EXFO FTB-8510B Guia Del Usuario página 1331

Glossary
Next-Gen - Link-Capacity Adjustment Scheme (LCAS)
Restoration
Step 1: Fault clears
When the defect that caused the temporary removal is terminated
and is detected at the sink, the sink will start sending a MST = OK
for that member.
Upon detection of the MST = OK, the source will either replace the
DNU condition by an NORM condition, or replace the DNU
condition with an EOS condition, and the preceding member,
which was sending CTRL code EOS, will send NORM in the CTRL
field.
Step 2: Payload activation
The final step after recovering from a temporary removal is to start
using the payload area of that member again. The first container
frame to contain payload data for the member is the container
frame immediately following the container frame that contained
the last bit(s) of the control packet containing the first CTRL code
(NORM or EOS) in the CTRL field for that member.
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SONET/SDH Application