Cabletron Systems 9A128-01 Manual De Usuario

Viewing Module Information

2-11

The 9A128-01 Module View

FDDI port status view options are:

The Connection State port display form indicates the port’s connection status: 

•

 (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.

•

(active): the port has been enabled by management and has successfully 

established a link.

•

(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

.

•

 (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.

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

4

5

6

7

8

9

10

11

12

13

14

15