3com MSR 20 Manual Do Utilizador

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Step 2: Connect the cable.

1 To connect the module to an ISDN network, identify the type of the ISDN line 

provided by your telecommunications service provider.

■

If it is an ISDN U interface line, use an NT1 for conversion. Insert one end of the 
S/T interface cable into the S/T interface on the NT1 and the other end to a BSV 
interface on the FIC-2BSV/FIC-4BSV.

■

If it is an ISDN S/T interface line, directly connect the cable to a BSV interface on 
the FIC-2BSV/FIC-4BSV.

2 To connect the module to a TE device, use a crossover S/T interface cable. Connect 

the RJ-45 plug at one end of the cable to the FIC-2BSV/FIC-4BSV interface, the 
RJ-45 receptacle to a straight-through S/T interface cable, and then the 
straight-through cable to the TE device.

The 24-port voice subscriber circuit interface card (FIC-24FXS) processes and 
transmits voice signals over data communications networks for 24 regular analog 
phones, faxes, or AT0 loop trunks of telephone exchanges. It occupies two FIC 
slots.

FIC-24FXS has two kinds of LEDs, Active and Link.

The following figure illustrates the FIC-24FXS panel.

Figure 276   FIC-24FXS front panel

Table 167   Interface attributes of the FIC-24FXS card

Connector 

50-pin D-type female connector 

Interface standard 

FXS interface 

Interface rate 

24 

× FXS interface rate

Table 168   Description of LEDs on the FIC-24FXS panel

Active 

OFF means all links are idle. Blinking means 
one or more links are occupied. 

Link 

Steady ON means no fault occurs on the 
link