| 摘要 |
A method is provided for defect recovery in Y-cable protected pair connections in communication systems. A receiver at a remote end monitors for loss of signal on the single fiber optic cable arriving at the remote end, and transmits an RDI back to the local end where it is detected by each of two receivers, one on an active card and one on a standby card. When a persistent RDI is detected by each receiver, transmission of content is flipped from the active transmitter to the standby transmitter, without performing a full APS. If RDIs are no longer received from the remote end, then the defect was likely in the single transmitter of the active card or the single optical fiber leading from the active card to the Y-junction, and the local end realizes that switching transmission to the standby card resolved the problem and a full APS is performed. The invention allows for quick recovery from defects in portions of the Y-cable communication system which may not otherwise be correctable, or even detectable, by conventional higher level fault recovery protocols.
|
