6-5
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter6 Storage Access Networ king Cards
6.2.4 Interoperability Features (Enhanced Mode Only)
Insulation for FC switches from any SONET switchovers. No FC fabric reconvergences for SONET
failures of less than or equal to 60 ms.

6.2.4 Interoperability Features (Enhanced Mode Only)

The interoperability features are as follows:
Maximum frame size setting to prevent accumulation of oversize PMs for VSAN frames
Ingress filtering disable for attachment to third party GFP over SONET/SDH equipment

6.2.5 Link Integrity

The link integrity features are as follows:
Data port disabled if upstream data port is not able to send over SONET/SDH Transport
Data port disabled if SONET/SDH transport is errored

6.2.6 Link Recovery

Link recovery has the following features:
Reduces the impact of SONET/SDH disruptions on attached fiber channel equipment
Speeds up the recovery of Inter Switch Links (ISL)
Allows the monitoring of B2B credit depletion due to SONET outage and the full recovery of the
credits, thus preventing the slow decay of the bandwidth/throughput
Note Distance Extension and Link Recovery cannot be enabled at the same time.
6.3 FC_MR-4 Card Application
The FC_MR-4 card reliably transports a carrier-class, private-line Fibre Channel/FICON transport
service. Each FC_MR-4 card can support up to four 1-Gbps circuits or four 2-Gbps circuits. Four 1.06 25
Gbps FC channels can be mapped into containers as small as STS1 (subrate), with a minimum of
STS-24c/VC4-8c for full rate, and as large as STS48c/VC4-24c. Four 2.125 Gbps FC channels can be
mapped into containers as small as STS1 (sub-rate), with a minimum of STS48c/VC4-24c for full rate,
and as large as STS48c/VC4-24c.
The FC_MR-4 card incorporates features optimized for carrier-class applications such as:
Carrier-class Fibre Channel/FICON
50 ms of switch time through SONET/SDH protection as specified in Telcordia GR-253CORE
Hitless software upgrades
Remote Fibre Channel/FICON circuit bandwidth upgrades by means of integrated Cisco Transport
Controller (CTC)
Multiple management options through CTC, Cisco Transport Manager (CTM), TL1 (for SONET
only), and Simple Network Management Protocol (SNMP)