GB954226A - Improvements in or relating to security arrangements for electrical systems - Google Patents

Improvements in or relating to security arrangements for electrical systems

Info

Publication number
GB954226A
GB954226A GB3816960A GB3816960A GB954226A GB 954226 A GB954226 A GB 954226A GB 3816960 A GB3816960 A GB 3816960A GB 3816960 A GB3816960 A GB 3816960A GB 954226 A GB954226 A GB 954226A
Authority
GB
United Kingdom
Prior art keywords
unit
checking circuit
gates
output
units
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
GB3816960A
Inventor
Lionel Roy Frank Harris
Charles Alan Maynard May
Ronald George Knight
David Gerald Bryan
Edward Arthur Richard Peddle
Robin Devenish Allum
Brian Desmond Simmons
Alfred Dargie Martin
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.)
Associated Electrical Industries Ltd
Automatic Telephone and Electric Co Ltd
Ericsson Telephones Ltd
General Electric Co PLC
Post Office
STC PLC
Original Assignee
Associated Electrical Industries Ltd
Automatic Telephone and Electric Co Ltd
Ericsson Telephones Ltd
General Electric Co PLC
Post Office
Standard Telephone and Cables PLC
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 Associated Electrical Industries Ltd, Automatic Telephone and Electric Co Ltd, Ericsson Telephones Ltd, General Electric Co PLC, Post Office, Standard Telephone and Cables PLC filed Critical Associated Electrical Industries Ltd
Priority to GB3816960A priority Critical patent/GB954226A/en
Publication of GB954226A publication Critical patent/GB954226A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Abstract

954,226. Automatic exchange systems. H.M. POSTMASTER GENERAL, STANDARD TELEPHONES & CABLES Ltd., GENERAL ELECTRIC CO. Ltd., AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd., ASSOCIATED ELECTRICAL INDUSTRIES Ltd., and ERICSSON TELEPHONES Ltd. Nov. 1, 1961 [Nov. 7, 1960], No. 38169/60. Heading H4K. [Also in Division G4] In a system for automatically detecting and replacing faulty functional units during a test period in which the units are idle, a continuous switching programme is carried out in which during first successive intervals ES1, ES2, ES3, Fig. 3, operational units E1, E2, E3 are replaced in turn by a spare unit ES, and in the following interval ES4, the spare unit is removed from channels IP1, OP1; IP2, OP2 and IP3, OP3, a test routine being applied by routiner RT. The switching is effected by means of gates EG1- EG3, ISG1-ISG3 and OSG1-OSG3. During each interval ES1-ES3 the units E1-E3 are connected in turn at instants t 1 , t 2 , t 3 with a checking circuit CHC through gates CG1-CG3, circuit CHC giving an output A if a fault is detected. Output A is used to stop the switching programme and cut out the faulty unit. Interval pulses ES1-ES3 are obtained from a counter CC1-CC4, Fig. 4, which is stepped on by pulses T. The arrangement of gates is such that on the occurrence of output A, pulses T are blocked at G1 and the counter is reset to the condition in which the trigger CC1-CC4 corresponding to the faulty unit is set. In another embodiment, Figs. 1, 2 (not shown) each unit E1-E3, ES has an individual checking circuit. Unit ES has an additional connection from IP1 through a gate which is opened at ES4 and its output, besides being connected to OP1-OP3 and its checking circuit through gates OSG1- OSG3, is also connected through a gate opened at ES4 to its checking circuit. In this way ES is continually tested by its checking circuit even during the intervals ES4 in which it is not conected in channels IP1, OP1-IP3, OP3.
GB3816960A 1960-11-07 1960-11-07 Improvements in or relating to security arrangements for electrical systems Expired GB954226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3816960A GB954226A (en) 1960-11-07 1960-11-07 Improvements in or relating to security arrangements for electrical systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3816960A GB954226A (en) 1960-11-07 1960-11-07 Improvements in or relating to security arrangements for electrical systems

Publications (1)

Publication Number Publication Date
GB954226A true GB954226A (en) 1964-04-02

Family

ID=10401697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3816960A Expired GB954226A (en) 1960-11-07 1960-11-07 Improvements in or relating to security arrangements for electrical systems

Country Status (1)

Country Link
GB (1) GB954226A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409877A (en) * 1964-11-27 1968-11-05 Bell Telephone Labor Inc Automatic maintenance arrangement for data processing systems
US3451042A (en) * 1964-10-14 1969-06-17 Westinghouse Electric Corp Redundant signal transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451042A (en) * 1964-10-14 1969-06-17 Westinghouse Electric Corp Redundant signal transmission system
US3409877A (en) * 1964-11-27 1968-11-05 Bell Telephone Labor Inc Automatic maintenance arrangement for data processing systems

Similar Documents

Publication Publication Date Title
CH539890A (en) Data processing system
GB1444318A (en) Matrix testing apparatus
GB1472924A (en) Telephone call simulator
US3161732A (en) Testing and control system for supervisory circuits in electronic telephone exchanges
GB954226A (en) Improvements in or relating to security arrangements for electrical systems
GB843225A (en) Improvements in or relating to electrical systems for determining the condition of electrical devices
GB1009545A (en) A circuit arrangement for testing lines in telecommunications and more especially telephone installations
GB1122472A (en) Systems for testing components of logic circuits
US3781482A (en) Pulse-correcting system for a telephone signaling system
GB1287137A (en) Monitoring apparatus for detecting faults in the line circuits of time division telephone exchanges
SE7708148L (en) METHOD AND DEVICE FOR FACILITATION OF FUNCTIONAL TESTS AND MISTAKE IN A SYSTEM WORKING ACCORDING TO THE TIME SHARING PRINCIPLE
JPS56122561A (en) Subscriber line concentration stage testing system
GB1078297A (en) Circuit arrangement for testing switching circuits and/or lines with regard to their engaged condition, in tele-communication systems, particularly in telephone exchange systems
JPS57202170A (en) Line selecting system
SU1029302A2 (en) Device for checking phase alternation in three-phase power network
JPS57145466A (en) Switchboard
ATE67914T1 (en) METHOD OF AUTOMATIC TESTING OF A COMMUNICATIONS SYSTEM, ESPECIALLY A TELEPHONE PBX.
JPS57136850A (en) Fault accepting and testing system
SU1444714A1 (en) Multichannel parameter monitoring device
SU1336006A1 (en) Signature analyzer
SU788399A1 (en) Device for quality control of communication channel
SU403100A1 (en) DEVICE TRANSFER OF DIGITAL INFORMATION
GB921379A (en) Improvements in or relating to electronic telephone exchanges
GB1490298A (en) Telecommunication exchanges
JPS57208758A (en) Test system