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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 3 Multifunctional Interface Modules
3-22
For the pinouts of E1 cables, see
Low-End and Mid-Range Series Routers Cable
Manual
.
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.
II. 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.
HU
AW
EI
HU
AWEI
HU
AW
EI
HU
AW
EI
DB25
݀
DB15
↡
Figure 3-32
120-ohm 4E1 conversion cable