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
Alcatel-Lucent – Proprietary
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