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88 CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES
■ Connect its RJ-45 connector to the RJ-45 port on the device to be connected
directly, if cable extension is not needed.
■ 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.
Figure 98 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.
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;
■ 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).
■ 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 “Connecting interface cable of MIM-1E1/MIM-2E1 and
MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules” on page 87.
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.
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