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1-32 About the PathBuilder S24x, 26x, and 27x switch
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
the Card
When you receive a DSPM/FXS card, do the following:.
-48V Ringer/Power
Supply Required
The DSPM/FXS card requires installation of a -48V ringer/power supply card and
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.
Step Action
1 Remove the card from the packing material.
2 Inventory the contents of the shipping container.
N
o
t
e
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.
3 Power off the PathBuilder S24x, 26x, and 27x switch node.
4 Install the card into the PathBuilder S24x, 26x, and 27x switch node.
5 Cable the card to the -48V ringer/power supply as required.