Recovery From Transmission Medium Failures in a Ring
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
This article describes an apparatus and method for automatic recovery from a fault occurring in a segment of a ring or a loop communication system. The ring or loop communication system is fitted with a backup ring. Electrical signals are forced to travel on the backup ring in a direction opposite to the direction in which signals are propagated on a prime ring. When a ring wiring concentrator (RWC) detects an outage on its upstream segment of the prime ring, the ring wiring concentrator connects the backup ring to the prime ring on the upstream side of the RWC. This causes the signal transmission on the backup ring to be discontinued, thereby alerting the upstream RWC. The alerted ring wiring concentrator then connects the prime ring to the backup ring. The new configuration enables normal ring operation.