3Com S26x, S27x, S24x installation manual Dspm Card with FXS Analog Interface, Introduction

Hardware Components

DSPM Card with FXS Analog Interface

Introduction	The Analog DSPM/FXS (Foreign Exchange Station) card supports two analog FXS
	interfaces.
Description
	The analog DSPM/FXS card allows the PathBuilder S24x, 26x, and 27x switch to
	support up to two voice/fax channels per card. Each DSPM/FXS card occupies one
	ISA slot in the PathBuilder S24x, 26x, and 27x switch.
Function
	The FXS interface provides a ringing voltage which alerts a station of an incoming
	call’s -48V to power the phone/fax, and its -48V loop current detector to detect when
	the station goes off hook. As a result, an analog DSPM card with an FXS interface
	allows a telephone set, fax machine, or telephone key set to attach to one of its two
	connectors.
When You Receive
	When you receive a DSPM/FXS card, do the following:.
the Card
	Step	Action

1Remove the card from the packing material.

2Inventory the contents of the shipping container.

Note

No cables are shipped with the DSPM/FXS card. The appropriate

6-position power cable and status cable ship with the -48V ringer/power supply card that must be used in conjunction with the DSPM/FXS card.

3Power off the PathBuilder S24x, 26x, and 27x switch node.

4Install the card into the PathBuilder S24x, 26x, and 27x switch node.

5Cable the card to the -48V ringer/power supply as required.

-48V Ringer/Power The DSPM/FXS card requires installation of a -48V ringer/power supply card and

Supply Required enclosure into the PathBuilder S24x, 26x, and 27x switch node. Refer to the “-48V Ringer/Power Supply Card and Enclosure” section on page 1-38.

Cables Required The DSPM/FXS interface card requires a -48V ringer/power supply cable, which can attach up to two DSPM/FXS cards to the power supply. The cable ships with

the -48V ringer/power supply card and enclosure.

For details concerning how to install and cable the DSPM card to the -48V ringer/ power supply card and enclosure, refer to the “-48V Ringer/Power Supply Card and Enclosure” section on page 1-38.

1-32 About the PathBuilder S24x, 26x, and 27x switch