SE7710346L - DEFINITION CONTROL DEVICE FOR TELEPHONE EXCHANGE FOR COMPENSATION OF VARIOUS SUBSCRIBER LOSS LOSSES - Google Patents

DEFINITION CONTROL DEVICE FOR TELEPHONE EXCHANGE FOR COMPENSATION OF VARIOUS SUBSCRIBER LOSS LOSSES

Info

Publication number
SE7710346L
SE7710346L SE7710346A SE7710346A SE7710346L SE 7710346 L SE7710346 L SE 7710346L SE 7710346 A SE7710346 A SE 7710346A SE 7710346 A SE7710346 A SE 7710346A SE 7710346 L SE7710346 L SE 7710346L
Authority
SE
Sweden
Prior art keywords
compensation
control device
telephone exchange
various subscriber
definition control
Prior art date
Application number
SE7710346A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE425537B (en
Inventor
D C A Connolly
Original Assignee
Gen Electric Co Ltd
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
Application filed by Gen Electric Co Ltd filed Critical Gen Electric Co Ltd
Publication of SE7710346L publication Critical patent/SE7710346L/en
Publication of SE425537B publication Critical patent/SE425537B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

A method and apparatus for compensating for variations in subscribers apparatus and individual line lengths by measuring during the set up period of a call, the voltage variation across the feed at constant current. This voltage variation is then used, by application to a simple A/D converter, to provide a coarse digital evaluation of the line length.
SE7710346A 1976-09-17 1977-09-15 SET AND DEVICE TO COMPENSATE FOR DIFFERENCES IN LINE LINE IMPEDANCE IN A TIME DISTRIBUTION MULTIPLEX ORGANIZED PHONE SYSTEM SE425537B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38555/76A GB1584778A (en) 1976-09-17 1976-09-17 Telecommunication exchanges

Publications (2)

Publication Number Publication Date
SE7710346L true SE7710346L (en) 1978-03-18
SE425537B SE425537B (en) 1982-10-04

Family

ID=10404250

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7710346A SE425537B (en) 1976-09-17 1977-09-15 SET AND DEVICE TO COMPENSATE FOR DIFFERENCES IN LINE LINE IMPEDANCE IN A TIME DISTRIBUTION MULTIPLEX ORGANIZED PHONE SYSTEM

Country Status (8)

Country Link
BE (1) BE858816A (en)
CA (1) CA1089131A (en)
DE (1) DE2741667A1 (en)
FR (1) FR2365252A1 (en)
GB (1) GB1584778A (en)
NL (1) NL7710118A (en)
SE (1) SE425537B (en)
ZA (1) ZA775490B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254305A (en) * 1979-02-07 1981-03-03 International Telephone And Telegraph Corporation Current limited subscriber line feed circuit
US4272648A (en) * 1979-11-28 1981-06-09 International Telephone And Telegraph Corporation Gain control apparatus for digital telephone line circuits
DE3902439A1 (en) * 1989-01-27 1990-08-02 Basf Ag PLANT PROTECTIVE AGENTS BASED ON 1-ARYL OR 1-HETARYLIMIDAZOLE CARBONIC ACID ESTERS
US5274703A (en) * 1991-05-23 1993-12-28 At&T Bell Laboratories Automatic loss control circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299735B (en) * 1965-08-04 1969-07-24 Siemens Ag Circuit arrangement for telephone systems, in particular private branch exchanges with telephone stations, which have an automatic attenuation compensation
US3781481A (en) * 1971-09-30 1973-12-25 Stromberg Carlson Corp Amplifier select and control circuit
DE2250651B2 (en) * 1972-10-16 1975-06-19 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for attenuation compensation in a private branch exchange with four-wire connection paths
DE2347696C3 (en) * 1973-09-21 1978-12-21 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for feeding subscriber lines in telephone switching systems
US3903378A (en) * 1974-03-27 1975-09-02 Gte Automatic Electric Lab Inc Arrangement for controlling the gain of two-way amplifiers in accordance with loop lengths

Also Published As

Publication number Publication date
DE2741667A1 (en) 1978-03-23
NL7710118A (en) 1978-03-21
FR2365252B1 (en) 1982-03-26
CA1089131A (en) 1980-11-04
DE2741667C2 (en) 1987-09-24
SE425537B (en) 1982-10-04
BE858816A (en) 1978-01-16
GB1584778A (en) 1981-02-18
ZA775490B (en) 1978-07-26
FR2365252A1 (en) 1978-04-14

Similar Documents

Publication Publication Date Title
SE411157B (en) PROTECTIVE DEVICE FOR LOW VOLTAGE LINES SEPARATE TELEPHONE LINE NETWORK
BE817449A (en) AUXILIARY RINGING NETWORK FOR TELEPHONE STATION.
BE843042A (en) DIGITAL MULTITONE GENERATOR FOR TELEPHONE NUMBERING
DK577877A (en) TELEPHONE CALL NETWORK
FR2280261A1 (en) TELEPHONE TELECOMMUNICATION DEVICE
SE397162B (en) CIRCUIT DEVICE FOR CONFERENCE CONNECTION OF TELEPHONE SUBSCRIBERS
SE7710346L (en) DEFINITION CONTROL DEVICE FOR TELEPHONE EXCHANGE FOR COMPENSATION OF VARIOUS SUBSCRIBER LOSS LOSSES
SE392557B (en) SUBSCRIBER TELEPHONE
EP0119234B1 (en) Apparatus for the current supply of a subscriber set from an exchange
BE861868A (en) SUBSCRIBER LINE EQUIPMENT FOR TELEPHONE CENTRAL
IT8221844A0 (en) ELECTRONIC VOICE NETWORK FOR TELEPHONE SUBSCRIBER SUBSTATIONS.
JPS52139302A (en) Automatic circuit switching unit
ATE77723T1 (en) METHOD FOR DETERMINING THE TIME CHARACTERISTICS OF DIALING PULSE INDEPENDENT OF THE LINE LENGTH OF SUBSCRIBERS' LINES OF A TELECOMMUNICATION SWITCHING SYSTEM.
IT1089420B (en) ELECTRONIC NETWORK FOR TELEPHONE DEVICES
BE861080A (en) SUBSCRIBER LINE EQUIPMENT FOR TELEPHONE CENTRAL
BE604888A (en) Dial light for telephone network station
FR1134091A (en) Subscriber telephone set
CH413925A (en) Device for charging telephone subscribers
GB1504062A (en) Loop current detector
JPS5247305A (en) Extension calling systemof button telephone system
JPS51117808A (en) Incoming call transfer service system
JPS5547764A (en) Electronic call meter unit
FR1265288A (en) Method and installation for obtaining an electrical network stabilized in frequency and voltage
SU458837A2 (en) Multiplying-dividing device
SE7601730L (en) DEVICE FOR CALL METERS FOR SUBSCRIBERS

Legal Events

Date Code Title Description
NAL Patent in force

Ref document number: 7710346-3

Format of ref document f/p: F

NUG Patent has lapsed

Ref document number: 7710346-3

Format of ref document f/p: F