Alcatel-Lucent 1643 AMS User's Operation Manual page 396

Traffic provisioning
With LCAS enabled only signal degradation is caused
VC allocation (GbE)
There are 4 x VC-4 TTPs on the GbE card. Each of these can be substructured to
VC-3 TTPs or used as VC-4 TTPs. When the operator requests an SDH Channel/VCG
it has a choice of various capacities from a single VC-3 (50 Mbit/s) up to VC-4-4v
(600 Mbit/s). If the operator requires a bandwidth of say 100 Mbit/s, one of the VC-4
TTPs must be adapted into VC-3 TTPs, and two of these will be virtually concatenated
as a VC-3-2v. For the next SDH Channel/VCG the operator will then only have a
maximum bandwidth of 450 Mbit/s (VC-4-3v) as this is what is still available.
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8-44 Alcatel-Lucent - Proprietary
See notice on first page
Virtual concatenation
365-312-807R7.2
Issue 4, May 2007