3com 100 TX Manual De Usuario

C

HAPTER

 3: M

AKING

 FMS 100-TX H

UB

 C

ONNECTIONS

A Class II repeater is a hub with internal delay such that no more than two 
hubs can exist between any two DTE devices within a single collision domain 
when two maximum-length cable segments are used. The Class II network 
topology allows two hubs (or hub stacks) to exist between any two end 
stations. 

Figure 3-9 shows a two-repeater collision domain containing two hubs 
between two end stations that are located 205 meters apart. This is the total 
allowable span for UTP cable. 

Figure 3-9   Class II Hubs

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Class II configuration

205 meters: maximum UTP distance

5 meters maximum

100 meters maximum

100 meters maximum