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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.

2-14

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Issue 3, May 2007

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Link Capacity Adjustment Scheme (Lcas) - Alcatel-Lucent 1643 AMS Applications And Planning Manual