CALL TRANSFER CAPABILITY

Some telephone companies offer direct inward dialing trunks that return secondaiy dial tone or stutter dial tone when flashed normal battery after the call has been established. Check with the local Telephone Company for availability of this service.

DID TRUNKS WITH OUT-DIAL CAPABILITY

Some telephone companies offer direct inward dialing trunks that allow the Customer Premise Equipment to initiate an out-bound call. This trunk service may also include call transfer capabilities. Check with the local Telephone Company for availability of this service

TWO-WAY DID TRUNKS

Some telephone companies offer direct inward dialing trunks using an E&M interface. This trunk allows the Customer Premise Equipment to initiate out-bound calls and transfer calls. After a single hook-flash the caller gets placed on hold at the Central Office (CO) and the CO issues secondary or stutter dial tone. After detecting the secondary dial tone the CPE may dial a telephone number and perform a blind transfer by simply hanging up, or hook-flash between both calls to inform the initial caller about the secondary call progress. Conference calls may be supported with a double hook-flash. The Telephone Company may bring this service into the customer premise via an E&M interface. Check with the local Telephone Company for availability of this service.

fL eXiBle Comp uter Teleph ony In terfa ce Solu tio ns 62 CTPX

E&M INFORMATION

E&M BASICS

There are two different transmission types associated with E&M signaling:

• Two- ire Voice Transmission (transmit and receive talk path on the same wire pair)

• Four- Wire Voice Transmission (transmit and receive talk path on separate wire pairs)

There are two sides to an E&M interface circuit:

• E&M (Originates a call on the E-Lead)

• PLR (Originates a call on the M-Lead)

There are five different E&M signalmg types:

Type I Type H Type HI Type IV Type V

There is one information carrying lead in each direction:

• E-Lead

• M-Lead

The signaling leads carry status information from the local side to the remote side ofthe interface:

• On-Hook (un-seized)

• Off-Hook (seized)

The lead status information is transmitted as a single bit with the following states:

• idle

• active

The following signaling information can be transmitted using E&M signaling interface:

• Seize (local off-hook)

• Wink, Dial-Pulse, Flash (signaling information)

• Answer (remote off-hook)

• Disconnect (remote on-hook)

• Un-seize (local on-hook)

The wiring connection is always as following:

• E-Lead from the local interface to the E-lead of the remote interface

• M-lead from the local interface to the M-lead of the remote interf ce

Type II, ITI, and IV signaling have additional power leads associated with them:

• SG-Lead (Signal Ground)

• SB-Lead (Signal Batteiy) fL e XiBle Com pu ter Telep h ony In te r fa c e Solu tion s 63 CTPX

COMPARISON OF E&M TYPES

E&M signaling is used within the confines of a room or building. The signaling leads do not exit the protection of the building. E&M signaling leads are not designed for use in the "outside wiring plant."

Here is an attempt at providing a simple comparison between the different E&M interface types.

TYPE I

This interface is the original E&M interface arrangement.

Both sides ofthe interface are different.

Single lead wiring arrangement using E to E and M to M connections.

Requires a common ground or return path through frame or power ground.

Only one side ofthe interface provides -48 Vdc power.

This type is very common in North America.

TYPE II

This interface is a looped E&M arrangement eliminating deficiencies of type I signaling.

Both sides ofthe interface are different.

Dual lead wiring arrangement using E to E, M to M, SG to SG and SB to SB connections

Does not require a common ground or return path.

Both sides ofthe interface provide their own isolated power.

This type is common in North America.

TYPE m

This is a four leaded modification ofthe type I interface with complete separation ofthe power supplies.

Both sides ofthe interface are different.

Multi lead wiring arrangement using E to E, M to M, SG to SG and SB to SB connections

Requires a common ground or return path through frame or power ground for the E-lead.

Only one side ofthe interface provides -48 Vdc power.

TYPE ΓV

This interface is a looped E&M arrangement eliminating the deficiencies of type II signaling.

Both sides ofthe interface are alike.

Multi lead wiring arrangement using E to E, M to M, SG to SG and SB to SB connections

Requires no common ground or return path

Both sides ofthe interface provide their own isolated power.

TYPE V

This interface is the counterpart ofthe type I signaling arrangement.

Both sides ofthe interface are alike.

Single lead wiring arrangement using E to E, M to M connections

Requires a common ground or return path through frame or power ground for both leads.

Both sides ofthe interface provide their own power.

This type is common in Europe and other parts ofthe world.

f L eXiBle Compu ter Telepho n y I n ter fa ce Solu tions 64 CTPX

GLARE

GLARE CONDITIONS

Glare is encountered on two-way trunks when both sides ofthe interface attempt to ^ake control ofthe trunk or line at virtually the same time with neither side backing-out. The resulting condition is a stalemate that renders the trunk or line out-of-service.

GLARE RESOLUTION

Glare resolution is the successful re-negotiation of a glare condition. If a glare condition has been detected then the interface port that is given priority releases the trunk and the automatic switching equipment retries the call on another trunk. The successful negotiation between the two interface ports to solve this problem is called glare resolution. Automatic glare resolution is possible on trunks with wink-start and delay-dial operation. Automatic glare resolution is not available for trunks with immediate-start operation.

GLARE SPECIFICATIONS

fL eXiBle Com p uter Te lep h ony In terfa ce Solu tion s 65 CTPX

PBX LOSS PLAN

TRUNK DESIGNATION

ANALOG PORT OPERATION

fLeXiBle Computer Telephony Interface Solutions 66 CTPX

TUTORIAL

DID

Direct Inward Dialing "DID" is a feature provided by the local Phone Company. The servicing Central Office (CO) commonly issues DID numbers in "Blocks" of 25 (e.g. 555-1000 to 555-1024). Usually the last 3 or 4 "Digits" of the phone number are out-pulsed by the CO to the Customer Premise Equipment (CPE), but the phone company can configure the CO switch differently if the application requires it. The DID "Address" are the last digits ofthe phone number dialed. A call routed to a DID trunk sends the dialed number either via rotaiy Dial-Pulse (DP) digits or via Dual-Tone-Multi- Frequency (DTMF) tones depending on how the DID trunks are ordered. The connection is called a trunk because it hooks-up two pieces of automatic switching equipment (CO and PBX or Fax Server). There are three different DID trunk "Start-modes" available: Immediate-Start, Wink-Start, and Delay-Dial. The start-mode defines how the addressing digits are sent to the CPE. Delay-Dial is rarely used. Immediate-start with dial-pulse addressing is common but is a slower and less reliable method of transferring digits. Wink-Start combined with DTMF addressing is the most modern and provides the fastest and most reliable DID trunk operation. When ordering more than one DID trunk, the phone company arranges the trunks in single "Hunt-group." The method of hunting defines how new incoming calls are distributed across the available DID trunks. The best hunt group arrangement for DID trunks is circular (a.k.a. rotational hunting) because the Fax server port activity screen provides an easy point to spot out-of-service trunks. One of the major differences between DID trunks and regular Loop-Start phone lines lies in who powers the "phone line." Loop-start lines get power from the local CO but DID trunks get power from the Customer Premise Equipment (CPE). Therefore, it is good practice, to provide an un-interruptible power supply (UPS) with integral telecom surge suppression to DID-based equipment.

E&M

E&M signaling is an interfacing method supported by most Private Branch Exchanges (PBX) or phone systems. This interface is most often used to connect or "Tie" two PBX's or phone systems together to make them function as one unit, even though they are physically separated. In this case the PBX can be configured to forward all incoming Fax calls to its E&M ports. Usually the last 3 or 4 "Digits" of the phone number are out-pulsed in DTMF by the E&M port to the attached equipment, but the PBX can be configured differently if the application requires it. The E&M "Address" are the last digits of the phone number dialed. The connection is called a trunk because it hooks-up two pieces of automatic switching equipment (PBX and Fax Server). The preferred "Start-mode" here is Wink-Start because it provides glare detection. In this mode VP_2000.E&M provides automatic glare resolution. When configuring E&M ports, the PBX arranges the trunks in a single "Hunt-group." There are two choices of E&M transmission: Two-wire and Four-wire. There are five choices of E&M signaling: Type I, II IE IV, and V. There are two choices of E&M call origination: Originate on the E-lead or Originate on the M-lead. The VP_2000.E&M interface supports the following: Two-wire, E&M type I originate on E-lead. The E and M leads provide the port activity status for each signaling direction. Always connect E to E and M to M and hook-up a common ground wire between the two connected E&M ports. E&M leads are not designed to leave the building. Remember, to use un-interruptible power supply (UPS) with integral telecom surge suppression to protect valuable equipment

f L e XiBle Co m puter Te leph ony In te rfa ce S olution s 67 CTPX

SIGNALING FACILITIES

The North American local telephone and long distance carrier companies use different facilities to communicate between Central Office to Central Office and Central Office to Customer Premise.

ANALOG FACILITIES

CTPX1001 supports the following common facility interfaces:

• 2-Wire Loop

• 2-Wire E&M

• 4-Wire E&M

CTPX1001 does not support the following special facility interfaces:

• 2-Wire Duplex (DX)

• 4-Wire Duplex (DX)

• 4-Wire Single Frequency (SF)

DIGITAL FACILITIES

In North America and Europe TI and El trunks can cany A-, B-, C-, and D-bits for signaling purposes. To date, there is no standard signaling protocol that uses more than the A- and B-bits for signaling. The C- and D- bits are present but they are not used. In North America they are set equal to A- and B-bits respectively. In Europe they are set to a fixed value. When only A-bit signaUng is used, then all four bits are tied together.

BELLCORE

• TI North American Transmission Carrier Level 1 also known as DS 1

• PRI Primary Rate Integrated Services Digital Network

• BRI Basic Rate Integrated Services Digital Network

CCΓTT (ITU)

• El European Transmission Carrier Level 1 also known as PCM30

• PRI Primary Rate Integrated Services Digital Network

• BRI Basic Rate Integrated Services Digital Network

On a digital facility both interface sides arc the same, the only electrical difference between ports is transmit and receive. The local transmit port connects to the remote receive port and vice versa.

f L eXiBle Com puter Teleph ony In terfa ce S olutions 68 CTPX

TECHNICAL TIPS

Here are some technical tips that may assist with installing and troubleshooting:

AVOIDING GLARE

When two pieces of automatic switching equipment are connected with a two-way trunk or line, it is quite possible to experience locked-up trunks or stuck lines. This condition is called "glare." Glare happens when both sides of the interface attempt to take control of the trunk at the same time with neither side backing-out. The successful negotiation between the ports to solve this problem is called glare resolution. Two interfaces provide for glare resolution:

• Interface with Ground-Start supervision

• Interface with E&M supervision

The Interface with loop-reverse-battery supervision (DID trunks) is for one-way call traffic only. The DID inbound trunks can be complemented with loop-start lines that are dedicated for out-bound traffic only. Thus glare will never occur in this kind of trunking arrangement.

ORDERING DID TRUNKS

When ordering DID trunks, the local Telephone Company will ask for the following:

• Number of Trunks: Order at least two trunks to get started.

• Blocks of Numbers: Usually one block consists of 20 numbers. (NXX-lOOO to NXX-1019)

• Start Mode: Wink-start is most modern and reliable as opposed to immediate-start.

• Dialing Mode: DTMF (touch-tone) is the fastest, Dial Pulse (Rotary) is the slowest method.

• Number of Digits: Three to seven digits are possible but four digits are most common.

• Hunt Group: Circular hunting is prefened. Avoid sequential hunting.

BUSYING OUT DID TRUNKS

When working on DID trunks from time to time for maintenance purposes it may be necessary to prevent a particular trunk from accepting calls from the central office. In this case a simple tip and ring reversal on the trunk informs the central office of an intentional busy out condition. Most central offices will not land calls on DID trunks that are reverse powered.

CHECKING THE TELECOM FUSE

There are 48 surface mount fuses located right behind the RJ-21X 50-pin telecom connector. The fuses can be checked with an ordinary multi meter or continuity beeper. Set the multi meter to the low resistance range:

• If the measured fuse resistance is less then 1 Ohm then the fuse is ok.

• If the measured fuse resistance is much greater then 1 Ohm then the fuse is blown

It takes quite a bit of instant energy to blow the 1 A-telecom fuse. Lightning effects or power line crossings over to the telephone wiring can cause the fuse to blow.

PROTECTING FROM POWER SURGES

Simply having an un-interruptible Power Supply (UPS) and a couple of surge protectors is no guarantee that they are going to perform their duty reliably. Ideally the telecom surge protector and the power line surge protector are one integral unit. If that is not the case, they must at least share the same common ground. The UPS eases the stress on the computer hard-drive and keeps the DID trunks alive in case of power outages. There are multiple reasons for power surges:

• Power line transients or spikes caused by lightning effects

• Power line crosses over to telephone wiring accidentally

• Telephone line transients or spikes caused by lightning effects fL eXiBle Compu te r Telepho n y I n terfa ce So lu tio n s 59 CTPX

MEASUREMENTS

When measuring telephony voltage knowledge of loop parameters and the equivalent port and circuit diagrams are reqmred in order to make sense of the measured voltage values. Avoid tip to ground and πng to ground voltage measurements. Due to the effect of loop and wiring resistance, the voltages measured across tip and ring at the local port compared to the voltage measured across tip and ring at the remote port can be substantially different Measuring telephony currents and their interpretation is somewhat simpler. Generally currents over 16mA indicate a seized trunk or off-hook state Take extreme care when performing voltage and current measurements.

DC PARAMETERS

DC Voltage Range 433 Vdc to 52.8 Vdc DC Current Range 000 mAdc to 50.0 mAdc DC Resistance On-Hook 30, 000 Ohms minimum DC Resistance Off-Hook 200 Ohms maximum DC Resistance Battery Feed 400 Ohms nominal DC Resistance Loop Tip 900 Ohms maximum DC Resistance Loop Ring 900 Ohms maximum DC Resistance Loop Total 2,400 Ohms maximum

T&R LEADS a) What is the on-hook voltage across the tip lead and ring lead? Should be between 43.3 Vdc and 52.8 Vdc b) What is the off-hook voltage across the tip lead and ring lead? Should be between 3 20 Vdc and 45 0 Vdc c) What is the on-hook polarity across the tip and ring lead? Should be normal d) What is the polarity across the tip and πng lead before answer? Should be normal e) What is the polarity across the tip and πng lead after answer? Either normal or reversed (DID) f) What is the on-hook current in the tip lead? Should be around 00 mAdc g) What is the off-hook current in the tip lead? Anywhere between 16 mAdc to 50 mAdc h) What is the on-hook current in the ring lead? Should be around 0.0 mAdc i) What is the off-hook current in the ring lead? Anywhere between 16 mAdc to 50 mAdc j) Is there any AC voltage across the tip lead and the ring lead? Should be 0.00 Vac k) Is there any AC voltage across the tip lead and ground? May be present but must be equal to 1) 1) Is there any AC voltage across the ring lead and ground? May be present but must be equal to k)

E&M LEADS

A) What is the voltage across the idle E-lead and ground? Should be near -48 0 Vdc

B) What is the voltage across the active E-lead and ground? Should be near 0.0 Vdc

C) What is the voltage across the idle M-lead and ground? Should be near 0.0 Vdc

D) What is the voltage across the active M-lead and ground? Should be near -48.0 Vdc

E) Is there any AC voltage across the E-lead and ground? There should be none

F) Is there any AC voltage across the M-lead and ground? There should be none

SG & SB LEADS

I) What is the voltage across the SG-lead and ground? Should be near 0 0 Vdc

II) What is the voltage across the SG-lead and battery? Should be near -48.0 Vdc

HI) What is the voltage across the SB-lead and battery? Should be near 0 0 Vdc IV) What is the voltage across the SB-lead and ground? Should be near -48.0 Vdc f L e XiB le Com pu ter Te lephon y I n te rfa ce Solu tio n s 70 CTPX

ABBREVIATIONS

AC Alternating Current MISO Master Input Serial Output

ATB All-Tninks-Busy MOSI Master Output Serial Input

MVIP Multi Vendor Interface Protocol

BBG Basic Business Group

BCLK Bit Clock: NANP North American Numbering Plan

BRI Basic Rate ISDN NBR Number

NXX Central Oflicepre-fix (N = 2 to 9 and X = 0 to 9) c Celsius

CAS Channel Associated Signaling PCB Printed Circuit Board

CO Central Office PCM Pulse Code Modulation

CPE Customer Premise Equipment PCM30 Pulse Code Modulation with 30 channels (ITU)

PE Protective Earth

DAA Data Access Arrangement PLR Pulse Link Repeater

DC Direct Current PRI Primary Rate ISDN

DD) Direct Inward Dialing PSTN Public Switched Telecom Network

DIP Dual-In-Line Package POTS Plain-Old-Telephone-Service

DP Dial Pulse

DPO Dial Pulse Originating R Ring Lead

DPT Dial Pulse Terminating RCV Receive

DSI Digital Signal Input REN Ringer Equivalence Number

DSO Digital Signal Output RFI Radio Frequency Interference

DSI Digital Signal Level 1 RJ Registered Jack

DTMF Dual Tone Multi Frequency RMA Return Material Authorization

DX Duplex Signaling RST Reset

E E-lead SB Signal Battery lead

E&M Ear and Mouth ;-) SF Single Frequency Signaling

E/M E and M lead SG Signal Ground lead

El European Digital Signal Level 1 SIP Single-Li-Line Package

ESD Electrostatic Discharge SOC Service Order Code

ETO Equalized Transmission Only SXI Simplex Input

SXO Simplex Output

F Fahrenheit

FAX Facsimile T Tip lead

FCC Federal Communications Commission T/R Tip and Ring leads

FDX Full Duplex TI Basic PCM Transmission with 1.544 Mbps

FIC Facility Interface Code TELCO Telephone Company

EXO Foreign Exchange Office TO Transmission Only

FXS Foreign Exchange Subscriber TRC Telecom Reference Conductor

GND Ground USOC User Order Code

GS Ground-Start

Vac Voltage of Alternating Current

IS Immediate-Start Vdc Voltage of Direct Current

ISDN Integrated Services Digital Network VDD Voltage Drain to Dram

ITU International Telecommunications Union VMS Voice Messaging System

Vrms Voltage root mean square

LS Loop-Start

WS Wink-Start

M Mlead MF Multi Frequency XMT Transmit

fL e XiBle Co puter Telep h ony In te rfa ce Solu tion s 71 CTPX

GLOSSARY

Addressing

Signaling state used to convey destination information. Four addressing methods are common: Dial-Pulse (DP), Dual-Tone-Multi-Frequency (DTMF), Multi-Frequency (MF), and Single- Frequency (SF).

Alerting

Signaling state used to indicate the presence of an incoming call. It consists of an AC ringing signal that is periodically interrupted by silent intervals (no ringing signal).

Amplifying

Increase of signal level resulting in transmission gain.

Analog Signal

An Analog signal is a continuous time signal of continuously varying amplitude.

Analog-to-Digital Converter

An A/D is a device that converts an analog signal into a digital signal.

Analog Telephony

Analog telephony is referring to interfaces with, LOOP, E&M, SF and DS signaling.

Answer

Off-hook signal transmitted when the called destination answers.

Battery

The -48 Vdc terminal connected to negative voltage potential.

Battery Feed

Power source for a specific telephone trunk or line.

Break

Break is a part of a dial-pulse digit. During dial pulsing, short on-hook intervals, called breaks interrupt the DC current flow.

Busy

Busy is the condition of a line or trunk resulting in the inability to complete an incoming call because the line or trunk is in use or in trouble.

Busy Out

Trunks or lines can be busied out in order to prevent them from landing calls on the port. This is done by intentionally forcing the port to a permanent off-hook condition.

Busy Tone

Audible signal indicating a call cannot be completed because the called line is busy.

Call

Exchange of messages or information by telephone.

Call Processing

Call processing is the sequence of events performed by a switch after the call has landed on one of its trunks till the final station destination answers the call.

Call Progress tones

Call progress tones are voice band signals and announcements used to inform the caller of the condition or state of a call. They co er the interval from the end of dialing to answer by the called station or abandonment of the call attempt

Central Office

The building where Telephone Company switching equipment is housed and lines and trunks are terminated.

Channel

Channel is a transmission path between two points.

Channel Bank

Equipment used to multiplex channels onto a transmission carrier.

Character

Single specific number, letter, or symbol used to designate a dialable signal.

Chassis

Housing for electronic equipment.

Closed

Low Resistance State between hook-switch contacts.

Computer Telephony

Referring to the merging of computer and telephony technology.

Configuration

Configuration is the composition of hardware, software, and facilities to implement a system.

Connection f L e XiBle Comp u ter Te lephon y In terfa ce Solu tion s 72 CTPX

Connection is a two way voice band circuit between two points established by connecting two or more switching devices

Customer Premise Equipment

Equipment connected to public switched telephone network located at customer location Delay-Dial

Delay-dial is a part of the address signalmg sequence based on the ability of two pieces of automatic switching equipment to respond to a trunk seizure within a defined manner This start mode is similar to the wink-start operation After a trunk seizure the other side returns the off- hook condition while idle. The off-hook signal remains until the port is ready to process addressing digits

Dial Pulse

A dial-pulse is a change m the direct current of a signalmg lead to provide address information.

Dial Pulse Signaling

Method of transmitting address information using a sequence of alternating break (on-hook) and make (off-hook) signals The number of break intervals in a dial-pulse tram equals the numerical value of the dialed digit. Ten break intervals represent the digits zero A long make interval indicates an interdigital interval.

Digital Milliwatt

The repetitive transmission of a specific digital sequence of codes m a given channel will be decoded by a properly aligned CODEC as a 0 dB O, 1 kHz signal

Digital Signal

Non tune continuous signal consisting of two states. Digital Telephony

Referring to transmission earner and ISDN interfaces Digital-to-Analog Converter

A D/A is a device that converts a digital signal into an analog signal Direct-Inward-Dialing

DID is a feature that allows callers direct access to a station on the switching system without attendant assistance Typically the last digits of a caller's telephone number are transmitted for direct connection to the called party's telephone extension, voicemail or FAX mailbox

Disconnect

Disconnect is an on-hook signal that persists beyond a prescribed limit A disconnect can last ^definitely.

Dual Tone Multi Frequency

DTMF or TOUCH-TONE is a tone signalmg method of transmitting address and other information where a set of dual-tone pulses is used to represent a corresponding set of characters Each DTMF pulse consists of two components: one component from a group of four high- frequency tones and another component from a group of four high-frequency tones. There are sixteen combinations of which 12 are accessible to the public.

E-Lead

This is the wire that is connected to the E terminal ofthe E&M signaling device

Federal Communications Commission

FCC is a government agency regulating all domestic use of communications

Flash

The flash is a short, on-hook interval during the off-hook period of a call. A flash mdicates a desire to recall a service function or to activate a custom-calling feature.

Four- Wire Circuit

Arrangement of wires where one pair is for transmitting and another is for receiving

Full Duplex Transmission

Full duplex is a method of simultaneous bi-directional communication

Glare

Glare is the condition when both sides of a two-way trunk attempt to take control of the circuit at the same time. The result is a stalemate condition that renders the trunk out-of-service.

Glare Resolution

Glare resolution is the successful re-negotiation of a glare condition. Usually one side of the mterface is given priority

Ground

The positive battery terminal that is connected to earth ground potential

Ground-Start Supervision

Form of signalmg and mterface in which grounding a wire mdicates a request for service by either side

Hybrid

Hybrid is an electronic telephony circuit that provides 2-wire to 4-wire conversion. f L e XiBle Com pute r Telep hony In terfa ce Solu tions 73 CTPX

Immediate-Start

Immediate-start is a part of the address signalmg sequence based on the ability of two pieces of automatic switching equipment to respond to a trunk seizure within a timely manner This start mode is often associated with dial-pulse addressing Digit mutilation may occur

Interface

Interface is the point of interconnection between terminal equipment and communications facilities The boundary is defined by physical and electrical interconnection requirements

Lme is a transmission path between station equipment and the telephone network

Local

Referring to (he near end ofthe trunk or lme

Local Loop

The Local loop is the connection between the subscriber and the central office

Loop

The contact closure to allow current flow

Loop-Reverse-Battery Supervision

Form of signaling and mterface m which loop open and close is used to mdicate on-hook and off- hook states in one direction, normal and reversed battery polarity is used to mdicate dle and busy states m the opposite direction.

Loop Side

Portion ofthe switching system that interfaces with local loops

Loop-Start Supervision

Form of signaling and mterface in which the end office supplies battery between tip and πng conductors and a terminal mdicates an off-hook state by allowing current to flow

M-Lead

This is the wire that is connected to the M terminal ofthe E&M signaling device

Multi Frequency Signaling

MF is atone signaling method of transmitting address and other information where a set of dual- tone pulses is used to represent a corresponding set of characters Each MF pulse consists of two components chosen from a set of six frequencies

Network Interface

Point of demarcation between public switched telephone network and customer premise equipment

Normal Battery

The tip is at positive potential and ring is at negative potential Off-Hook

Off-hook is the active, in-use, or request-for-semce state in which the hook-switch contact is closed resulting in the flow of DC current

On-Hook

On-hook is the idle, quiescent or inactive state in which the hook-switch contact is open resulting in the absence of DC current

Open

High resistance state between hook-switch contacts

Phone

Short form of telephone

Plain-Old-Telephone-Service

Plain-Old-Telephone-Service is the basic single line telephone service

Power Denial

A port can be powered down by shutting off its power and drive amplifier.

Private Branch Exchange

PBX is a pnvate switching system, either manual or automatic, usually located on a customer's premise

Radio Frequency Interference

RFI is noise interference in the radio spectrum.

Reliability

Reliability is the likelihood of trouble-free performance

Remote

Referring to the far end ofthe trunk or lme

Reverse Battery

The tip is at negative potential and the πng is at positive potential

Ring

One ofthe two conductors associated with a two-wire mterface

Ringing Signal fL e XiBle Com u ter Teleph ony In te rfa ce Solution s 74 CTPX

The high voltage sinusoidal alternating current representing the alerting signal

Seizure

Seizure is the action of taking control of a circuit

Signaling

Signalmg is the generation and transferring of information between the two sides of an mterface

Station

Single addressable telephone device ι

Station Equipment

Station eqmpment is user accessible telephone apparatus and associated equipment

Station Side

Station side is the portion ofthe switching system that interfaces with stations

Subscπber

Subscriber is a user of telephone company service

Supervision

Supervision is the constant monitoring and detection of the state of a call or trunk condition

Supervisory Signals

Signals used to mdicate or control the states of circuits involved m a particular connection A supervisory signal mdicates to equipment, to an operator, or to a caller that a particular state m a call has been reached and may signify the need for action to be taken

Switch

Switch is the informal descπption for a PBX or a central office Switching

Switching is the connection and disconnection of appropnate lmes and trunks Switching System

This is equipment capable of establishing connections on demand between selected pairs of voice band circuits

Telco

Telco is the informal short form of Telephone Company or local central office Telecommunication

Telecommunication is the electromagnetic transmission and reception of information carrying electncal signals

Telephone

A telephone is an apparatus for the transmission of speech Telephony

Telephony is a method for transmission of speech Tuning

The differentiation between hit, breaks, make, wink, flash, disconnect and permanent signals based on their duration.

Tip

One ofthe two conductors associated with a two-wire mterface

Tip/Ring Lead Reversal

In order to correct an external tip and πng lead wiπng error the leads may be reversed by the port

Transmission

Transmission is the transporting of information from one pomt to another

Trouble

Trouble is a bad exception from the ordinary

Trunk

Telephone path connecting two switching systems

Trunk Side

Trunk side is the portion ofthe switching system that interfaces with trunks

Two-Way Trunk

Two-way trunk is a telephone circuit that can be seized at either end

Two-Wire Circuit

Arrangement of wires where one pair is used for transmitting and the other parr for receiving signals

Voice Messaging System

A device for creating, storing, and delivering messages in voice form

Wink

The wink is a short, off-hook interval during the On-hook State of a call

Wink-Start

Wink-start is a part of the address signaling sequence based on hand shaking between the two pieces of automatic switching equipment A trunk seizure on one side is followed by an indication from the other side regarding the readiness to receive address information. f L eXiBle Com p uter Teleph ony In te rfa ce S oluti on s 75 CTPX

OPPOSITES

Absorb Reflect

Active Passive

Ac Dc

Amplifier Attenuator

Analog Digital

Analysis Synthesis

Antinome Synonym

Appendix Prefix

Apply Remove

Ascend Descend

Attach Release

Attenuate Boost

Block Queue

Break Make

Busy Idle

Called Party Calling Party

Capacitor Inductor

Central Office Private Branch Exchange

Chaotic Sequential

Closed Open

Collect Return

Complex Simple

Condition Event

Conductor Isolator

Connect Disconnect

Customer Premise Equipment Public Switched Telephone Network

Decay Growth

Decode Encode

Decryption Enciyption

Demodulation Modulation

Demultiplexer Multiplexer

Demux Mux

Detector Emitter

Direct Inward Dialing Direct Outward Dialing

Dissolve Establish

Down Up

Dumb Smart

Duplex Simplex

Dynamic Static

E-Lead M-Lead

Enter Exit

Equipment Side Switch Side

Fall Rise

Far End Near End

Finish Start

Forward Reverse

Gain Loss f L eXiBle Com pute r Telephon y In terfa ce Solu tion 76 CTPX

Generator Load

High Low Host Terminal

In Out

In-Bound Out-Bound

Input Output

Lead Trail

Leading Trailing

Line Trunk

Line Interface Phone Interface

Mark Space

Negative Positive

Network Station

Noise Signal

Normal Reverse

Obsolete State-of-the-Art

Off On

Off-Hook On-Hook

Open Short

Originate Terminate

Originating End Receiving End

Parallel Serial

Periodic Random

Power Down Power-Up

Range Value

Receive Transmit

Receiver Transmitter

Reception Transmission

Return Send

Ring Lead Tip Lead

Seize Un-Seize

Sensor Transducer

Station Side Trunk Side

Start Stop

Steady Transient

Strong Weak

fL eXiBle Co pu ter Teleph on y I n te rfa ce Solu tion s 77 CTPX

SUPPORT

Product support can be reached through multiple communication methods:

• by telephone

• by Fax

APPLICATION SUPPORT

Applications personnel usually before the sale provide application support

SALES SUPPORT

Sales personnel mostly during the sale provide sales support.

SERVICE SUPPORT

Customer service personnel provide service support commonly after the sale.

TECHNICAL SUPPORT

Engineering personnel before and after the sale provide technical support.

RETURNS

Reasons for product returns:

• Return for Credit

• Return for Refund

• Return for Repair

RETURN MATERIAL AUTHORIZATION

Authorization prior to returning product is required. Call for an RMA number before sending any returns. Returns without an RMA number will not be accepted. The RMA number must be prominently displayed on the shipping label. All products will be returned to customers in the same timely manner as they are received

fL e XiBle Com p uter Teleph ony Interfa ce S olutions 78 CTPX

WARRANTY

2 YEAR LIMITED PRODUCT WARRANTY

The CTPX Telecommunications, Inc CTPX1001 Field Programmable Telephony interface Module is warranted to the original purchaser to be free of defects in material and workmanship for a period of two (2) years from the date of purchase.

Should CTPX1001 fail to operate as specified at any time during the warranty period, CTPX Telecommunications, Inc. will either repair or replace the product free of charge for parts and labor and return it to the customer, freight prepaid, within the United States.

Modules not found to be defective will be returned at purchaser's expense and will include cost of testing, handling, and shipping.

This limited warranty does not include repairs due to, abuse, misuse, accident, or natural causes such as fire, floods, hurricanes, lightning, tornadoes, or other such catastrophes. Damages caused by environmental hazards such as power surges or power transients, telecom surges or transients, or modifications and repairs done by unauthorized personnel are not covered under this limited warranty.

A CTPX1001 requiring limited warranty service during the warranty period should be delivered to CTPX Telecommunications, Inc. with proof of purchase. If delivery is by mail or any other deliver carrier, the sender must insure the module or assume the risk of loss or damage during shipment. CTPX Telecommunications, Inc. only accepts modules for repair that have pre-paid shipping charges.

No credit will be given for repairs performed by unauthorized personnel LIMITATION

All express and implied warranties for this product including, but not limited to, the warranties of merchantability and fitness for a particular purpose are limited in duration to the above two year period.

LIMITATION

Under no circumstances will CTPX Telecommunications, Inc. be liable in any way to the user for damages including any lost profits, lost savings or other incidental or consequential damages arising out of the use of, or inability to use, this product.

fL e XiBle Com puter Te lep h on y In te rfa ce Solution s 79 CTPX

SERVICE

In the event of a product malfunction, CTPX Telecommunications, Inc. or an authorized agent should perform all repairs. It is the responsibility of users requiπng service to report the need for service to CTPX Telecommunications, Inc. or to one of our authorized agents. l

HARDWARE REPAIRS

Module repairs not covered under warranty are based on a flat fee charge for parts and labor. Please consult with CTPX Telecommunications, Inc. for the up-to-date repair charge.

FIRMWARE UPGRADES

Firmware upgrades are based on a license fee charge. Please consult with CTPX Telecommunications, Inc. for the up-to-date upgrade charge.

TECH SUPPORT

For 24-hour technical support, call CTPX Teleco munications, Inc. and ask for tech support.

CONTACT ADDRESS

Service can be obtained at:

f L eXiBle Comp uter Teleph ony In te rfa ce S olutions 80 CTPX

Telecommunications, Inc. 90i Jefferson Avenue #301

Saint Paul, Minnesota 55102

Telephone: (651) 293-0535

Facsimile: (651) 225-4533 www.ctpx.com

Patent Pending

Field Programmable Telephony Interface Module

Programmers Guide

PRELIMINARY

Printed: 08/09/2000 12:27:04 PM

fL eXiBle Computer Telephony In terface Solutions CTPX

© MM, CTPX Telecommunications, Inc All rights reserved

P/N: 103-0017A

Issue 1

2000

TRADEMARKS:

CTPX is a trademark of CTPX Telecommunications, Inc

CTPX1001 is a trademark of CTPX Telecommunications, Inc

FP-TiM is a trademark of CTPX Telecommunications, Inc φ All other products, services, and publications are trademarks or registered trademarks of their respective owners.

BELLCORE is a trademark of Bell Communications Research

FCC is a trademark of Federal Communications Commission

ITU is a trademark of International Telecommumcations Union

MVIP is a trademark of GO-MVP, Inc

SPI is a trademark of Motorola Corporation

ST-BUS is a trademark of Mitel Corporation

TOUCH-TONE is a trademark of AT&T

φ Information contained in this document is subject to change without notice!

f L eXiB le Comp u ter Te lephon y In terfa ce S o lu tio ns CTPX

TABLE OF CONTENTS

PORTS

PINS _, 7

REGISTERS 8

MODULE CONTROL REGISTER .....: 9

MCR Settings (Byte 1) o

SERIAL CONTROL REGISTER 10

SCR Settings (Byte 2) JO

PORT OPERATION REGISTER 11

POR Settings (Byte 2) U

TELEPHONY ERROR REGISTER 12

TER Settings (Byte 2) 12

MODULE TEST REGISTER 12

MTR Settings (Byte 2) 12

CAS BIT REGISTER 13

CBR Settings (Byte 2) 13

CAS MANIPULATION REGISTER 13

CMR Settings (Byte 2) 13

RECEIVE DECLARATION REGISTERS 14

RDR Settings (Byte 2) 14

TRANSMIT DECLARATION REGISTERS 14

TDR Settings (Byte 2) 14

INTERFACE SELECTION REGISTER 15

ISR Settings βyte 2) 15

RING PATTERN REGISTER 15

RPR Settings βyte 2) 15

RING FREQUENCY REGISTER 16

RFR Settings (Byte 2) 16

RING VOLTAGE REGISTER 17

RVR Settings (Byte 2) 17

TELECOM VOLTAGE REGISTER 18

TVR Settings βyte 2) 18

UPPER FREQUENCY REGISTER 19

UFR Settings βyte 2) :...' 19

LOWER FREQUENCY REGISTER 20

LFR Settings βyte 2) 20

CODEC CONTROL REGISTER. 21

CCR Settings βyte 2) 21

RECEIVE GAIN REGISTER _ 22

RGR Settings βyte 2) [0x00 to 0x3F] 23

RGR Settings βyte 2) [0x40 to OxlF 24

RGR Settings βyte 2) [0x80 to OxBFJ 25

RGR Settings βyte 2) [OxCO to OxFFJ 26

TRANSMIT GAIN REGISTER 27

TGR Settings βyte 2) [0x00 to 0x3F] 28

TGR Settings βyte 2) [0x40 to 0x7F] 29

TGR Settings βyte 2) [0x80 to OxBFJ 30

TGR Settings βyte 2) [OxCO to OxFFJ 31

HYBRID-BALANCE REGISTERS 32

HBR1 Settings βyte 2) '. 32

HBR2 Settings βyte 2) 32

HBR3 Settings βyte 2) ,. 32 fL eXiBle Com puter Teleph on y In terfa ce Solutions 3 CTPX

RECEIVE TTMESLOT REGISTER 33

RTR Settings βyte 2) 33

TRANSMIT TIME SLOT REGISTER 33

TTR Settings βyte 2) 33

SOLID STATE REGISTER 1 3

SSR1 Settings βyte 2) t 34

SOLID STATE REGISTER 2 34

SSR2 Settings βyte 2) 34

INTERFACE LATCH REGISTER 35

ILR Settings βyte 2) 35

LATCH DIRECTION REGISTER 35

LDR Settings βyte 2) '. 35

AUTONOMOUS FUNCTIONS 36

RING-GENERATION [ 36

RING-TRIP 37

RING-DETECTION 37

SIGNAL VALID ATION 38

INTERFACE TABLES 39

FXO-LS 39

FXO-RB 39

FXO-GS : 39

FXS-LS 40

FXS-RB : 40

FXS-GS 40

DPT 41

DPO 41

2-W. E&M I 42

SERVICE 48

HARDWARE REPAIRS 48

SOFTWARE UPGRADES 48

TECH SUPPORT 48

CONTACT ADDRESS 48 fL eXiBle Com pute r Telephon y In terfa ce Solu tio n s 4 CTPX

fLeXiBle Computer Telephony Interface Solutions CTPX

PORTS

• Analog

• Digital

• Control

• Power

+5VdC

fLeXiBle Co puter Telephony Interface Solutions CTPX

PINS

fLeXiBle Com uter Telephony Interface Solutions CTPX

REGISTERS

Control information and data are written into or read back from the module through the serial control ports. All control instructions require 2 bytes, except the power-up/power-down command, which requires only 1 byte. All programmable functions should be initially programmed while the device is powered down. Bit 7 of bytes 1 and 2 is always the first bit clocked into or out from the SDO/TXD and SDI/RXD pins. Other register address codes are invalid and may not be used.

Serial Control Register SCR (read/write)

Port Operation Register POR (read/write)

Telephony Error Register TER (read only/latched)

Module Test Register MTR (inactive)

CAS Bit Register CBR (read only)

CAS Manipulation Register CMR (read/write)

Receive Declaration Register RDR (read/write) Transmit Declaration Register TDR (read/write)

Interface Selection Register ISR (read/write)

Ring Pattern Register RPR (read/write)

Ring Frequency Register RFR (read/write)

Ring Voltage Register RVR (read/write)

Telecom Voltage Register TVR (read/write)

Upper Frequency Register UFR (read/write)

Lower Frequency Register LFR (read/write)

Codec Control Register CCR (read/write)

Interface Latch Register ILR (not user accessible)

Latch Direction Register LDR (not user accessible)

Receive Gain Register RGR (read write)

Transmit Gain Register TGR (read/write)

Hybrid Balance Register 1 HBR1 (read possible but write not recommended)

Hybrid Balance Register 2 HBR2 (read possible but write not recommended)

Hybrid Balance Register 3 HBR3 (read possible but write not recommended)

Receive Timeslot Register RTR (read/write)

Transmit Timeslot Register TTR (read/write)

fL eXiBle Com pu ter Telep h ony In te rfa ce Solutions CTPX

MODULE CONTROL REGISTER

The module control register provides direct read/write access to the specific module registers.

MCR Settings (Byte 1)

fLeXiBle Com uter Telephony Interface Solutions CTPX

SERIAL CONTROL REGISTER

SCR Settings (Byte 2)

UART Operation

Baud Rate 19.2kbps

Data Bits 8

Parity Bit none

Stop Bit 1

Maximum Character Read/Write 4 (2 x 2 Byte Nibbles)

Minimum Character Read/Write 2 (1 x 2 Byte Nibbles)

The following is an example of how to set the Telecom Voltage to approximately 60Vdc using the UART interface. This is accomplished by writing a OxOD to the Telecom Voltage Register (TVR) which is located at register address 0x2C:

1st character 2 first register address byte nibble 2nd character C second register address byte nibble 3rf character 0 first register data byte nibble 4th character D second register data byte nibble

SPI Operation

Maximum SPI Clock Speed : 2.048MHz

Minimum SPI Byte Spacing : 125us

The following is an example of how to set the Telecom Voltage to approximately 60Vdc using the SPI interface. This is accomplished by writing a OxOD to the Telecom Voltage Register (TVR) which is located at register address 0x2C: lrt Byte 2C register address byte 2nd Byte 0D register data byte

fL e XiBle C o mputer Teleph ony In terfa ce S olutions 10 CTPX

PORT OPERATION REGISTER

POR Settings (Byte 2)

The module power down state consist of taking the following components into their respective shut-down mode:

1. Micro Controller is in sleep mode.

2. Codec is in powered down mode.

3. Switch Mode Power Supply is turned off.

4. Solid State Relays are deactivated.

fLeXiBle Computer Telephony Interface Solutions 11 CTPX

TELEPHONY ERROR REGISTER

This register indicates possible receive eπor conditions. The following telephony eπors may occur:

No current present when current is supposed to be flowing

T and R lead reversal l

E and M lead reversal

Signaling lead open

Signaling lead shorted to other lead

Signaling lead shorted to ground

Signaling lead shorted to power

TER Settings (Byte 2)

Note: This is a latched register. This is a read only register. The new value is latched until the next register read resets the value back to "0".

MODULE TEST REGISTER

MTR Settings (Byte 2)

Note: This register is currently inactive.

f L eXiBle Comp u ter Te leph ony In terfa ce S olutions 12 CTPX

CAS BIT REGISTER

CBR Settings (Byte 2)

Note: This is a read only register.

CAS MANIPULATION REGISTER

CMR Settings (Byte 2)

fLeXiBle Computer Telephony Interface Solutions 13 CTPX

RECEIVE DECLARATION REGISTERS

RDR Settings (Byte 2)

TRANSMIT DECLARATION REGISTERS

fLeXiBle Com uter Telephony Interface Solutions 14 CTPX

INTERFACE SELECTION REGISTER

RING PATTERN REGISTER

RPR Settings (Byte 2)

fLeXiBle Computer Telephony Interface Solutions 15 CTPX

RING FREQUENCY REGISTER

fLeXiBle Co puter Telephony Interface Solutions 16 CTPX

RING VOLTAGE REGISTER

RVR Settings (Byte 2)

fLeXiBle Computer Telephony Interface Solutions 17 CTPX

TELECOM VOLTAGE REGISTER

TVR Settings (Byte 2)

fLeXiBle Co uter Telephony Interface Solutions 18 CTPX

UPPER FREQUENCY REGISTER

fLeXiBle Computer Telephony Interface Solutions 19 CTPX

LOWER FREQUENCY REGISTER

fLeXiBle Computer Telephony Interface Solutions 20 CTPX

CODEC CONTROL REGISTER

CCR Settings (Byte 2)

Note: State at power-up initialization (bit 4 = 0) Codin Law Conventions

Note: The MSB is always the first PCM bit shifted in or out

fLeXiBle Computer Telephony Interface Solutions 21 CTPX

RECEIVE GAIN REGISTER

fLeXiBle Computer Telephony Interface Solutions 22 CTPX

fLeXiBle Computer Telephony Interface Solutions 23 CTPX

fLeXiBle Co puter Telephony Interface Solutions 24 CTPX

Note: The 0 dB receive path gain setting is OxAE.

fLeXiBle Computer Telephony Interface Solutions 25 CTPX

Note: Receive path gain settings greater than 0xC3 are permitted; however, large signals may cause overload.

fLeXiBle Computer Telephony Interface Solutions 26 CTPX

TRANSMIT GAIN REGISTER

fLeXiBle Computer Telephony Inter fa£g_£alutions 27 CTPX

fLeXiBle Computer Telephony Interface Solutions 28 CTPX

fLeXiBle Co uter Telephony Interface Solutions 29 CTPX

Note: TheO dB transmit path gain setting is OxBF.

fLeXiBle Computer Telephony Interface Solutions 30 CTPX

Note: Transmit path gain settings greater than 0xC3 are permitted; however, large signals may cause overload

fLeXiBle Computer Telephony Interface Sol tions 31 CTPX

HYBRID-BALANCE REGISTERS

The Codec Hybrid-Balance Software Program from Lucent Technologies defines the correct settings for the Hybrid Balance Registers 1, 2, and 3. The settings are dependent on internal component parameters and the external termination impedance. Extensive knowledge of transmission theory and complex mathematics is required to run the program. t

HBR1 Settings (Byte 2)

HBR2 Settings (Byte 2)

HBR3 Settings (Byte 2)

f L eXiBle Com pu ter Te leph on y In terfa ce Solu tions 32 CTPX

RECEIVE TIMESLOT REGISTER

The Receive Timeslot Register byte 2 functions are identical to the Receive Timeslot Register byte 2 functions. The new timeslot assignment becomes active on the second frame following end of the CS for the second control byte.

RTR Settings (Byte 2)

Note: T5 is the MSB ofthe timeslot assignment

TRANSMIT TIME SLOT REGISTER

The Transmit Timeslot Register byte 2 functions are identical to the Receive Timeslot Register byte 2 functions. The new timeslot assignment becomes active on the second frame following end ofthe CS for the second control byte.

TTR Settings (Byte 2)

Note: T5 is the MSB ofthe timeslot assignment

f L eXiBle Comp u ter Teleph ony In terfa ce S o lu tions 33 CTPX

SOLID STATE REGISTER 1

The solid state relays are controlled with an active low signal. A low on the SSR control pin closes the contact.

SSR1 Settings (Byte 2)

Bit Number and Name

Function BC BT BR GC GT GR SBE SGE

Battery Closed Off Battery Closed On

Batteiy-On-Tip Off Battery-Qn-Tip On

Battery-On-Ring Off Battery-On-Ring On

Ground Closed Off Ground Closed On

Ground-On-Tip Off Ground-On-Tip On

Ground-On-Riπg Off Grouπd-Qπ-Riπg On

Signal Battery Enable Off Signal Battery Enable On

Signal Ground Enable Off Signal Ground Enable On

Note: This register is not user accessible!

SOLID STATE REGISTER 2

The opto couplers provide an active low signal output, Current flowing through the individual photo detector causes the phototransistor to issue low level on its collector output.

SSR2 Settings (Byte 2)

For Your Information

fL e XiBle Com puter Te leph ony In te rfa ce Solution s 34 CTPX

INTERFACE LATCH REGISTER

The ADJ and CTL bits control the output ofthe internal switch mode power supply.

ILR Settings (Byte 2)

Note: This register is not user accessible!

Note: The SMPS has a serially controlled internal S-bitDAC. The DAC can only be incremented one step at a time. The DAC has no direct user access.

LATCH DIRECTION REGISTER

Note: This register is not user accessible!

Write 00110000 to this register as initialization word. A logic "0" defines the pin as an input A logic "1" defines the pin as an output

f L e XiBle Com p uter Teleph ony In te f a ce S olutions 35 CTPX

AUTONOMOUS FUNCTIONS RING-GENERATION

Ring generation is required for FXS interface port operation.

1. The port is at its idle condition (TVR). 2. The port receives the command to ring issue a ring burst (RPR). 3. The port applies the Ring Pre-Trip Test for the duration of a half ring-cycle (RFR). 4. The port applies the Ring Negative Max Voltage (RVR) for the duration of a half ring-cycle (RFR). 5. The port applies the Ring Positive Max Voltage (RVR) for the duration of a half ring-cycle (RFR) . 6. The port repeats the Ring cycle (RPR). 7. The port applies the Ring Silence condition (RPR).

* Without a valid ringer load present the opto coupler output value will be "1". The port is sending out a ring voltage but there is no ringer connected on the other side to draw ring current.

# If during the ring pre-trip test any of the opto couplers show a "0" for a valid amount of time, then ringing is not applied to this port.

If at any time during ringing the Off-Hook Normal or Off-Hook Reverse condition occurs the ring generation stops.

f L e XiBle Com pu te r Te leph ony I n terfa ce So lu tions 36 CTPX

RING-TRIP

Ring trip is required for FXS interface port operation.

RING-DETECTION

Ring detection is required for FXO interface port operation.

1. As soon as the first change from the idle state has been detected, then . The ring frequency timer starts tuning the first ring cycle.

3. The πng frequency timer value is recorded as soon as the second ring cycle starts.

4. As soon as the first change from the idle state has been detected, then

5. The ring frequency timer starts timing the second ring cycle.

6. The ring frequency timer value is recorded as soon as the third ring cycle starts.

7. The ring frequency timer value is checked against the current value loaded in the lower frequency register.

8. The ring frequency timer value is checked against the current value loaded in the upper frequency register.

9. If the timer value fits the ring frequency range than the ring detection flag is set.

Ring Detection Logic Diagram of one full Ring Period

f L eXiBle Com pu ter Te lephony In te rfa ce Solu tion s 37 CTPX

SIGNAL VALIDATION

All received analog signals are validated with 20 ms processing delay. Any analog event that appears and disappears within a 20 ms window is being ignored. Signal validation is required for the purposes of reducing sporadic triggering ofthe digital AB receive signals. All digital A/B transmit signals are accepted and passed on to the analog port without validation. l

fLeXiBle Computer Telephony Interface Solutions 38 CTPX

INTERFACE TABLES

The A-bit and B-bit transmit and receive signaling states listed here are defined in Bell publication 43801. Opto- coupler conditions not listed in a specific state are considered errors and are reported to the TER.

FXO-LS

FXO-RB

During a closed loop condition the Opto coupler indication occursn et er pars or pars.

FXO-GS

fLeXiBle Computer Telephony Interface Solutions 39 CTPX

FXS-LS

Note: See ring generation for "Rng" conditions.

FXS-RB

urng a cose oop con on t e pto couper n caton occurs n et er pars or pars.

FXS-GS

Note: See ring generation for "Rng" conditions.

fLeXiBle Computer Telephony Interface Solutions 40 CTPX

DPO

fLeXiBle Computer Telephony Interface Solutions 41 CTPX

2-W, E&M II

Note: The following module pins must be re-lαbeledfor E&M type IV interface operation: The E-lead pin becomes the M-lead pin. The M-lead pin becomes the E-lead pin. The SG-lead pin becomes the SB-leadpin. The SB-leadpin becomes the SG-lead pin.

fLeXiBle Computer Telephony Interface Solutions 42 CTPX

fLeXiBle Computer Telephony Interface Solutions 43 CTPX

2-lrV, PLR IV

2-lrV, PLR V

fLeXiBle Computer Telephony Interface Solutions 44 CTPX

4-W, E&M II

4-W, E&M III

fLeXiBle Computer Telephony Interface Solutions 45 CTPX

fLeXiBle Computer Telephony Interface Solutions 46 CTPX

fLeXiBle Computer Telephony Interface Solutions 47 CTPX

SERVICE

In the event of a product malfunction, CTPX Telecommunications, Inc. or an authoπzed agent should perform all repairs. It is the responsibility of users requiring service to report the need for service to CTPX Telecommunications, Inc. or to one of our authorized agents.

HARDWARE REPAIRS

Module repairs not covered under warranty are based on a flat fee charge for parts and labor. Please consult with CTPX Telecommunications, Inc. for the up-to-date repair charge.

SOFTWARE UPGRADES

Software upgrades are based on a license fee charge. Please consult with CTPX Telecommunications, Inc. for the up-to-date upgrade charge.

TECH SUPPORT

For 24-hour technical support, call CTPX Telecommunications, Inc. and ask for tech support.

CONTACT ADDRESS

Service can be obtained at:

f L e XiB le Comp u t e r Tele hon y In t rfa ce S ol tio ns 48

Claims

What is claimed is:
1. Apparatus comprising an electronic/software module or unit that provides analog telephony functionality.
2. Apparatus according to claim 1 wherein the unit acts like a universal PBX (private branch exchange) analog line card.
3. Apparatus according to claim 1 wherein the unit is field programmable.
4. Apparatus according to claim 1 wherein the unit is operating system independent, and/or provides a serial programming interface.
5. Apparatus according to claim 1 wherein the unit is provided in the form of a printed circuit module that may be mounted in an expansion slot of a computing system such as a personal computer or workstation.
6. Telephony apparatus including one or more ofthe following features are provided in the module or unit, alone or in combination: FEATURES
• Acts as a Universal PBX Analog Line Card CMOS And TTL Compatible Inputs And Outputs
• Direct A and B Signaling Bit Access Pins
• Fully Remote Controllable Telephony Interface • Industrial Strength Isolation Barrier
• In-System Programmability
• Low Noise Design
• Low Power Consumption
• Low RFI Emissions • Meets Or Exceeds AT&T Bell System Technical Reference 43801
• No DIP Switches and No Jumpers
• On-Board Ring Generator On-Board Battery Power Supply Operating System Independent Programmable:
CAS Bit Manipulations
Control Interfaces
Framing Modes
Internal Hybrid Balance Network
Loop-Back Modes
PCM Interfaces
Telephony Interfaces
Receive Gain
Ringing Frequency
Ringing Voltage
Telecom Voltage
Timeslot Assignment
Transmit Gain μ-Law or A-Law Companding Serially Programmable Interface Single Voltage Power Supply Input Small Dual-In-Line Package Footprint State-of-the-Art Technology Supports:
Extensive Channel Associated Signaling Bit Manipulation
Standard PCM Interfaces
Standard Telephony Interfaces
Standard Serial Interfaces
FXO, FXS, DPO, DPT, E&M, PLR, ETO, And TO Interfaces
Loop-Start, Ground-Start And Direct-Inward-Dialing
E&M Type I, II, III, IV, And V Signaling
Two- Wire And Four- Wire Transmissions Transparent Interface Conversion Operation Universal Asynchronous Receiver Transmitter Interface
7. Telephony apparatus including one or more the features or functions of the system of claim 6 used so as to provide any one or more, alone or in combination, ofthe following applications: APPLICATIONS
Automatic Call Distributors
Central Offices
Digital Loop Carriers
Fax Boards • Fiber-In-The-Loop
Hybrid-Fiber/Coax
Gateways
Key Telephone Systems
Modems • Multiplexers
Private Branch Exchanges
PC-PBX
IP-PBX
Remote Terminals • Voice Processing Boards
Wireless Local Loop
8. Telephony apparatus including one or more ofthe multitude of design details set forth in the accompanying specification are implemented in one or more ofthe apparatus of claims 1 to 7.
9. A method comprising providing an electronic/software module or unit that provides analog telephony functionality.
10. A method according to claim 9 wherein the unit acts like a universal PBX (private branch exchange) analog line card.
11. A method according to claim 9 wherein the unit is field programmable.
12. A method according to claim 9 wherein the unit is operating system independent, and/or provides a serial programming interface.
13. A method according to claim 9 wherein the unit is provided in the form of a printed circuit module that may be mounted in an expansion slot of a computing system such as a personal computer or workstation.
14. A telephony method including one or more ofthe following features are provided in a module or unit, alone or in combination: FEATURES
Acts as a Universal PBX Analog Line Card CMOS And TTL Compatible Inputs And Outputs • Direct A and B Signaling Bit Access Pins
Fully Remote Controllable Telephony Interface Industrial Strength Isolation Barrier In-System Programmability Low Noise Design • Low Power Consumption
Low RFI Emissions
Meets Or Exceeds AT&T Bell System Technical Reference 43801 No DIP Switches and No Jumpers On-Board Ring Generator • On-Board Battery Power Supply
Operating System Independent Programmable:
CAS Bit Manipulations Control Interfaces • Framing Modes
Internal Hybrid Balance Network Loop-Back Modes PCM Interfaces Telephony Interfaces
Receive Gain
Ringing Frequency
Ringing Voltage
Telecom Voltage
Timeslot Assignment
Transmit Gain μ-Law or A-Law Companding Serially Programmable Interface Single Voltage Power Supply Input Small Dual-In-Line Package Footprint State-of-the-Art Technology Supports:
Extensive Channel Associated Signaling Bit Manipulation
Standard PCM Interfaces
Standard Telephony interfaces
Standard Serial Interfaces
FXO, FXS, DPO, DPT, E&M, PLR, ETO, And TO Interfaces
Loop-Start, Ground-Start And Direct-Inward-Dialing
E&M Type I, II, III, IV, And V Signaling
Two- Wire And Four- Wire Transmissions Transparent Interface Conversion Operation Universal Asynchronous Receiver Transmitter Interface
15. A telephony method including one or more the features or functions of the system of claim 14 used so as to provide any one or more, alone or in combination, ofthe following applications: APPLICATIONS
• Automatic Call Distributors
• Central Offices
• Digital Loop Carriers
• Fax Boards Fiber-In-The-Loop
Hybrid-Fiber/Coax
Gateways
Key Telephone Systems
Modems
Multiplexers
Private Branch Exchanges
PC-PBX
IP-PBX • Remote Terminals
Voice Processing Boards
Wireless Local Loop 16. A telephony method including one or more ofthe multitude of design details set forth in the accompanying specification are implemented in one or more of the apparatus of claims 9 to 15.
PCT/US2000/022863 1999-08-18 2000-08-18 Field programmable telephony interface module WO2001013604A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14959399 true 1999-08-18 1999-08-18
US60/149,593 1999-08-18

Publications (2)

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WO2001013604A2 true true WO2001013604A2 (en) 2001-02-22
WO2001013604A3 true WO2001013604A3 (en) 2001-08-30

Family

ID=22530993

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/022863 WO2001013604A3 (en) 1999-08-18 2000-08-18 Field programmable telephony interface module

Country Status (1)

Country Link
WO (1) WO2001013604A3 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017074872A1 (en) * 2015-10-30 2017-05-04 Contec, Llc Universal testing system architecture
US9810735B2 (en) 2015-09-25 2017-11-07 Contec, Llc Core testing machine
US9836376B2 (en) 2009-09-24 2017-12-05 Contec, Llc Method and system for automated test of end-user devices
US9838295B2 (en) 2015-11-23 2017-12-05 Contec, Llc Wireless routers under test
US9900113B2 (en) 2016-02-29 2018-02-20 Contec, Llc Universal tester hardware
US9900116B2 (en) 2016-01-04 2018-02-20 Contec, Llc Test sequences using universal testing system
US9960989B2 (en) 2015-09-25 2018-05-01 Contec, Llc Universal device testing system
US9992084B2 (en) 2015-11-20 2018-06-05 Contec, Llc Cable modems/eMTAs under test

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993022864A1 (en) * 1992-05-05 1993-11-11 American Tel-A-Systems, Inc. Digital switching system connecting buses with incompatible protocols and telephone answering system and private automatic branch exchange with integrated voice and textual message recording
WO1998008324A2 (en) * 1996-08-20 1998-02-26 Advanced Micro Devices, Inc. Microprocessor-controlled full-duplex speakerphone using automatic gain control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993022864A1 (en) * 1992-05-05 1993-11-11 American Tel-A-Systems, Inc. Digital switching system connecting buses with incompatible protocols and telephone answering system and private automatic branch exchange with integrated voice and textual message recording
WO1998008324A2 (en) * 1996-08-20 1998-02-26 Advanced Micro Devices, Inc. Microprocessor-controlled full-duplex speakerphone using automatic gain control

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
APFEL RUSSEL ET AL: "Signal-processing chips enrich telephone line-card architecture" ELECTRONICS, 5 May 1982 (1982-05-05), pages 113-118, XP000983006 New York (US) *
DAVID P. LAUDE: "A Monolithic subscriber line interface circuit" IEEE JOURNAL OF SOLID-STATE CIRCUITS., vol. SC-16, no. 4, August 1981 (1981-08), pages 266-270, XP002160794 IEEE INC. NEW YORK., US ISSN: 0018-9200 *
IAN L. MCWALTER ET AL: "A Monolithic line card circuit" PROCEEDINGS OF THE 1982 CUSTOM INTEGRATED CIRCUITS CONFERENCE, 17 - 19 May 1982, pages 225-228, XP000986513 Rochester(US) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9836376B2 (en) 2009-09-24 2017-12-05 Contec, Llc Method and system for automated test of end-user devices
US9836375B2 (en) 2009-09-24 2017-12-05 Contec, Llc Method and system for automated test of multi-media user devices
US9810735B2 (en) 2015-09-25 2017-11-07 Contec, Llc Core testing machine
US9960989B2 (en) 2015-09-25 2018-05-01 Contec, Llc Universal device testing system
WO2017074872A1 (en) * 2015-10-30 2017-05-04 Contec, Llc Universal testing system architecture
US9992084B2 (en) 2015-11-20 2018-06-05 Contec, Llc Cable modems/eMTAs under test
US9838295B2 (en) 2015-11-23 2017-12-05 Contec, Llc Wireless routers under test
US9900116B2 (en) 2016-01-04 2018-02-20 Contec, Llc Test sequences using universal testing system
US9900113B2 (en) 2016-02-29 2018-02-20 Contec, Llc Universal tester hardware

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