SIC-1EPRI/SIC-1E1-F 31

Interface Cable Interface cables for SIC-1EPRI/SIC-1E1-F 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:

75-ohm non-balanced coaxial cable

Figure 21 E1 G.703 75-ohm non-balanced coaxial cable

75-ohm non-balanced coaxial cable connects SIC-1EPRI/SIC-1E1-F with the DB-15 connector and the network end with the BNC connector.

n A pair of coaxial connectors is 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.

120-ohm balanced twisted pair cable

Figure 22 E1 G.703 120-ohm balanced twisted pair cable

120-ohm balanced twisted pair cable connects SIC-1EPRI/SIC-1E1-F with the DB-15 connector and network end with the RJ-45 connector.

 

A network interface connector is available for extending the E1 cable. Both ends

n of the connector are RJ-45 jacks that can be used to connect two 120-ohm

 

balanced twisted pair cables.

 

In addition, a 75-ohm to 120-ohm adapter is available.

 

For the pinouts of E1 cables, see Low-End and Mid-Range Series Routers Cable

 

Manual.

c

CAUTION: E1 cable, coaxial connector, network interface connector and

75ohm-to-120ohm adapter are optional. Please order them together with

 

SIC-1EPRI/SIC-1E1-F. By default, they are not supplied.

Connecting the Interface

Cable

c CAUTION: When using E1 cable outdoors, you are recommended to install a special lightning arrester on the input end of the cable in order to avoid lightning more effectively.

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3Com MSR 20, MSR 30, MSR 50 manual Balanced twisted pair cables, Addition, a 75-ohm to 120-ohm adapter is available, Manual