3com TR User Manual

The cable topology rules for Token Ring are shown 
below:

The Switch 2000 TR automatically adjusts to the sup-
plied voltage. The fuse is suitable for either 90-110V 
A.C. or 220-240V A.C. A spare fuse is provided in the 
fuse drawer.

Refer to Figure 2-1 for the location of the fuse. When 
necessary, replace the Switch 2000 TR fuse with a 
fuse that has the following specifications:

■

Power down the Switch 2000 TR by removing the AC 
power cord or the Redundant Power System cords.

Gently pry open the fuse holder cover with a small 
flat-blade screwdriver.

Figure 2-1   Switch 2000 TR Fuse Location

Slide out the fuse holder drawer and remove the fuse.

Install the replacement fuse and close the fuse 
drawer.

Re-insert the power cord and apply power.

This section explains how to install the three optional 
modules into a SuperStack II Switch 2000 TR device. 
The modules are:

■

ATM

■

FDDI

■

TR-in-FE

Category 3 UTP

 660 ft/200m

330 ft/100m

Category 4, 5 UTP

 1,320 ft/400m

660 ft/200m

Type 1 STP

 2,000 ft/600m

1,000 ft/300m

Fuse location

AC connector