Datasheet

6-6
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 6 Storage Access Networking Cards
6.2.3 Link Integrity
6.2.2.5 Interoperability Features
The interoperability features are as follows:
• Maximum frame size setting to prevent accumulation of oversized performance monitoring (PM)
parameters for virtual SAN (VSAN) frames
• Ingress filtering disabled for attachment to third-party GFP-over-SONET/SDH equipment
6.2.3 Link Integrity
The link integrity features are as follows:
• The data port is disabled if the upstream data port is not able to send over SONET/SDH transport.
• The data port is disabled if SONET/SDH transport is errored.
6.2.4 Link Recovery
Link recovery has the following features:
• Reduces the impact of SONET/SDH disruptions on attached Fibre Channel equipment
• Speeds up the recovery of Inter-Switch Links (ISLs)
• 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 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
1.0625-Gbps FC channels can be mapped into containers as small as STS-1 (subrate), with a minimum
of STS-18c/VC4-6v for full rate. Four 2.125-Gbps FC channels can be mapped into containers as small
as STS-1 (subrate), with a minimum of STS-36c/VC4-12v for full rate.
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-253-CORE
Note Protection switch traffic hit times of less than 60 ms are not guaranteed with differential delay
in effect.
• Hitless software upgrades