6-4
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter6 Storage Access Networking Cards
6.2.2 Enhanced Card Mode
6.2.2 Enhanced Card Mode
Features available in enhanced card mode are given in this section.

6.2.2.1 Mapping

1 Gbps Fibre Channel/FICON is mapped into:
SONET CCAT: STS1c, STS3c, STS6c, STS9c, STS12c, STS18c, STS24c, STS48c
SONET VCAT: STS3c-Nv (N is 1 to 8), STS1c-Nv (N is 1 to 24)
SDH CCAT: VC4-1c, VC4-2c, VC4-3c, VC4-4c, VC4-6c, VC4-8c, VC4-16c
SDH VCAT: VC4-Nv (N is 1 to 8)
2 Gbps Fibre Channel/FICON is mapped into:
SONET CCAT: STS1c, STS3c, STS6c, STS9c, STS12c, STS18c, STS24c, STS36c, STS48c
SONET VCAT: STS3c-Nv (N is 1 to 16), STS1c-Nv (N is 1 to 48)
SDH CCAT: VC4-1c, VC4-2c, VC4-3c, VC4-4c, VC4-6c, VC4-8c, VC4-12c, VC4-16c
SDH VCAT: VC4-16v (N is 1 to 16)

6.2.2.2 SW-LCAS

Virtual Concatenation Group (VCG) is reconfigurable with the software link capacity adjustment
scheme (SW-LCAS) enabled, as follows:
Out of service and out of group members can be removed from VCG
Members with deleted cross connect can be removed from VCG
Errored members can be autonomously removed from VCG
Degraded bandwidth VCGs are supported
VCG is flexible with SW-LCAS enabled (VCG can run traffic as soon as the first cross-connect is
provisioned on both sides of the transport)
6.2.3 Distance Extension (Enhanced Mode Only)
This following list describes FC_MR-4 card distance extension capabilities.
Enabling of SAN extension over long distances through buffer-to-buffer (B2B) credit spoofing.
2300 Km for 1G ports (longer distances supported with lesser throughput)
1150 Km for 2G ports (longer distances supported with lesser throughput)
Negotiation mechanism to identify if far end FC-over-SONET card supports Cisco proprietary B2B
mechanism.
Auto detection of FC switch B2B credits from FC-SW standards-based ELP frames.
Support for manual provisioning of credits based on FC switch cre dits.
Automatic GFP buffer adjustment based on roundtrip latency between two SL ports.
Automatic credit recovery during SONET switchovers/failures.