EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 693)

Glossary
SONET/SDH Application 679
Next-Gen - Link-Capacity Adjustment Scheme (LCAS)
LCAS Example 2: Capacity Reduction
There are two methods for LCAS to support the capacity reduction of a
VCG: automatic temporary removal of one or more member(s) due to a
network fault, or manual deprovisioning of one or more member(s) to
permanently reduce the bandwidth supported by the VCG.
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Automatic Temporary Removal
The temporary removal of a member is automatically handled by the
LCAS protocol, as presented in figure below and associated steps. This
capability provides VCAT with its resiliency mechanism as the size of
the group can be reduced temporarily, instead of taking the entire
group out of service (which would be the case for VCGs without LCAS
enabled). Once the defect is repaired, the group size can be restored to
full bandwidth without affecting the underlying service.
Bandwidth Reduction (Temporary Removal)