Link Capacity Adjustment Scheme (LCAS)
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LCAS
The X8PL and X5IP option cards for Ethernet private line applications support the
Link Capacity Adjustment Scheme (LCAS).
LCAS defines a synchronization protocol between two termination points of a virtual
concatenated path that allows in-service dynamic sizing of the VCn-Xv bandwidth that
is available for Ethernet-over-SDH transmission. This bandwidth change can occur
either in response to a failure condition on one member or a requirement for a change
in bandwidth at an NE (provisioning action).
In the case of a failure, the bandwidth will be restored automatically after the failure
clears. The size of the VCn-Xv is increased or decreased in steps of one VCn. The
provisioning is performed by adding/removing paths to/from the Ethernet tributary
card.
The LCAS feature is supported for VC3-Xv and VC12-Xv.
The X5IP option card supports the latest LCAS standards as per ITU-Ts G.806 at
2006.3 and G.7042 at 2005.5 recommendations. The following enhancements are
implemented.
• G.806 at 2006.3: modified defect and alarm correlation process; hold-off timer is
now part of the defect-alarm process
• G.7042 at 2005.5: error corrections implemented.
Features
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2-14
Alcatel-Lucent - Proprietary
See notice on first page
365-312-801R7.2
Issue 3, May 2007
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