3Com MSR 50, MSR 30, MSR 20 manual Following figure illustrates the FIC-24FXS panel

224CHAPTER 4: FLEXIBLE INTERFACE CARDS

Step 2: Connect the cable.

1To 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.

2To 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.

FIC-24FXS

Introduction 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.

Interface Attributes

Table 167 Interface attributes of the FIC-24FXS card

Attribute	Description
Connector	50-pin D-type female connector
Interface standard	FXS interface
Interface rate	24 ⋅ FXS interface rate

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

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

LED	Description
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

The following figure illustrates the FIC-24FXS panel.

Figure 276 FIC-24FXS front panel