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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 3
Multifunctional Interface Modules (Router 5000)
3-10
Figure 3-14 75-ohm-to120-ohm adapter (with BNC connector)
Caution:
z For the convenience of extending the connection of E1 120-ohm balanced twisted pair cable, you
can use network interface connector.
z E1 120-ohm balanced twisted pair cable, network interface connector, 75-ohm-to-120-ohm adapter
are optional accessories, and you need to make a selection when purchasing an E1VI module;
otherwise, they are not provided.
3.2.6 Connecting Interface Cable
Caution:
z Some measures are taken to protect Router E1 Voice 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;
z 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 DB15 connector of the cable into the DB15 port on the Router E1
Voice Module module and fasten the screws;
Step 2: Connect the RJ45 connector of the cable to:
z The peer device directly, if the resistance of the port to be connected is 120-ohm,
and there is no need to extend the cable;