GB1207467A - Improvements to digital signal transmission systems in telecommunication exchanges - Google Patents

Improvements to digital signal transmission systems in telecommunication exchanges

Info

Publication number
GB1207467A
GB1207467A GB2065769A GB2065769A GB1207467A GB 1207467 A GB1207467 A GB 1207467A GB 2065769 A GB2065769 A GB 2065769A GB 2065769 A GB2065769 A GB 2065769A GB 1207467 A GB1207467 A GB 1207467A
Authority
GB
United Kingdom
Prior art keywords
digits
relay
digital signal
signal transmission
transmission systems
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
GB2065769A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1207467A publication Critical patent/GB1207467A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/0096—Trunk circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)

Abstract

1,207,467. Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORP. 23 April, 1969 [26 April, 1968], No. 20657/69. Heading H4K. A junctor JR with a line transformer tr repeats by means of feed relay aa digits sent as loop-disconnect pulses, digits sent as D.C. leg codes being rented to a receiver CC which supplies battery to the line in place of relay aa but operates aa over a third winding to repeat the digits forward in loop-disconnect form. A slow-to-release relay Im operates with aa and falls back between digits, the speech path over transformer tr thus being available for receipt of supervisory tones between digits.
GB2065769A 1968-04-26 1969-04-23 Improvements to digital signal transmission systems in telecommunication exchanges Expired GB1207467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR149583 1968-04-26

Publications (1)

Publication Number Publication Date
GB1207467A true GB1207467A (en) 1970-10-07

Family

ID=8649449

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2065769A Expired GB1207467A (en) 1968-04-26 1969-04-23 Improvements to digital signal transmission systems in telecommunication exchanges

Country Status (6)

Country Link
AT (1) AT299320B (en)
DE (1) DE1920299A1 (en)
ES (1) ES366462A1 (en)
FR (1) FR1578883A (en)
GB (1) GB1207467A (en)
NL (1) NL6906382A (en)

Also Published As

Publication number Publication date
FR1578883A (en) 1969-08-22
AT299320B (en) 1972-06-12
ES366462A1 (en) 1971-03-16
NL6906382A (en) 1969-10-28
DE1920299A1 (en) 1969-11-06

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee