Communication path continuity verification arrangement

Details Communication path continuity verification arrangement Communication path continuity verification arrangement

1982-12-08

1985-02-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 314, H04M 322

Patent

active

045009856

ABSTRACT:
A number of communication units are connected to a time-multiplexed switch via communication links. Control messages are conveyed among the communication units and a central control whereby paths are established through the time-multiplexed switch from originating communication units to terminating communication units. One of the control messages conveyed to a terminating communication unit during call setup includes a link identifier defining the communication link between the originating communication unit and the time-multiplexed switch. In accordance with the present invention, when the originating communication unit begins transmitting data words, one bit position of each data word is used to transmit consecutive bits of the link identifier so that the link identifier is transmitted repetitively every fixed number of frames. The terminating communication unit monitors the received link identifier and autonomously initiates fault recovery when the received link identifier does not agree with that included in the control message received during call setup.

REFERENCES:
patent: 3647979 (1972-03-01), Rubin
patent: 3808380 (1974-04-01), Fallon
patent: 3937935 (1976-02-01), Le Pabic
patent: 4022979 (1977-05-01), Smith
patent: 4024359 (1977-05-01), De Marco et al.
patent: 4048445 (1977-09-01), Ghisler
patent: 4296492 (1981-10-01), Hafer
patent: 4345324 (1982-08-01), Smitt

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