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214 CHAPTER 4: FLEXIBLE INTERFACE CARDS
The FIC-IMA-8E1 card provides eight E1 ports and uses a 120-ohm or 75-ohm 8E1
conversion cable. The two types of 8E1 conversion cables look similar. Both of
them have a DB-68 connector at one end for connecting the router. However, the
75-ohm 8E1 conversion cable contains 16 coaxial cables and the 120-ohm 8E1
conversion cable contains eight twisted pairs, as shown in the following figures:
Figure 261 75-ohm 8E1 conversion cable
Figure 262 120-ohm 8E1 conversion cable
Connecting the Interface
Cable
Step 1: Choose a 4E1/8E1 conversion cable appropriate to the interface type of
the peer device to be connected.
■ If the interface impedance of the peer device is 75 ohm, use a 75-ohm 4E1/8E1
conversion cable.
■ If the interface impedance of the peer device is 120 ohm, use a 120-ohm
4E1/8E1 conversion cable.
Step 2: Insert the DB-68 connector at one end of the 4E1/8E1 conversion cable to
the DB-68 port on the FIC-IMA-4E1/FIC-IMA-8E1 card, and fasten the cable
retaining screws.
Step 3: Identify the sequence numbers of the connectors at the other end of the
4E1/8E1 conversion cable and connect one connector (or a pair of connectors) to
the peer device.