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84 CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES
For the pinouts of E1 cables, see Low-End and Mid-Range Series Routers Cable
Manual.
c
CAUTION: E1 cable, coaxial connector, network interface connector and 75-ohm
to 120-ohm adapter are all optional accessories. Please order them when
purchasing MIM-1E1/MIM-2E1 or MIM-1E1-F/MIM-2E1-F modules; by default,
they are not provided.
Conversion cable for MIM-4E1/MIM-4E1-F module
MIM-4E1/MIM-4E1-F modules provide two types of “1-to-4” conversion cables:
120-ohm 4E1 conversion cable and 75-ohm 4E1 conversion cable. At one end of
these two types of cables is a DB-25 connector used to connect a router, and at
the other end are four DB-15 connectors used to connect E1 cables. You can
distinguish these two types of cables by the main labels. There are the words
“MIM-4E1-120ohm-CAB” printed on the main label for 120-ohm 4E1 conversion
cables whereas the words “MIM-4E1-75ohm-CAB” are printed on the main label
for 75-ohm 4E1 conversion cables.
The two types of cables have a similar appearance, as illustrated in the following
figures. However, a 75-ohm 4E1 conversion cable uses 8-core coaxial cables but a
120-ohm 4E1 conversion cable uses four twisted pair cables.
Figure 94 120-ohm 4E1 conversion cable
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DB25¹
DB15Ä