Ring Fault Recovery in a Bidirectional Insertion Ring
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
This article describes a technique for ring fault recovery in a bidirectional insertion ring using the wrap operation method. A local area network, such as the one disclosed in the preceding article, allows for high availability via the use of two rings which transmit data in opposite directions. When a fault occurs, the system operations port (SOP) is notified of the fault and will take the appropriate steps to circumvent the problem completely without software intervention. A fault, as described herein, refers to an error which cannot be corrected via retries, such as a severed ring, but which may be circumvented by alternate pathing. (Image Omitted) Alternate pathing can be accomplished via two methods. One method is to terminate operation on the ring that has had the fault (i.e., single-ring operation).