Technical data

FDDI Port ConÞguration View
Port Management
ConÞguration Views NBR-620, NBR-420 and NBR-220
3-6 Management Module Guide
Port Type
The type of port. Possible port types are: A_Port, B_Port, Slave, or Master.
Port Class
The class of the port. Possible states are: multi-mode, single-mode1,
single-mode2, sonet, low-cost Þber, and twisted pair.
Link Error Rate Estimate
The link error rate estimate is a cumulative long-term average of the bit error
rate, which represents the quality of the physical link. The link error rate
estimate is computed when the port is connected and every 10 seconds
thereafter. It ranges from 10
-4
to 10
-15
and is reported as a whole integer. For
example, if the portÕs link error rate estimate is computed to be 10
-5
, the value
reported in this Þeld would be 5, which represents an actual rate of 1,250 bit
errors per second. A lower link error rate estimate indicates a higher bit error
rate as shown in Figure 3-1.
Figure 3-1. Link Error Rate Estimate
Link Error Monitor Count
The aggregate link error monitor count. This count is set to zero on station
power up and increments each time the portÕs link error monitor detects an
error. An increasing link error monitor count usually indicates a problem with
the connectors or the cable between this port and the node.
Link Error Rate Cutoff
The link error rate threshold at which a link connection is ßagged as faulty
and the port disabled by SMT. The default link error rate cutoff threshold is 7,
............................................... ............................................... ...............................................
...............................................
............................................... ...............................................
...............................................
............................................... ............................................... ............................................... ............................................... ...............................................
.000000125
.00000125
.0000125
.000125
.00125
.0125
.125
1.25
12.5
125
1250
12500
4 5 6 7 8 9 10 11 12 13 14 15
Bit Errors
per Second
Reported Link Error Rate Estimate (n)