VC-12 concatenation
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Introduction
The concatenation of two VC-12s provides a mechanism to transport payloads greater
than the capacity of a single VC-12, for example to transport Ethernet data in SDH
networks. This feature is for the LAN tributary only.
A concatenated VC-12 group is indicated as VC-12-Xv. V means virtual concatenation.
Virtual concatenation
Virtual concatenation allows the transport of a single VC-12-xv structure in x
individual TU-12 without the use of any concatenation indication in the pointer bytes
(which is the case for contiguous concatenation). It only requires the path termination
function to provide concatenation functionality, hence guaranteeing interworking with
other standard low order connection functions.
Termination
VC-12 concatenation is only supported without termination. This means that only
VC-12 level cross connections can be made.
A VC-12-xv signal is handled like X individual VC-12 signals. The same alarms and
performance values are supported as for VC-12. The result of the VC-12-xv
supervision is copied into the X VC-12s.
• An alarm in an VC-12-xv group is displayed as one alarm for the entire group.
• X VC-12s can have different path and path trace.
Traffic provisioning
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-11
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