2 fc_mr-4 utilization window, 3 fc_mr-4 history window – Cisco ONS 15454 SDH User Manual

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Cisco ONS 15454 SDH Reference Manual, R4.6

April 2008

Chapter 15 Performance Monitoring

15.7.1 FC_MR-4 Card Performance Monitoring Parameters FC_MR-4 Utilization Window

The Utilization window shows the percentage of transmit (Tx) and receive (Rx) line bandwidth used by
the ports during consecutive time segments. The Utilization window provides an Interval menu 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 15-62



Line utilization numbers express the average of ingress and egress traffic as a percentage of capacity. FC_MR-4 History Window

The History window lists past FC_MR-4 statistics for the previous time intervals. Depending on the
selected time interval, the History window displays the statistics for each port for the number of previous
time intervals as shown in

Table 15-63

. The listed parameters are defined in

Table 15-61 on page 15-55


Table 15-62 maxBaseRate for STS Circuits






850000000 x 2



For 1 G of bit rate being transported, there is only 850 Mbps of
actual data because of 8b->10b conversion. Similarly, for 2 G of bit
rate being transported there is only 850 Mbps x 2 of actual data.

Table 15-63 FC_MR-4 History Statistics per Time Interval

Time Interval

Number of Intervals Displayed

1 minute

60 previous time intervals

15 minutes

32 previous time intervals

1 hour

24 previous time intervals

1 day (24 hours)

7 previous time intervals