Alcatel-Lucent 1643 AMS User's Operation Manual page 700

Access multiplexer and access multiplexer small (formerly metropolis am and metropolis ams) release 1.0 through 7.2

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causing the old standby line, circuit pack, etc., to be used for the new active line, circuit

pack, etc. The original active line, circuit pack, etc., becomes the standby line, circuit

pack, etc. This status remains in effect when the fault clears. Therefore, this protection

scheme is "non-revertive" in that there is no switch back to the original status in effect

before the fault occurred.

Non-revertive switching

In non-revertive switching there is an active and a standby high speed line, circuit pack,

etc. When a protection switch occurs, the standby line, circuit pack, etc. is selected

which causes the old standby line, circuit pack, etc, to be used for the new active line,

circuit pack, etc. The original active line, circuit pack, etc. becomes the standby line,

circuit pack, etc. This status remains in effect when the faults clears. Therefore, this

protection scheme is non-revertive in that there is no switch back to the original status

that was in effect before the fault occurred.

Non-synchronous

The essential characteristic of timescales or signals such that their significant instants do

not necessarily occur at the same average rate.

Not Protected Domain

The Not Protected Domain for the ITM-SC contains all the network elements that are

managed by that ITM-SC and are not currently protected by another ITM-SC. If the

ITM-SC fails, the network elements in this domain are not managed by any ITM-SC.

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