Communications network

Details Communications network Communications network

1985-11-29

1987-09-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

34082508, H04J 316

Patent

active

046929193

ABSTRACT:
In order to prevent a communications failure in a communications network wherein many terminals share a common communications channel or bus and respond to a network controller over the communications bus to enable the terminals to have access to the bus sequentially and for predetermined intervals, the command which enables the terminal to transmit is connected to an "anti-babbling" circuit which processes the enabling command and prevents the terminal from transmitting its local messages onto the bus when the enabling command does not conform to either of two critical communication protocol timing parameters. Thus, if the enabling command extends longer than the predetermined interval, or occurs at a frequency higher than the predetermined frequency required for normal communication, the "anti-babbling" circuit times-out and causes the terminal to stop transmitting. Only the terminal affected by the failure is disabled and the rest of the communications network, including the other terminals, can continue to operate.

REFERENCES:
patent: 4162483 (1979-07-01), Entenman
patent: 4435706 (1984-03-01), Callan
patent: 4586040 (1986-04-01), Akiba et al.

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