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