Bus optimizing method and communication node

Details Bus optimizing method and communication node Bus optimizing method and communication node

2002-07-23

2008-08-26

Backer, Firmin (Department: 2616)

Multiplex communications

Channel assignment techniques

Using time slots

C370S462000

Reexamination Certificate

active

07418005

ABSTRACT:
When a signal cable is connected between communication nodes0, 1which comply with a communication protocol that inhibits loop connection, communication node0detecting connection of the signal cable transmits a loop test signal LT having information of a port where connection was detected (e.g., information of a transfer rate between ports). In response to the loop test signal LT, a communication node2adds information of its own port that received the loop test signal LT, that is, P(2, 1), to the received loop test signal LT, and repeats the loop test signal LT. Similarly, communication node1adds information of its own port that received the loop test signal LT, that is, P(1, 0), to the loop test signal LT. Communication node0specifies a suitable disconnection point of a loop (e.g., a port having a low transfer rate between ports) based on the port information thus accumulated. Accordingly, even if a loop is formed accidentally, the disconnection point of the loop can be specified in view of the signal transfer efficiency on the network, and the port corresponding to the disconnection point can be logically disabled.

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“P1394b Draft Standard for a High Performance Serial Bus(Supplement)” The Institute of Electrical and Electronics Engineers, Inc., Feb. 25, 2000, pp. 180-183 and pp. 239-358.

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