Determining the position of a bad link

Details Determining the position of a bad link Determining the position of a bad link

2003-11-24

2008-10-21

Ngo, Ricky (Department: 2616)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S242000

Reexamination Certificate

active

07440396

ABSTRACT:
A system for determining a bad link in a ring includes a start-up controller that transmits a link command having a position field holding initial value. Each device in the ring increments the value held in the position field of a received position command and transmits a modified position command having a position field holding an incremented value. If no valid position command is received at a device it transmits a modified position command having a position field holding the initial value. The start-up device compares the received value held in the position field of a received position command with an expected value to determine the existence and location of a bad link.

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