EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 690)

Glossary
676 IQS-8100 Series Transport Blazer
Next-Gen - Link-Capacity Adjustment Scheme (LCAS)
Sink to Source: Depicted as Message [3] in figure LCAS Protocol
Transmission on page 674
Common LCAS Messages for Path [1] and [3]
MST Information from Sk to So about the status of all members of the
same VCG. It reports the member status from Sk to So with two
states: OK or FAIL (1 status bit per member). OK = 0, FAIL = 1.
Since each control packet contains only a limited number of bits
for communicating the MST field, this information is spread across
multiple control packets; i.e., an MST multiframe.
RS-Ack When a renumbering of the sequence numbers of the members
sending in CTRL field NORM, DNU, EOS, or when a change of the
number of these members is detected at the Sk, a notification to
the So per VCG has to be performed by toggling (i.e., change from
0 to 1 or from 1 to 0) the RS-Ack bit.
CRC-8 To simplify the variation of the changes in the virtual
concatenation overhead, a CRC is used to protect each control
packet. The CRC check is performed on every control packet after
it has been received, and the content is rejected if the test fails. If
the control packet passes the CRC test, then its content is used
immediately.