Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 2 Smart Interface Cards
2-13
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.
Note:
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
.
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.
2.3.6 Connecting the Interface Cable
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.
If the SIC has been properly installed, follow these steps to connect the cable:
Step 1: Check the type of E1 cable and correctly set the DIP switch (the ex-factory
setting of E1/CE1/PRI interface impedance is 75-ohm);
Step 2: Connect the DB-15 connector of E1 cable to SIC-1EPRI/SIC-1E1-F;
Step 3: 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
