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MIM-IMA-4E1/MIM-IMA-8E1 Module 133
75-ohm 4E1 conversion cable contains eight coaxial cables, and the 120-ohm 4E1
conversion cable contains four twisted pairs.
The MIM-IMA-8E1 module provides eight E1 ports and adopts a 120-ohm or a
75-ohm 8E1 conversion cable. The two types of 8E1 conversion cables look similar.
Both of them have a DB68 connector at one end for connecting the router.
However, the 75-ohm 8E1 conversion cable contains 16 coaxial cables and the
120-ohm 8E1 conversion cable contains eight twisted pairs, as shown in the
following figures:
Figure 150 120-ohm 8E1 conversion cable
Figure 151 75-ohm 8E1 conversion cable
Connecting the Interface
Cable
Follow these steps to connect the MIM-IMA-4E1/ MIM-IMA-8E1 interface cable.
Step 1: Choose a 4E1/8E1 conversion cable appropriate to the interface type of
the peer device to be connected.
■ If the interface impedance of the peer device is 75 ohm, use a 75-ohm 4E1/8E1
conversion cable.
■ If the interface impedance of the peer device is 120 ohm, use a 120-ohm
4E1/8E1 conversion cable.