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

H - Electricity

04

M

H04M 11/00 (2006.01) H04L 12/26 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2073140

In a B-ISDN network including a number of subscriber systems, there is a requirement for controlling access competition among the various terminals of each subscriber system under the DQDB protocol. In a subscriber system, the terminals are electrically connected to a dual bus comprising a downbus and an upbus both extending from a network terminal. Each of the terminals has a data transmission processing unit, a downbus processing unit, an upbus processing unit, a timer and a failure detecting unit. When a data transmission request is issued from the data transmission processing unit, the failure detecting unit is activated in response to this request to start the timer so as to count a given time interval. If either a request message or data cannot be sent before the timer times out, then the failure detecting unit determines that a failure has occurred in the dual bus.

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