Switching modes

Overview

The following 1+1 system switching modes are available:

• non-revertive (default)

• revertive

In non-revertive switching, a switch to the protection channel is maintained even after the working line has recovered from a failure or a manual switch is cleared.

In revertive switching, the traffic is switched back to the working channel after the working line has recovered from a failure or a manual switch is cleared.

For revertive switching, you can define a period of time that the system must wait before it can restore traffic from the protection line to the working line. This delay, or WTR time, prevents frequent automatic switches from occurring as a result of intermittent failures.

In case of failure on both the working and protection lines, the line that has the less severe error remains active. If there is a signal degradation on both lines, the active line that failed last remains active. If there is a signal failure on both lines, the working line always remains active because a signal failure on the protection line is a higher priority than a signal failure on the working line.