3com MSR 20-20 사용자 설명서

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 4: F

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 I

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Step 1: Choose an 8E1 conversion cable appropriate to the interface type of the 
device to be connected.

■

If the interface impedance of the device is 75-ohm, use a 75-ohm 8E1 
conversion cable.

■

If the interface impedance of the device is 120-ohm, use a 120-ohm 8E1 
conversion cable.

Step 2: Insert the DB-68 connector of the cable to the DB-68 port on the 
FIC-8E1/FIC-8E1-F card, and fasten the cable fastening screws.

Step 3: Identify the sequence number of the other end of the 8E1/4E1 conversion 
cable and connect it with a peer device.

Step 4: Power on the router. Check the behavior of the LINK LED on the card 
panel: OFF means fault has occurred on the line and signal is out of 
synchronization. Check the line status.

FIC-1T1/FIC-2T1/FIC-4T1, the 1-/2-/4-port channelized T1/PRI interface card, 
transmits, receives, and processes T1 data traffic. In addition, you can use the card 
for other purposes, such as CT1 access and the ISDN PRI function.

FIC-1T1-F/FIC-2T1-F/FIC-4T1-F, the 1-/2-4-port fractional T1 interface card, differs 
from the FIC-1T1/FIC-2T1/FIC-4T1 primarily in the sense that:

■

The FT1 operating mode supported by the T1-F cards allows only one n 

× 64 

kbps or n 

× 56 kbps bundle to be formed on each interface, where n = 1 to 24. 

However, a T1 card allows arbitrary grouping of 24 channels and multiple 
bundles.

■

The FIC-T1-F cards do not support PRI mode.

The following table describes the interface attributes of the FIC-T1/FIC-T1-F cards.