Filter
Top Products
168 CHAPTER 4: FLEXIBLE INTERFACE CARDS
Connecting the Interface
Cable
c
CAUTION: Before you connect a port, read its label carefully; a wrong connection
can cause damages to the interface card and even the device.
If outdoor cabling is involved, consider to install a special lightning arrester at the
input end of the interface cable for better lightning protection.
Connecting the interface cable of the FIC-1E1/FIC-2E1/FIC-1E1-F/FIC-2E1-F
Step 1: Identify type of the E1 cable, and set the DIP switch for the
to-be-connected E1/FE1 port correctly.
Step 2: Plug the DB-15 connector of the E1 cable into the E1/FE1 port on the card.
Step 3: Connect the other end of the E1 cable to another device.
When using a 75-ohm unbalanced coaxial cable, do the following:
■ If no cable extension is needed, directly connect the BNC connector of the
cable to the device.
■ If cable extension is needed, connect the BNC connector of the cable to a
coaxial connector, and then connect the other end of the coaxial connector to
the device using a 75-ohm E1 trunk cable.
c
CAUTION: When connecting the router to another device using an E1 coaxial
cable, make connection with the TX end to the RX end and the RX end to the TX
end.
Figure 205 Extending an E1 75-ohm unbalanced coaxial cable
■ If the to-be-connected network device has a 120-ohm port, you need a
75-ohm-to-120-ohm adapter or a 120-ohm cable instead.
When using a 120-ohm balanced twisted-pair cable, do the following:
■ If no cable extension is needed, directly connect the RJ-45 connector of the
cable to the RJ-45 port on the device.
■ If cable extension is needed, connect the RJ-45 connector of the cable to a
network interface connector, and the other end of the network interface
connector to the device using a 120-ohm E1 trunk cable.
Router
Network
devices
such as DDN
DB-15
Coaxial connector
BNC
BNC
75-ohm non-balanced coaxial cable
75-ohm E1 trunk cable
Router
Network
devices
such as DDN
DB-15
Coaxial connector
BNC
BNC
75-ohm non-balanced coaxial cable
75-ohm E1 trunk cable