KR20020064393A - Analog subscriber interfacing apparatus for providing a calling identity delivery service - Google Patents

Abstract

PURPOSE: A connection device for an analog subscriber for providing a CID(Calling Identity Delivery) service is provided to offer the CID service to the analog subscriber using an analog telephone for CID. CONSTITUTION: A voice converting unit(109) receives a digital voice signal from a digital subscriber line of a private branch exchange and converts the received digital voice signal into an analog voice signal. An FSK(Frequency Shift Keying) signal generating and transmitting unit(106) receives a caller ID from the digital subscriber line and generates an FSK signal corresponding to the received caller ID. A frame forming and PCM(Pulse Code Modulation) processing unit(102) transmits the analog voice signal and the FSK signal according to a previously determined data transmission rule.

Description

ANALOG SUBSCRIBER INTERFACING APPARATUS FOR PROVIDING A CALLING IDENTITY DELIVERY SERVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber access device of a private exchange, and more particularly to an analog subscriber access device for providing caller information to a subscriber using an analog telephone for caller identity delivery (CID).

In general, private exchanges can provide subscribers with a variety of private exchange services, including basic functions that allow telephone subscribers in certain areas, such as companies and schools, to communicate only through private exchanges, rather than through the telephone office. In particular, recently, private exchanges, which have a digital subscriber board and can provide a variety of private exchange services to digital subscribers, have been widely used.

Conventional private exchanges provide digital extension telephone subscribers with a CID service that displays the caller's telephone number, name and time, etc. on the called party's phone. That is, the private exchange receives caller information, including the telephone number, name, and time of the caller who is its own subscriber, public telephone network subscriber, or subscriber of another private switching network, from its own subscriber, public telephone network or other private switching network, and receives the called party. Is a digital subscriber connected to the digital subscriber board of the private exchange, the private exchange transmits this caller information to the destination digital subscriber via the data channel to display the caller information on the liquid crystal display screen of the digital telephone of the destination digital subscriber. .

On the other hand, analog telephones are used because they are cheaper than digital telephones. However, conventional analog telephones connected to the analog subscriber board of a private exchange provide a number of functions provided by a voice call and a private exchange, but no CID service.

Recently, analog telephones for CIDs having liquid crystal display screens that can be connected to a local exchange and receive CID services have been developed in accordance with the data transmission interface technical standard in public switched telephone network subscriber lines for CIDs.

However, the conventional private exchange does not have a separate subscriber board that can provide caller information display service to the CID analog telephone, so that the CID service cannot be provided even when the CID analog telephone is connected to the private exchange. there was.

Therefore, it is an object of the present invention to provide a CID analog subscriber access device capable of providing CID service to an analog subscriber using an analog telephone for CID.

According to an aspect of the present invention, there is provided a means for receiving a digital voice signal from a digital subscriber board of a private exchange and converting it into an analog voice signal, and receiving caller information from the digital subscriber board to receive the received caller information. And a means for generating an FSK signal corresponding to the caller; and means for transmitting the analog voice signal and the FSK signal according to a predetermined data transmission rule. to provide.

1 is a diagram showing an example of connection between a private switch, a subscriber telephone, and an external switching network according to the present invention;

2 is a block diagram showing an embodiment of a CID analog subscriber access device according to the present invention;

<Description of the symbols for the main parts of the drawings>

10: private exchange

50: analog phone for CID

100: CID analog subscriber connection device

104: processor unit for CID

105: CAS and SAS signal generation and transmission unit

106: FSK signal generation and transmission unit

107: DTMF signal receiving unit

108: ring signal control unit

109: voice conversion unit

Hereinafter, an analog subscriber access device and a private exchange using the same for providing a Calling Identity Delivery (CID) service according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, FIG. 1 is a diagram showing a connection example of a private exchange and a subscriber telephone, another private exchange, and a local exchange according to the present invention. As shown, the private exchange 10 according to the present invention is provided to an analog telephone subscriber. It is configured to provide a CID service, is connected to the local exchange 20 through a Public Switched Telephone Network (PSTN) (61), and with other private exchanges (30) through a dedicated line (62). It is connected to the general analog phone 40, CID analog phone 50 and the digital phone 60 is connected.

In Fig. 1, the private exchange 10 has an analog subscriber board connected to a regular analog telephone 40 and a two-wire analog subscriber line 63, analog voice calls and transfers, conference calls. Services such as call pickup, speed dialing, and the like to the general analog phone 40. For example, an analog telephone subscriber uses a service by dialing function codes such as # 1 and # 2 in a general analog telephone 40 of a dual-tone multi-frequency (DTMF) scheme.

In addition, the private exchange 10 is connected to the digital telephone 60 through a digital subscriber line 65 with a digital subscriber board supporting a connection scheme using a dedicated protocol and signal standard. The digital telephone 60 is provided with various services in addition to the services provided for digital voice calls and analog telephones. Since the digital telephone 60 has a display screen and various function buttons, the digital subscriber can press a function button instead of pressing a function code as in the analog phones 40 and 50 and receive a guide for the corresponding function on the display screen. Various services are more convenient than analog subscribers.

In addition, the private switch 10 includes a CID analog subscriber connection device at the rear end of the digital subscriber board, and is connected to the CID analog telephone 50 through a two-wire analog subscriber line 64, and a general analog telephone 40 In addition to the service provided in the C), the CID service is further provided to the analog phone 50 for the CID. The CID analog telephone 50 has a display screen and supports a CID data transmission interface to receive and display caller information including the caller's telephone number, name, and time from the private exchange 10.

For example, the private exchange 10 as described above may be implemented by adding a CID analog subscriber access device for accommodating analog subscribers for CID to Meridian 1 or SL-1 of Nortel Netwroks. Digital line signals including digital voice signals and digital telephone control signals transmitted and received with a digital subscriber in a Meridian 1 or SL-1 private exchange may be coded in a Bipolar Return-to-Zero-Alternate Mark Inversion (BPRZ-AMI) scheme. It is transmitted and received at 512 Kbps using the TCM (Time Compression Multiplexing) transmission scheme. According to one embodiment of the present invention, the CID analog subscriber connection device is connected to the rear end of the digital subscriber board provided in the private exchange 10 as described above, and the CID analog subscriber connection is connected via the 2-wire analog subscriber line 64. By connecting the connecting device and the analog telephone 50 for CID, the analog telephone 50 for CID is connected. Provide CID service.

2 is a block diagram showing an embodiment of a CID analog subscriber access device according to the present invention.

As shown in FIG. 2, the CID analog subscriber access device 100 includes a TCM line interface unit 101, a frame forming and pulse coded multiplexing (PCM) processing unit 102, a main processor unit 103, and a CID processor unit. (104), CAS (Customer Premise Equipment) signaling and subscriber alerting signal (SAS) signal generation and transmission unit 105, frequency shift keying (FSK) signal generation and transmission unit 106, DTMF signal reception unit 107 And a ring signal control unit 108, a voice conversion unit 109, an analog subscriber interface unit 110, and an analog subscriber connection terminal 111.

The TCM line interface unit 101 is connected to the digital subscriber board (not shown) of the private exchange 10, matches the impedance with the digital subscriber board, and receives a digital line of the BPRZ-AMI coding scheme received from the digital subscriber board. It converts a signal to TTL (Transistor Transistor Logics) level and vice versa.

The frame forming and PCM processing unit 102 is connected to the TCM line interface unit 101 and the voice conversion unit 109 to set the frame structure of the digital line signal transmitted and received from the digital subscriber board (not shown), and the transmission rate Converts and sets the frame structure of the analog line signal including the analog voice signal and the analog telephone control signal transmitted and received to and from the analog phone 50 and converts the transmission speed.

The main processor unit 103 is connected to the frame forming and PCM processing unit 102 to manage digital line signals and analog line signals, control the asynchronous transmission speed of the digital line signals, and monitor the transmission and reception status of the digital line signals.

The CID processor unit 104 is connected to the frame forming and PCM processing unit 102 to collect caller information including the caller's telephone number, name and time, etc., transmitted from the digital subscriber board. In addition, the CID processor unit 104 is connected to the CAS and SAS signal generation and transmission unit 105, the FSK signal generation and transmission unit 106, the DTMF signal reception unit 107 and the ring signal control unit 108, and the CAS and SAS signal Controls transmission, FSK signal transmission, collects and controls DTMF signals, and controls analog telephone ring signals.

The CAS and SAS signal generation and transmission unit 105 generates the CAS and SAS signals, which are CID control signals, under the control of the CID processor unit 104 to generate the CID through the voice conversion unit 109 and the analog subscriber interface unit 110. Transmit to analog phone 50. The CAS is a signal for preparing the analog telephone 50 for the CID to receive data, and the SAS is a signal for the calling subscriber and the called subscriber to recognize that the new call is waiting.

The FSK signal generation and transmission unit 106 generates the CID FSK signal under the control of the CID processor unit 104, and the CID through the voice conversion unit 109 and the analog subscriber interface unit 110 according to the predetermined CID data transmission interface. To analog phone 50 for transmission.

The DTMF signal receiver 107 is connected to the voice converter 109 to collect, analyze, and transmit the DTMF signal transmitted from the analog phone to the processor unit 104 for the CID.

The ring signal controller 108 controls the transmission of the ring signal supplied to the analog telephone under the control of the processor unit 104 for the CID.

The voice converter 109 is connected to the frame forming and PCM processing unit 102 and the analog subscriber interface unit 110 to convert the analog voice signal into a digital voice signal and vice versa, and adjust the level of the analog voice signal. .

The analog subscriber interface unit 110 performs a function of monitoring a loop state, supplying a call current, and transmitting an analog voice signal through a two-wire / four-wire conversion circuit when the CID analog telephone 50 is called or answered. The ring signal is sent to the CID analog telephone 50 under the control of the signal control unit 108.

The CID analog telephone 50 is connected to the analog subscriber connection terminal 111 via two wires.

Although the above describes the CID analog subscriber access device according to an embodiment of the present invention, this does not limit the scope of the present invention, and all other possible modifications may be made to the CID analog subscriber access device. For example, the CID analog subscriber access device may be implemented as a board separate from the digital subscriber board as described above and mounted in a private switch, or may be implemented as a board and a digital subscriber board and mounted in a private exchange. . Alternatively, the CID analog access point connection device may be installed outside the private exchange as a separate device from the private exchange, connected to the digital subscriber board of the private exchange through a digital subscriber line, and connected to the analog telephone for the CID and a 2-wire analog subscriber line.

Hereinafter, a process of providing a CID service to the CID analog phone 50 will be described in detail with reference to FIGS. 1 and 2.

When the TCM line interface unit 101 receives a digital line signal of a BPRZ-AMI coding method including a caller information including a caller phone number, a name, and a time from a digital subscriber board at a 512 Kbps transmission rate, the TTL (Transistor Transistor Logics) ) Is converted into a frame level and transmitted to the frame forming and PCM processing unit 102.

The frame forming and PCM processing unit 102 transmits the caller information received from the TCM line interface unit 101 to the CID processor unit 104.

The CID processor unit 104 analyzes the sender information received through the frame forming and the PCM processing unit 102 and converts the FSK signal generation and transmission unit 106 into data types recognizable by the FSK signal generation and transmission unit 106. And the ring signal controller 108 to notify the caller of the reception of the caller information.

The FSK signal generation and transmission unit 106 generates an FSK signal for the caller information data received from the CID processor unit 104 and performs the voice conversion unit 109 and the analog subscriber interface unit 110 according to a predetermined CID data transmission interface. And it transmits to the analog telephone 50 for CIDs through the analog subscriber connection terminal 111.

The ring signal control unit 108 controls the analog subscriber interface unit 110 to transmit a ring signal before transmitting the caller information to the CID analog telephone 50.

At this time, if the called subscriber is not busy, that is, if the CID analog phone 50 is on-hook, the analog subscriber interface 110 transmits a ring signal and transmits an FSK signal.

In the CID analog telephone 50, after receiving the first ring signal from the access device 100, the caller information is received and displayed on the display screen, and the ring signal is transmitted until the subscriber responds.

When the subscriber responds, i.e., is in the off-hook state, the analog subscriber interface 110 detects the subscriber response signal transmitted from the analog phone 50 for CID and notifies the CID processor 104. In addition, the CID processor 104 controls the ring signal controller 108 to stop transmitting the ring signal and transmits the subscriber's response signal to the frame forming and PCM processing unit 102 to make a voice call with the calling subscriber. In the voice call, the voice conversion unit 109 performs a conversion function between an analog voice signal and a digital voice signal, and the frame forming and PCM processing unit 102 performs a frame setting and a transmission rate reproducing function.

When the call is terminated, that is, the on-hook state, the analog subscriber interface unit 110 detects the recovery signal transmitted from the analog CID phone 50 for the CID and forms the circuit recovery state through the CID processor unit 104. And notifies the PCM processing unit 102.

On the other hand, when the called party is busy, the CID processor unit 104 converts the CAS and SAS signals and the FSK signal through the voice conversion unit 109 and the analog subscriber interface unit 110 according to a predetermined CID data transmission interface. The CAS and SAS signal generation and transmission unit 105 and the FSK signal generation and transmission unit 106 are controlled to transmit to the telephone 50.

As described above, according to the present invention, by providing a CID analog subscriber connection device capable of converting between a digital line signal and an analog line signal and processing a control signal for a CID service, an analog telephone for a CID is provided in a private switch having a digital subscriber line. To enable CID service.

Although the invention has been particularly shown and described by the foregoing detailed description, it will be appreciated that various changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims. It is self-evident.

Claims (5)

In Calling Identity Delivery (CID) analog subscriber access device, Means for receiving a digital voice signal from a digital subscriber board of the private exchange and converting the digital voice signal into an analog voice signal; Means for receiving caller information from the digital subscriber board and generating an FSK signal corresponding to the received caller information; Means for transmitting the analog voice signal and the FSK signal according to a predetermined data transmission rule; CID analog subscriber connection device comprising. The method of claim 1, And the caller information and the digital voice signal transmitted from the digital subscriber board are coded in a Bipolar Return-To-Zero-Alternate Mark Inversion (BPRZ-AMI) scheme and transmitted at a predetermined transmission rate. In the Calling Identity Delivery (CID) analog subscriber access device for use in a private exchange, Means for performing digital subscriber board functions; Means for receiving a digital voice signal from said digital subscriber board means and converting it into an analog voice signal; Means for receiving caller information from the digital subscriber board means and generating an FSK signal corresponding to the received caller information; Means for transmitting the analog voice signal and the FSK signal according to a predetermined data transmission rule; CID analog subscriber connection device comprising. The method of claim 3, And the caller information and the digital voice signal transmitted from the digital subscriber board means are coded in a Bipolar Return-To-Zero-Alternate Mark Inversion (BPRZ-AMI) scheme and transmitted at a predetermined transmission rate. 4. A CID analogue subscriber connection device as claimed in claim 3, wherein all means are implemented in one board.