Transmission protection
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Supported protection mechanisms
To guarantee service availability, these transmission protection mechanisms are
supported by the 1643 AM / 1643 AMS:
• Multiplex Section Protection (MSP)
– 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.
• Subnetwork Connection Protection (SNCP)
– 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.
Features
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365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
2-11
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