If the TVX expires, the node starts a ring initialization sequence to restore the ring to proper operation. Each node is responsible for monitoring the integrity of the ring. By using the TVX, nodes can detect a break in ring activity. If the interval between token receptions exceeds the value of the TVX, the node reports an error condition and initiates the claim process to restore ring operation. If it cannot generate a token, the node that detected the problem initiates beacon frames.
Beacon frames indicate to the other nodes that the ring is broken.
If the ring does not return to normal operation in a specified period of time, RMT initiates a trace . A trace is a diagnostic function that isolates a fault on the ring. For more information about RMT, see the next section. FDDI SMT Bay Networks routers support Version 7.2 of the SMT protocol. SMT can run only on a single FDDI ring and can manage only the FDDI components and functions within a node.