Datasheet

15-20
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 15 Performance Monitoring
15.6.1 E-Series Ethernet Card Performance Monitoring Parameters
15.6.1.2 E-Series Ethernet Utilization Window
The Utilization window shows the percentage of transmit (Tx) and receive (Rx) line bandwidth used by
the Ethernet ports during consecutive time segments. The Mode field displays the real-time mode status,
such as “100 Full,” which is the mode setting configured on the E-Series port. However, if the E-Series
port is set to autonegotiate the mode (Auto), this field shows the result of the link negotiation between
the E-Series and the peer Ethernet device attached directly to the E-Series port.
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 * 20) * 8 / 100% interval * maxBaseRate
Tx = (outOctets + outPkts * 20) * 8 / 100% interval * maxBaseRate
The interval is defined in seconds. The maxBaseRate is defined by raw bits per second in one direction
for the Ethernet port (that is, 1 Gbps). STS circuit maxBaseRates are shown in Table 15-8.
Note Line utilization numbers express the average of ingress and egress traffic as a percentage of capacity.
Note The E-Series Ethernet card is a Layer 2 device or switch and supports Trunk Utilization statistics. The
Trunk Utilization statistics are similar to the Line Utilization statistics, but shows the percentage of
circuit bandwidth used rather than the percentage of line bandwidth used. The Trunk Utilization statistics
are accessed through the card view Maintenance tab.
15.6.1.3 E-Series Ethernet History Window
The Ethernet History window lists past Ethernet 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 15-9. The parameters are defined in Table 15-7 on page 15-19.
Tx Excessive Collisions Number of consecutive collisions.
Tx Deferred Number of packets deferred.
Table 15-7 E-Series Ethernet Statistics Parameters (continued)
Parameter Meaning
Table 15-8 MaxBaseRate for VC Circuits
STS maxBaseRate
VC3 51840000
VC4 155000000
VC42C 311000000
VC44C 622000000