3Com Router Module Guide
Chapter 4
4-46
Figure 4-44
75-ohm 8E1 conversion cable
Figure 4-45
120-ohm conversion cable
4.12.5
Connecting the Interface Cable
Step 1: Choose a conversion cable appropriate to the interface type of the device to
be connected.
z
If the interface impedance of the device to be connected is 75-ohm, use a 75-ohm
4E1/8E1 conversion cable.
z
If the interface impedance of the device to be connected is 120-ohm, use a
120-ohm
4E1/8E1 conversion cable.
Step 2: Insert the DB-68 connector of the cable to the DB-68 port on the ROUTER
4-PORT E1 IMA FIC/ card, and fasten the cable fastening screws.