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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-63
4.20.5 Connecting the Interface Cable
Caution:
If outdoor cabling is involved, consider to install a special lightning arrester at the input
end of the interface cable for better lightning protection.
Before you connect a port, read its label carefully; a wrong connection can cause
damages to the interface card and even the device.
Step 1: Insert the DB-15 connector of the cable into the DB-15 port on the Router
1-Port E1 Voice FIC and tighten the thumbscrews.
Step 2: Connect the RJ-45 connector at the other end of the cable as follows:
z If the impedance of the to-be-connected port is 120-ohm, and if cable extension is
not required,
Directly plug the RJ-45 connector into the port.
z If the impedance of the to-be-connected port is 120-ohm, and if cable extension is
required,
Extend the E1 120-ohm balanced twisted-pair cable with a network connector, as
shown in the following figure.
Router
Voice
Device
DB-15
Network interface
RJ-45
RJ-45
120-
ohm balanced
120-
ohm E1
trunk cable
twisted pair cable
connector
Router
Voice
Device
DB-15
Network interface
RJ-45
RJ-45
120-
ohm balanced
120-
ohm E1
trunk cable
twisted pair cable
connector
Figure 4-62 Extend an E1 120-ohm balanced twisted-pair cable
z If the impedance of the to-be-connected port is 75-ohm,
Use a 75-to-120-ohm adapter for connection.
Step 3: Power on the router, and check the behavior of the LINK LED on the Router
1-Port E1 Voice FIC panel: OFF means fault occurs on the line. Check it for the cause.