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Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 15 Performance Monitoring
15.9 15.9.2 FC_MR-4 Utilization Window
15.9.2 FC_MR-4 Utilization Window
The Utilization window shows the percentage of Tx and Rx line bandwidth used by the ports during
consecutive time segments. The Utilization window provides an Interval drop-down list that enables you
to set time intervals of 1 minute, 15 minutes, 1 hour, and 1 day. Line utilization is calculated with the
following formulas:
Rx = (inOctets + inPkts * 24) * 8 / 100% interval * maxBaseRate
Tx = (outOctets + outPkts * 24) * 8 / 100% interval * maxBaseRate
The interval is defined in seconds. The maxBaseRate is defined by raw bits per second in one direction
for the port (that is, 1 Gbps or 2 Gbps). The maxBaseRate for FC_MR-4 cards is shown in Table 15-27.
Note Line utilization numbers express the average of ingress and egress traffic as a percentage of capacity.
mediaIndStatsTxFramesBadCRC Number of Fibre Channel frames transmitted with
bad CRC.
fcStatsLinkRecoveries Number of link recoveries.
fcStatsRxCredits Number of buffers received to buffer credits T
(valid only if distance extension is enable).
fcStatsTxCredits Number of buffers transmitted to buffer credits T
(valid only if distance extension is enable).
fcStatsZeroTxCredits Number of transmit attempts that failed because
of unavailable credits.
8b10bInvalidOrderedSets 8b10b loss of sync count on Fibre Channel line
side.
8b10bStatsEncodingDispErrors 8b10b disparity violations count on Fibre Channel
line side.
gfpStatsCSFRaised Number of GFP Client Signal Fail frames
detected.
Table 15-26 FC_MR-4 Card Statistics
Parameter Definition
Table 15-27 maxBaseRate for STS Circuits
STS maxBaseRate
STS-24 850000000
STS-48 850000000 x 2
1
1. For 1 Gbps of bit rate being transported, there are only 850 Mbps of actual data
because of 8b->10b conversion. Similarly, for 2 Gbps of bit rate being transported,
there are only 1700 Mbps (850 Mbps x 2) of actual data.
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