H3C Technologies H3C MSR 50 - Manual (Page 39)

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75-ohm unbalanced coaxial cable
Figure 2-18 E1 G.703 75-ohm unbalanced coaxial cable
75-ohm unbalanced coaxial cable connects SIC-EPRI with the DB-15 connector and the network end
with the BNC connector.
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 unbalanced coaxial cables with BNC
connectors.
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120-ohm balanced twisted pair cable
Figure 2-19 E1 G.703 120-ohm balanced twisted pair cable
120-ohm balanced twisted pair cable connects SIC-EPRI 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 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.