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7.8.2
Operator Entered Switching Control Commands
The tributary card protection schemes all use operator commands to invoke protection
switching. In addition, there is an operator configurable option, which enables
automatic switching mode. The following operator entered switch commands apply,
however Trigger Restoration only applies when automatic switching is invoked:
Lockout of Protection
Traffic is either switched to, or maintained on the worker card(s). Any subsequent
failure does not cause traffic to switch to the protection card. The in-traffic indicator on
the protection card is extinguished.
Forced Switch to Protection
Traffic from the specified worker card is either switched to, or maintained on the
protection card regardless of whether the latter has failed. A subsequent failure of the
protection card, or any of the other workers, does not cause traffic to revert. The
in-traffic indicator on the worker is extinguished when a forced switch is in effect.
Clear
This clears the Lockout of Protection and Forced Switch to Protection operator
commands. It causes traffic (if switched to protection) to be switched back to the
worker.
Trigger Restoration
In automatic mode, this command causes traffic to be switched back to the worker if
the failed worker has recovered.
Note:
Note:
7.8.3
2Mbit/s 1:1 Core Tributary Protection (OMS 1240 only)
On the OMS 1240, the 1:1 core tributary protection scheme is available for the core
tributary LTU traffic.
Modes of operation, protection switching criteria, protection switching operation and
protection switching times, for core tributary protection are defined by the core card
protection scheme.
221 02-ZAP 701 25/1 Rev C 2006-08-04
03PHB00004AAV-CUA
This command does not cause traffic to be switched back to the worker if a
Forced Switch command is in effect. The only way of clearing a forced
switch is with a Clear command.
The protection state of the currently selected card is displayed to you.
Marconi OMS 1200
Technical Product Description
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