GB1478254A - Test sender circuit for telecommunications exchanges - Google Patents

Test sender circuit for telecommunications exchanges

Info

Publication number
GB1478254A
GB1478254A GB2768475A GB2768475A GB1478254A GB 1478254 A GB1478254 A GB 1478254A GB 2768475 A GB2768475 A GB 2768475A GB 2768475 A GB2768475 A GB 2768475A GB 1478254 A GB1478254 A GB 1478254A
Authority
GB
United Kingdom
Prior art keywords
junction
test circuit
seized
exchange
call
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
GB2768475A
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 GB1478254A publication Critical patent/GB1478254A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

1478254 Automatic exchange systems INTERNATIONAL STANDARD ELECTRIC CORP 1 July 1975 [9 July 1974] 27684/75 Heading H4P An automatic telecommunication exchange includes registers, one of which is seized for use for each call set up by a subscriber, and a junction over which outgoing calls are extended to a remote exchange; if a predetermined period elapses without the receipt of a call confirmation signal from the remote exchange, the seized register makes a number of attempts for a preset period to complete the call over the same junction, but if these attempts fail a commonly available test circuit is seized and connected to the junction, whereafter the register is disconnected from that junction and thus becomes available for other calls. The test circuit then emits a succession of signals over the junction in an attempt to stimulate a response from the remote exchange; if these attempts succeed, indicating that the initial failure of the call confirmation signal to arrive was due to a transient fault, the junction and the test circuit are both released. If, however, after a predetermined period no response is received the junction is set to its alarm condition in which it is unavailable for use and is signalled as faulty, the test circuit then being released.
GB2768475A 1974-07-09 1975-07-01 Test sender circuit for telecommunications exchanges Expired GB1478254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES428095A ES428095A1 (en) 1974-07-09 1974-07-09 Test sender circuit for telecommunications exchanges

Publications (1)

Publication Number Publication Date
GB1478254A true GB1478254A (en) 1977-06-29

Family

ID=8467113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2768475A Expired GB1478254A (en) 1974-07-09 1975-07-01 Test sender circuit for telecommunications exchanges

Country Status (2)

Country Link
ES (1) ES428095A1 (en)
GB (1) GB1478254A (en)

Also Published As

Publication number Publication date
ES428095A1 (en) 1976-09-01

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee