3Com MSR 20, MSR 30 Following figure illustrates the DFIC-24FXO24FXS panel, FXO interface

226CHAPTER 4: FLEXIBLE INTERFACE CARDS

DFIC-24FXO24FXS

Introduction The DFIC-24FXO24FXS provides 24-port voice subscriber circuit and 24-port voice AT0 analog trunk circuit. FXS interfaces process and transmit voice signals over data communications networks for 24 regular analog phones, faxes, or AT0 loop trunks of telephone exchanges. The FXO interfaces process and transmit voice signals over data communications networks for 24 loops of telephone exchanges.

Interface Attributes

Table 169 Interface attributes of the DFIC-24FXO24FXS module

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

Interface LEDs DFIC-24FXO24FXS has two kinds of LEDs, Active and Link.

Table 170 Description of LEDs on the DFIC-24FXO24FXS panel

LED FXO interface FXS interface

Active	OFF means all links are idle.
	Blinking means one or more
	links are occupied.
Link	Steady ON if an electric device
	is connected.

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

Steady ON means no fault occurs on the link

The following figure illustrates the DFIC-24FXO24FXS panel.

Figure 278 DFIC-24FXO24FXS front panel

Interface Cable DFIC-24FXO24FXS uses a 5 m (16.4 ft.) or 15 m (49.2 ft.) telephone conversion cable. At one end of the cable is a D50 male connector that is used to connect to the DFIC-24FXO24FXS card; at the other end are 24 RJ11 connectors.