To guarantee service availability, these transmission protection mechanisms are supported by the 1643 AM/1643 AMS:
1+1 MSP on optical STM-1 line interfaces
The protection switching can be configured revertive and non-revertive as well as unidirectional and bidirectional (i.e. both directions of transmission are, respectively, switching separately or jointly). But the remote end of the Multiplex Section must support the necessary features for this operation.
Forced, manual and lockout switch commands are supported. The MSP implementation is compliant with the ITU-T Rec. G.841/Clause 7.1 and ETS 300417-3-1 (i.e. the APS protocol is optimized for 1:N protection). ETSI failure of protocol applies. Under this protocol also an alarm-free interworking mode with SONET defined MSP is supported.
The maximum switch completion time is 50 ms.
1+1 MSP on optical or electrical STM-1 tributary interfaces (1643 AM only)
The protection switching can be configured revertive and non-revertive and unidirectional and bidirectional (i.e. both directions of transmission are, respectively, switching separately or jointly), provided the remote end of the Multiplex Section supports the necessary features.
Forced, manual and lockout switch commands are supported. The MSP implementation is compliant with the ITU-T Rec. G.841/Clause 7.1 and ETS 300417-3-1 (i.e. the APS protocol is optimized for 1:N protection). ETSI failure of protocol applies. Under this protocol also an alarm-free interworking mode with SONET defined MSP is supported.
The maximum switch completion time is 50 ms.
VC-11 SNC/N protection (non-revertive)
A non-intrusively monitored subnetwork connection protection (SNC/N) relation can be set up between any arbitrary incoming TU-12 from the east aggregate and any arbitrary incoming TU-12 from the west aggregate line interface (VC-11s are mapped into TU-12s).
Only non-revertive operation is possible. Manual and forced switch commands are supported. In the return channel the signal is simply bridged to both outputs.
The maximum switch completion time is 50 ms.
VC-12 SNC/N protection (non-revertive)
A non-intrusively monitored subnetwork connection protection (SNC/N) relation can be set up between any arbitrary incoming TU-12 from the east aggregate and any arbitrary incoming TU-12 from the west aggregate line interface (VC-12s are mapped into TU-12s).
Only non-revertive operation is possible. Manual and forced switch commands are supported. In the return channel the signal is simply bridged to both outputs.
The maximum switch completion time is 50 ms.
Lower order VC-3 SNC/N protection (non-revertive)
A non-intrusively monitored subnetwork connection protection (SNC/N) relation can be set up between any arbitrary incoming TU-3 from the east aggregate and any arbitrary incoming TU-3 from the west aggregate line interface.
Only non-revertive operation is possible. Manual and forced switch commands are supported. In the return channel the signal is simply bridged to both outputs.
The maximum switch completion time is 50 ms.
Higher order VC-4 SNC/N protection (non-revertive)
In 1643 AM with STM-4 aggregates a non-intrusively monitored subnetwork connection protection (SNC/N) relation can be set up between any arbitrary incoming AU-4 from the east aggregate and any arbitrary incoming AU-4 from the west aggregate line interface.
Only non-revertive operation is possible. Manual and forced switch commands are supported. In the return channel the signal is simply bridged to both outputs.
The maximum switch completion time is 50 ms.
Alcatel-Lucent – Proprietary
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