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Viewing Module Information 2-11
The 9A128-01 Module View
FDDI port status view options are:
Connection State
The Connection State port display form indicates the port’s connection status:
• CON (connecting): the port is trying to establish a link, but has not yet been
successful. Ports which are not connected and which have not been disabled
by management will display this status.
• ACT (active): the port has been enabled by management and has successfully
established a link.
• SBY (standby): the port has a physical link, but the SMT Connection Policy is
prohibiting a logical connection to the ring because the attempted connection
is illegal. FDDI protocol always forbids connecting two master ports; all other
connections are theoretically legal, although some are not desirable. You can
view the SMT Connection Policy by selecting the SMT Connection Policy
option from the FDDI menu; for more information, see Chapter 4, FDDI
Management.
• DIS (disabled): the port has been disabled by management; note that this
status does not indicate whether or not there is a physical link connected to the
port.
LER Estimate
The Link Error Rate (LER) Estimate port display form displays a cumulative long
term average of the bit error rate, which represents the quality of the physical link.
It is computed when the port is connected and every 10 seconds thereafter. The
value of the LER Estimate can range from 10
-4
to 10
-15
, but it is always displayed
as the absolute value of the exponent; for example, if the port’s LER Estimate is
computed to be 10
-5
, the value displayed in the Port Status box will be 5.0, which
represents an actual rate of 1,250 bit errors per second. The lower LER Estimate
numbers represent the highest bit error rates, as summarized in the figure below.
Figure 2-4. LER Estimate Values
.000000125
.00000125
.0000125
.000125
.00125
.0125
.125
1.25
12.5
125
1250
12500
456789101112131415
Bit Errors
per
Second
Reported LER Estimate