Multiplex communications – Wide area network – Packet switching
Patent
1985-11-27
1988-04-12
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
371 69, H04J 312
Patent
active
047379545
ABSTRACT:
The subscriber line signalling device (D) is employed in a digital telecommunications system. In particular the device (D) is used in a subscriber line interface module and it allows all signalling data to be detected and generated on a per-channel basis. A microprocessor (A) controls the device which generates and detects cyclically permutable code words on a plurality of traffic channel paths to or from the device. It is arranged that each generated cyclically permutable code word on any one traffic channel path is synchronously coded with respect to any other traffic channel path. The device can also be programmed to handle different data rates. In addition the operational modes of the traffic channels can be controlled giving loopback facilities allowing cyclically permutable code words to be generated and detected from the input and output traffic channels as desired and allow a diagnostic facility to be implemented.
REFERENCES:
patent: 3863215 (1975-01-01), McGrogan, Jr.
patent: 4004100 (1977-01-01), Takimoto
patent: 4302836 (1981-11-01), Bouvier d'Ivoire et al.
patent: 4413336 (1983-11-01), Chaillie et al.
patent: 4472811 (1984-09-01), Froggatt
Chin Stephen
Griffin Robert L.
Oglo Michael F.
Plessey Overseas Limited
Renfro Julian C.
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