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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 3 Multifunctional Interface Modules
3-27
Router
Network
devices such
as DDN
DB-15
Network interface connector
RJ-45
RJ-45
120-ohm balanced twisted pair
120-ohm E1 trunk cable
Figure 3-36
Extending an E1 120-ohm balanced twisted pair cable
Step 4: Check the behavior of the LINK LED on the module panel. It is OFF when fault
has occurred on the link and signal is out of synchronization. In this case, please check
the link.
II. Connecting interface cable of MIM-4E1/MIM-4E1-F
Step 1: Select the appropriate 4E1 cable and E1 cable according to type of the port on
the remote device, and set DIP switches of MIM-4E1 or MIM-4E1-F module correctly;
z
If the resistance of the port on the device to be connected is 75-ohm, select a
75-ohm E1 non-balanced coaxial cable and a 75-ohm 4E1 conversion cable, and
set all the DIP switches on the MIM-4E1/MIM-4E1-F module to “ON” (that is, the
port resistance is 75-ohm).
z
If the resistance of the port on the device to be connected is 120-ohm, select a
120-ohm E1 balanced twisted pair cable and a 120-ohm 4E1 conversion cable,
and set all the DIP switches on the MIM-4E1/MIM-4E1-F module to “OFF” (that is,
the port resistance is 120-ohm).
Step 2: Plug the DB-25 connector of the 4E1 conversion cable into a DB-25 port on
MIM-4E1 or MIM-4E1-F module, and tighten the screws;
Step 3: Connect the DB-15 connector of the 4E1 conversion cable to the E1 cable,
making sure of wire sequence of the connector;
Step 4: Connect the E1 cable to the device to be connected. For the procedures, see
the previous subsection
I.
“
Connecting interface cable of MIM-1E1/MIM-2E1 and
MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules
”;
Step 5: Check the behavior of the LINK LED on the module panel. It is OFF when fault
has occurred on the link and signal is out of synchronization. In this case, please check
the link.