3Com 3C13886 Installation Guide - Page 54

protection when the cable is led outdoors

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3Com Router Module Guide Chapter 3 Multifunctional Interface Modules 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 RJ-45 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; 3-10

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3Com Router Module Guide
Chapter 3
Multifunctional Interface Modules
3-10
Figure 3-14
75-ohm-to120-ohm adapter (with BNC connector)
Caution:
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, and you need to make a selection when purchasing an E1VI module;
otherwise, they are not provided.
3.2.6
Connecting Interface Cable
Caution:
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;
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 RJ-45 connector of the cable to:
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;