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124 CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES
Figure 140 E1 120-ohm balanced twisted pair cable
If the cable with the resistance of 75-ohm is needed, a 75-ohm-to-120-ohm cable
adapter (one end is BNC connector and the other end is RJ-45 connector) which is
illustrated in the following figure can be installed.
Figure 141 75-ohm-to-120-ohm adapter (with BNC connector)
For cable pinouts, see Low-End and Mid-Range Series Routers Cable Manual.
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■ For the convenience of extending the connection of E1 120-ohm balanced
twisted pair cable, you can use network interface connector.
■ E1 120-ohm balanced twisted pair cable, network interface connector,
75-ohm-to-120-ohm adapter are optional accessories. Please select one when
purchasing a MIM-1VE1 module; by default, they are not provided.
Connecting the Interface
Cable
c
CAUTION:
■ Some measures are taken to protect MIM-1VE1 module. Still, you are
recommended to install a special lightning arrester at the input end of its
connection cable to obtain better lightning protection when the cable is led
outdoors;
■ Read the mark identifying a port before you connect a cable to it, making sure
it is the correct port. Wrong connection tends to damage the MIM and even
the Router.
Step 1: Plug the DB-15 connector of the cable into the DB-15 port on the
MIM-1VE1 module and fasten the screws;
Step 2: Connect the RJ-45 connector of the cable to: