GB954226A - Improvements in or relating to security arrangements for electrical systems - Google Patents
Improvements in or relating to security arrangements for electrical systemsInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Medicinal Preparation (AREA)
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.
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)
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 |
-
1960
- 1960-11-07 GB GB3816960A patent/GB954226A/en not_active Expired
Cited By (2)
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 |
---|---|---|
FR1568070A (en) | ||
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 | |
US3781482A (en) | Pulse-correcting system for a telephone signaling system | |
GB1031788A (en) | Improvements in or relating to telecommunications exchange systems | |
JPS5713567A (en) | Multiprocessor 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 | |
ATE67914T1 (en) | METHOD OF AUTOMATIC TESTING OF A COMMUNICATIONS SYSTEM, ESPECIALLY A TELEPHONE PBX. | |
GB1235302A (en) | Monitoring arrangement for telephone systems | |
JPS57136850A (en) | Fault accepting and testing system | |
US4278849A (en) | Test arrangement for automatic number identification systems | |
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 | |
GB1105507A (en) | Automatic testing circuit for switching systems | |
SU1721829A1 (en) | Automatic channel controller | |
GB921379A (en) | Improvements in or relating to electronic telephone exchanges |