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3Com Router Module Guide
ACTIVE
3.8.4 Interface Cable
I. Interface cable of 2-port modules
2-port interface cables are G.703-compliant cables (referred to as E1 cables
throughout the rest part of the manual). E1 cables are divided into two types: 75-ohm
unbalanced coaxial cables and 120-ohm balanced twisted pair cables.
75-ohm unbalanced coaxial cable
Figure 3-40 E1 75-ohm unbalanced coaxial cable
Note:
You can select a pair of coaxial connectors with a BNC receptacle at both ends that connect two 75-ohm
unbalanced coaxial cables with BNC connectors. The coaxial connectors are used for the extension
connection with E1 75-ohm unbalanced coaxial cable.
120-ohm balanced twisted pair cable
At the router side, the connector of the cable is DB-15 (male); at the network side, the
connector is RJ-45, as illustrated in the following figure.
Figure 3-41 2-port 120-ohm balanced twisted pair cable
OFF means no data is being transmitted or received. ON means data is
being transmitted or received.
3-34
Chapter 3 Multifunctional Interface Modules
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