EXFO FTB-8510B Guia Del Usuario página 1333

Glossary
Next-Gen - Link-Capacity Adjustment Scheme (LCAS)
Step 2: At the source, the management system deletes the
member from the VCG.
The CTRL field is set to IDLE, while the SQ is automatically set to
255.
Depending on which member is deleted in the VCG, the SQ for the
remaining members may be renumbered. For example, if the
member that is removed is the highest number in the VCG, the
members' SQs will not be renumbered. However, if a member
other than the last is removed, then SQ renumbering will occur in
line with the new order.
The source will send a new CTRL word (changed from NORM to
EOS) for the last member of the VCG.
Step 3: At the sink, the CTRL word and SQ are received.
When the CTRL = IDLE signal is detected, the MST for the member
is set to FAIL and the RS-Ack is toggled.
Step 4: At the sink, the management system deletes the member
from the VCG.
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SONET/SDH Application