GB1515720A - Detection of call answer signals in a communication syste - Google Patents

Detection of call answer signals in a communication syste

Info

Publication number
GB1515720A
GB1515720A GB4601575A GB4601575A GB1515720A GB 1515720 A GB1515720 A GB 1515720A GB 4601575 A GB4601575 A GB 4601575A GB 4601575 A GB4601575 A GB 4601575A GB 1515720 A GB1515720 A GB 1515720A
Authority
GB
United Kingdom
Prior art keywords
ringing
line
phase
detector
during
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB4601575A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co 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
Priority claimed from US05/521,651 external-priority patent/US3978292A/en
Priority claimed from US05/521,734 external-priority patent/US3978293A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1515720A publication Critical patent/GB1515720A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

1515720 Automatic exchange systems WESTERN ELECTRIC CO Inc 6 Nov 1975 [7 Nov 1974 (2)] 46015/75 Heading H4K A ring trip arrangement common to a group of lines each of which receives ringing current during a different phase, comprises a loop current detector that is selectively connected to one line at a time during the ringing phase thereof. Preferably all the lines are arranged in groups each with a common loop detector, and a common ringing generator is connected to each detector so as to apply current therethrough to more than one line during each phase (Fig. 1 not shown). The arrangement is for use in a TDM system where high voltage ringing must be applied at the line circuits rather than via the network. Fig. 3 depicts the arrangement for a single group. A not shown control system marks wires BPS, BBS of a called line and at the start of each ringing phase (there being 4 phases, each of 1 sec on 3 secs off) also marks BRBS, BRBC such that flip flop RFF sets to turn-on relay RINGO. The latter connects ringing current from generator RG via common detector D1 to the ring lead R of the called line TS1. At the end of the phase, wires BRBS, BRBC are marked such as to reset RFF and thus drop RINGO. During the "silent" portions of ringing, line relay LCO monitors the line for an answer signal and repeats the answer via gate SS to control (SS is prepared by the called line marking on BPS, BBS and the reset condition of RFF). If the subscriber replies during a ringing phase, detector D1 causes RFF to immediately reset, thus dropping RINGO and thereby permitting LCO to rise with results as before.
GB4601575A 1974-11-07 1975-11-06 Detection of call answer signals in a communication syste Expired GB1515720A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/521,651 US3978292A (en) 1974-11-07 1974-11-07 Ringing control circuitry with shared ringing loop current detector
US05/521,734 US3978293A (en) 1974-11-07 1974-11-07 Ringing control circuitry with shared ringing loop current detector

Publications (1)

Publication Number Publication Date
GB1515720A true GB1515720A (en) 1978-06-28

Family

ID=27060535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4601575A Expired GB1515720A (en) 1974-11-07 1975-11-06 Detection of call answer signals in a communication syste

Country Status (9)

Country Link
JP (1) JPS5169906A (en)
BR (1) BR7507193A (en)
DE (1) DE2549469C2 (en)
ES (1) ES442422A1 (en)
FR (1) FR2290805A1 (en)
GB (1) GB1515720A (en)
IT (1) IT1048758B (en)
NL (1) NL7513016A (en)
SE (1) SE7512060L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2755639C2 (en) * 1977-12-14 1985-06-05 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for the logical processing of subscriber criteria in telecommunications, in particular telephone switching systems
FR2451682A1 (en) * 1979-03-12 1980-10-10 Jeumont Schneider CALL DEVICE FOR AUTOMATIC SUBSCRIBER TELEPHONE INSTALLATION WITH ADDITIONAL STATIONS
JPS56119565A (en) * 1981-02-12 1981-09-19 Hitachi Ltd Signal processing device in subscriber's circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720793A (en) * 1971-09-01 1973-03-13 Bell Telephone Labor Inc Supervisory circuit arrangement for telephone subscriber lines
FR2171594A5 (en) * 1972-02-08 1973-09-21 Constr Telephoniques
FR2172537A5 (en) * 1972-02-17 1973-09-28 Constr Telephoniques

Also Published As

Publication number Publication date
FR2290805A1 (en) 1976-06-04
SE7512060L (en) 1976-05-10
NL7513016A (en) 1976-05-11
JPS571171B2 (en) 1982-01-09
DE2549469A1 (en) 1976-05-13
FR2290805B1 (en) 1981-02-06
BR7507193A (en) 1976-08-10
JPS5169906A (en) 1976-06-17
IT1048758B (en) 1980-12-20
DE2549469C2 (en) 1984-05-17
ES442422A1 (en) 1977-08-16

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19951105