Cisco Systems 15327 SW-LCAS

5-3

Ethernet Card Software Feature and Configuration Guide, R7.2

January 2009

Chapter 5 Configuring POS

SW-LCAS

For step-by-step instructions on configuring an ML-Series card SONET VCAT circuit, refer to the

“Create Circuits and VT Tunnels” chapter of the Cisco ONS 15454 Procedure Guide. For step-by-step

instructions on configuring an ML-Series card SDH VCAT circuit, refer to the “Create Circuits and

Tunnels” chapter of the Cisco ONS 15454 SDH Procedure Guide. For more general information on

VCAT circuits, refer to the “Circuits and Tunnels” chapter of the Cisco ONS 15454 Reference Manual

or the Cisco ONS 15454 SDH Reference Manual.

Note ML-Series card POS interfaces normally send an alarm for signal label mismatch failure in the ONS

15454 STS path overhead (PDI-P) to the far end when the POS link g oes down or when RPR wraps.

ML-Series card POS interfaces do not send PDI-P to the far-end when PDI-P is detected, when a remote

defection indication alarm (RDI-P) is being sent to the far end, or when the only defects detected are

generic framing procedure (GFP)-loss of frame delineation (L FD), GFP client signal fail (CSF), virtual

concatenation (VCAT)-loss of multiframe (LOM), or VCAT-loss of sequence (SQM).

Note For nodes not connected by DCC (open ended nodes), VCAT must be configured through TL-1.

SW-LCAS

A link capacity adjustment scheme (LCAS) increases VCAT flexibility by allowing the dynamic

reconfiguration of VCAT groups without interrupting the operation of noninvolved members. Software

link capacity adjustment scheme (SW-LCAS) is the software implementation of a LCAS-type feature.

SW-LCAS differs from LCAS because it is not errorless and uses a different handshaking mechanism.

SW-LCAS on the ONS 15454 SONET/SDH ML-Series cards allows the automatic addition or removal

of a VCAT group member in the event of a failure or recovery on a two-fiber bidirectional line switched

ring (BLSR). The protection mechanism software operates based on ML-Series card link events.

SW-LCAS allows service providers to configure VCAT member circuits on the ML-Series as protection

channel access (PCA) circuits. This PCA traffic is dropped in the event of a protection switch, but is

suitable for excess or noncommited traffic and can double the total available bandwidth on the circuit.

For step-by-step instructions on configuring SW-LCAS, refer to the “Create Circuits and VT Tunnels”

chapter of the Cisco ONS 15454 Procedure Guide or the “Create Circuits and Tunnels” chapter of the

Cisco ONS 15454 SDH Procedure Guide. For more general information on SW-LCAS, refer to the

“Circuits and Tunnels” chapter of the Cisco ONS 15454 Reference Manual or the

Cisco ONS 15454 SDH Reference Manual.

Table 5-2 VCAT Circuit Sizes Supported by ML100T-12, ML100X-8, and ML1000-2 Cards

SONET VCAT Circuit Size SDH VCAT Circuit Size

STS-1-2v VC-3-2v

STS-3c-2v VC-4-2v

STS-12c-2v VC-4-4c-2v