3com 100 TX Manuel D’Utilisation

C

HAPTER

 3: M

AKING

 FMS 100-TX H

UB

 C

ONNECTIONS

Table 3-3 interprets the meaning of the hub operation LEDs.

The front panel unit digital display (see Figure 3-11) provides a numeric 
designation for each component in a hub stack, including a Management Unit 
if one is present. Unit numbers are assigned dynamically as the units are 
plugged into the stack. The Management Unit ID is assigned after the 
Power-On Self-Test (POST) has run. The number 1 indicates the device that has 
no other unit above it; in other words, the hub (or Management Unit) that is on 
the top of the stack and connected by a hub expansion cable to the 
component immediately below it. 

Figure 3-11   Unit Digital Display

Table 3-3   Hub Operation LEDs 

FAN FAIL

Amber

ON

One or both of the two internal fans 
have failed.

OVERTEMP

Amber

ON

The internal temperature exceeds 158

°

 F 

(70

°

 C).

COLLISION

Green

ON

The segment is experiencing collisions.

CLS II (Class II)

OFF

The FMS 100-TX Hub does not support 
Class II configuration. This LED is 
nonfunctional.

CLS I (Class I)

Green

ON

The FMS 100-TX Hub supports Class I 
configuration, which means that only 
one repeater or hub stack can be used 
between two end stations.

PWR (Power)

Green

ON

The hub is receiving power.

3C250-TX/

Ι

®