System for detecting failure in dual bus user network

Details System for detecting failure in dual bus user network System for detecting failure in dual bus user network

1992-07-06

1995-01-03

Canney, Vincent P.

Excavating

371 163, 371 201, H04J 312

Patent

active

053793072

ABSTRACT:
System for controlling access competition among a plurality of terminals under the DQDB protocol in a B-ISDN where the terminals are electrically connected to a dual bus with a downbus and an upbus extending from a network terminal. Each of the terminals has data transmission processor, downbus processor, upbus processor, a timer and failure detector. When data transmission request is issued from the data transmission processor, the failure detector is activated in response to a request to start the timer so as to count a given time interval which has elapsed. If either a request message or data cannot be sent even when the timer reaches a predetermined value, the failure detects signals that a failure has occurred in the dual bus.

REFERENCES:
patent: 4922244 (1990-05-01), Hullett et al.
patent: 5050166 (1991-09-01), Cantoni et al.
patent: 5051742 (1991-09-01), Hullett et al.
Fujiyama et al., "ATM Switching System Evolution and Implementation for B-ISDN," ICC '90, vol. 4, Apr. 1990, Atlanta, Ga., pp. 1577-1583.
Stock et al., "A Discrete Time Analysis of the DQDB Access Protocol with General Input Traffic," ITS '90, Sep. 1990, Rio de Janeiro, BR, pp. 121-126.

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