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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 3 Multifunctional Interface Modules
3-26
Step 3: Connect the other end of the E1 cable to the network device;
1) When using 75-ohm unbalanced coaxial cable,
z
Connect its BNC connector to the device to be connected directly, if cable
extension is not needed;
z
Connect its BNC connector to a coaxial connector and the other end of the coaxial
connector to the device to be connected through a 75-ohm E1 trunk cable, if cable
extension is needed;
Caution:
Connect the local Tx wire in the E1 cable to the remote Rx wire and the local Rx wire to
the remote Tx wire.
Router
Network
devices
such as DDN
DB-15
Coaxial connector
BNC
BNC
75-ohm non-balanced coaxial cable
75-ohm E1 trunk cable
Figure 3-35
Extending an E1 75-ohm unbalanced coaxial cable
z
If the port on the network device to be connected has a 120-ohm port, use a
75-ohm to 120-ohm adapter, or use a 120-ohm cable instead.
2) When using a 120-ohm balanced twisted pair cable,
z
Connect its RJ-45 connector to the RJ-45 port on the device to be connected
directly, if cable extension is not needed.
z
Connect its RJ-45 connector to a network interface connector and then the other
end of the network interface connector to the network device to be connected
through a 120-ohm E1 trunk cable, if cable extension is needed.