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GB1102480A - Improvements in or relating to telephone exchange systems - Google Patents

Improvements in or relating to telephone exchange systems

Info

Publication number
GB1102480A
GB1102480A GB3969965A GB3969965A GB1102480A GB 1102480 A GB1102480 A GB 1102480A GB 3969965 A GB3969965 A GB 3969965A GB 3969965 A GB3969965 A GB 3969965A GB 1102480 A GB1102480 A GB 1102480A
Authority
GB
United Kingdom
Prior art keywords
wire
junction
relay
incoming
junctions
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
GB3969965A
Inventor
Leslie James Browell
John Henry Keating
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB3969965A priority Critical patent/GB1102480A/en
Publication of GB1102480A publication Critical patent/GB1102480A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,102,480. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. 12 Sept., 1966 [17 Sept., 1965], No. 39699/65. Heading H4K. In a system employing cross-barswitches operating on the self-steering principle, such as that described in Specification 890,235, bothway junctions are provided and the relay sets terminating such junctions are arranged to avoid " clash " between incoming and outgoing calls and to give preference to the former. Idle junctions are marked by negative potential on wire RR. When a junction is selected by a junction marker JMKR for use on an outgoing call, connections are made over the switch train to the relay group BWRG, and relay K energizes over the P wire, followed by switching relay JG, the junction BWJ being disconnected from the incoming transmission group ITRG. On an incoming call, relay PK is energized from ITRG and connects up K in a local circuit, thus completing a direct incoming path independent of rectifiers MR1, MR2. If, however, the junction has already been selected for an outgoing call, the operation of K is delayed by earth on wire KS and the earth on the P wire is diverted over wire BW to JMKR to initiate the selection of a fresh junction. The removal of earth from wire KS allows K to operate.
GB3969965A 1965-09-17 1965-09-17 Improvements in or relating to telephone exchange systems Expired GB1102480A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3969965A GB1102480A (en) 1965-09-17 1965-09-17 Improvements in or relating to telephone exchange systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3969965A GB1102480A (en) 1965-09-17 1965-09-17 Improvements in or relating to telephone exchange systems

Publications (1)

Publication Number Publication Date
GB1102480A true GB1102480A (en) 1968-02-07

Family

ID=10410991

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3969965A Expired GB1102480A (en) 1965-09-17 1965-09-17 Improvements in or relating to telephone exchange systems

Country Status (1)

Country Link
GB (1) GB1102480A (en)

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