H3C Technologies H3C MSR 50 - Manual (Page 79)

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Figure 2-74 E1 G.703 120-ohm balanced twisted pair cable
120-ohm balanced twisted pair cable connects SIC-1VE1 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.
E1 cable, coaxial connector, network interface connector and 75ohm-to-120ohm adapter are optional.
Please order them together with SIC-1VE1. By default, they are not supplied.
Connecting the interface cable
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.
If the SIC has been properly installed, follow these steps to connect the cable:
Step1 Check the type of E1 cable and correctly set the DIP switch (the ex-factory setting of the interface
impedance is 75-ohm);
Step2 Connect the DB-15 connector of E1 cable to SIC-1VE1;
Step3 Connect the other end of the E1 cable to the corresponding network device:
1) When the E1 cable is a 75-ohm unbalanced coaxial cable:
z
Directly connect the BNC connector of the cable to the remote equipment if there is no need for
extension, or