3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 3
Multifunctional Interface Modules (Router 5000)
3-39
Caution:
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 interface modules and even the
Router;
Some protection measures are taken for Router 2 and 4-Port CE1/PRI MIM and
modules. Still, you are recommended to install a special lightning arrester at the
input end of the cable leading to the outdoors in order to protect the line against
lightning strikes more efficiently.
Step 1: Check the type of cable, and set the DIP switches module correctly;
Step 2: Plug the DB-15 connector of the cable into the port on the module;
Step 3: Connect the other end of the cable to the network device;
1) When using 75-ohm unbalanced coaxial cable,
z Connect its BNC connector to the device to be connected directly, if cable
extension is not needed;
z Connect its BNC connector to a coaxial connector and the other end of the
coaxial connector to the device to be connected through a 75-ohm trunk cable, if
cable extension is needed;
Caution:
Connect the local Tx wire in the cable to the remote Rx wire and the local Rx wire to the remote Tx wire.
Router
Network
devices
such as DDN
DB-15
Coaxial connector
BNC BNC
75-ohm non-balanced coaxial cable
75-ohm E1 trunk cable
Figure 3-45 Extending an 75-ohm unbalanced coaxial cable