The VNswitch module monitors the number of link errors that occur over
its PHY port's link. The types of link errors it monitors includes, for example, line
state violations. The neighbor node connected to a link is disconnected from the network
if the error rate exceeds a number referred to as the cutoff value. You can set the cutoff
value that triggers disconnection of a neighbor node. The value is set independently for
each of the module's PHY ports. For example, the value for PHY port A is set independently
of the value for PHY port B on a DAS.
If the disconnection of a neighbor node is triggered, the FDDI network
establishes a loopback (wrap) onto the secondary ring at the node that initiated the
disconnect. The connection is automatically reestablished when the link is again active.
Note: Link error rate
is expressed as a negative exponential value of base 10. For example, an error rate of 10-4
is equal to 0.0001 bits per second, 10-5 is equal to 0.00001 bits per second,
and so on. |