3Com 3C13886 Installation Guide - Page 32
Interface cables for ROUTER 1-PORT FRACTIONAL E1 SIC are standard E1 G.703,
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3Com Router Module Guide 2.4.6 Interface Cable Chapter 2 Smart Interface Cards 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 Enlarged A side Pos.1 DB15 Male A HUAWEI BNC connector Magnetic core Label Cable tie Pos.15 Hot-shrinkable tube 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 RJ-45 connector. 2-17