7705 SAR Interfaces
136
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
To prevent frequent automatic switches that result from intermittent failures, a
revert-time is defined for revertive switching. The revert-time is configurable from 0
to 60 min in increments of 1 min; the default value is 5 min. In some scenarios,
performance issues can occur if the revert-time is set to 0; therefore, it is
recommended that the revert-time always be set to a value of 1 or higher. Any
change in the revert-time value takes effect upon the next initiation of the
wait-to-restore (WTR) timer. The change does not modify the length of a WTR timer
that has already been started. The WTR timer of a non-revertive switch can be
assumed to be infinite.
If both working and protection lines fail, the line that has less-severe errors will be
active. If there is signal degradation on both ports, the active port that failed last will
stay active. If there is signal failure on both ports, the working port will always be
active because signal failure on the protection line is a higher priority than on the
working line.
3.2.15.6 APS Tools Commands
3.2.15.6.1 Lockout Protection
The lockout protection command (tools>perform>aps>lockout) disables use of the
protection line. Since the command has the highest priority, a failed working line
using the protection line is switched back to itself even if it is in a fault condition. No
switches to the protection line are allowed when the line is locked out. Refer to the
7705 SAR OAM and Diagnostics Guide, “Tools”, for information on the APS lockout
command.
3.2.15.6.2 Request Switch of Active to Protection
The request or manual switch of active to protection command
(tools>perform>aps> request) switches the active line to use the protection line (by
issuing a manual switch request) unless a request of equal or higher priority is
already in effect. If the active line is already on the protection line, no action takes
place. Refer to the 7705 SAR OAM and Diagnostics Guide, “Tools”, for information
on the APS request command.
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