GB921379A - Improvements in or relating to electronic telephone exchanges - Google Patents

Improvements in or relating to electronic telephone exchanges

Info

Publication number
GB921379A
GB921379A GB4305760A GB4305760A GB921379A GB 921379 A GB921379 A GB 921379A GB 4305760 A GB4305760 A GB 4305760A GB 4305760 A GB4305760 A GB 4305760A GB 921379 A GB921379 A GB 921379A
Authority
GB
United Kingdom
Prior art keywords
supervisory
circuit
gate
pulse
disables
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
GB4305760A
Inventor
Alfred Dargie Martin
John Dawson
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.)
Ericsson Telephones Ltd
Original Assignee
Ericsson Telephones 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
Priority to NL274941D priority Critical patent/NL274941A/xx
Application filed by Ericsson Telephones Ltd filed Critical Ericsson Telephones Ltd
Priority to GB4305760A priority patent/GB921379A/en
Priority to US178317A priority patent/US3161732A/en
Publication of GB921379A publication Critical patent/GB921379A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
    • H04Q3/545—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme
    • H04Q3/54541—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme using multi-processor systems
    • H04Q3/54558—Redundancy, stand-by
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
    • H04Q3/545—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme
    • H04Q3/54575—Software application
    • H04Q3/54591—Supervision, e.g. fault localisation, traffic measurements, avoiding errors, failure recovery, monitoring, statistical analysis

Abstract

921,379. Automatic exchange systems. ERICSSON TELEPHONES Ltd. Dec. 14, 1961 [Dec. 14, 1960], No. 43057/60. Class 40 (4). Supervisory apparatus is provided in duplicate, and if at any time one supervisory apparatus emits a pulse but not the other, then one supervisory apparatus is disabled so that only the other is operative in conjunction with the rest of the exchange and a routine test is applied to the operative supervisory apparatus. If the routine test shows up a fault then this supervisory apparatus is replaced by the other. As shown, Fig. 1, if supervisory circuit A emits a pulse unmatched by one from B gate 13A opens to set bi-stable circuit 16A which disables circuit A at gate 18A, and also disables gate 13B to prevent subsequent unmatched pulses from B disabling the latter circuit in a similar manner. In normal operation both outputs from A and B are accepted for use via OR gate 12A, 12B. Operation of 16A (or 16B) resets the continuously operating routine tester 20, Fig. 2, to the beginning of its cycle of tests which are then carried out in succession, each successful test causing the tester to step on to its next test. On a failure being detected the tester fails to step within a prescribed time, and a timer 22 causes an alarm to be given and applies a pulse to change over both bi-stable circuits 16A, 16B. This disables the faulty supervisory circuit and substitutes the other as described with reference to Fig. 1. The routiner then resumes its continuously running sequence on the system as then set up. The supervisory equipment may be involved in the setting up and release of calls and also in metering.
GB4305760A 1960-12-14 1960-12-14 Improvements in or relating to electronic telephone exchanges Expired GB921379A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL274941D NL274941A (en) 1960-12-14
GB4305760A GB921379A (en) 1960-12-14 1960-12-14 Improvements in or relating to electronic telephone exchanges
US178317A US3161732A (en) 1960-12-14 1962-03-08 Testing and control system for supervisory circuits in electronic telephone exchanges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4305760A GB921379A (en) 1960-12-14 1960-12-14 Improvements in or relating to electronic telephone exchanges

Publications (1)

Publication Number Publication Date
GB921379A true GB921379A (en) 1963-03-20

Family

ID=10427139

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4305760A Expired GB921379A (en) 1960-12-14 1960-12-14 Improvements in or relating to electronic telephone exchanges

Country Status (2)

Country Link
GB (1) GB921379A (en)
NL (1) NL274941A (en)

Also Published As

Publication number Publication date
NL274941A (en)

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