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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 2 Smart Interface Cards
2-17
2.4.6 Interface Cable
Interface cables for Router 1-Port Fractional E1 SIC are standard E1 G.703 cables. E1
G.703 cables have two types: 75-ohm non-balanced coaxial cables and 120-ohm
balanced twisted pair cables, shown as follows:
z 75-ohm non-balanced coaxial cable
HUAWEI
BNC connector
Cable tie
Label
Magnetic core
Hot-shrinkable tube
DB15 Male
Enlarged A side
Pos.1
Pos.15
A
Figure 2-16 E1 G.703 75-ohm non-balanced coaxial cable
75-ohm non-balanced coaxial cable connects Router 1-Port Fractional E1 SIC with the
DB15 connector and the network end with the BNC connector.
Note:
A pair of coaxial connectors are available for extending the E1 cable. Both ends of the connectors are
BNC receptacles that can be used to connect two 75-ohm non-balanced coaxial cables with BNC
connectors.
z 120-ohm balanced twisted pair cable
Figure 2-17 E1 G.703 120-ohm balanced twisted pair cable
120-ohm balanced twisted pair cable connects Router 1-Port Fractional E1 SIC with
the DB15 connector and network end with the RJ45 connector.