3Com S26x, S27x, S24x installation manual 48V Ringer/Power Supply Card and Enclosure, Introduction

Hardware Components

-48V Ringer/Power Supply Card and Enclosure

Introduction	One -48V ringer/power supply card and enclosure is required per PathBuilder S24x,
	26x, and 27x switch node for
	• Analog DSPM/FXS cards
	• DSPM/E&M cards using interface signaling types II, III, and V.
	DSPM/E&M card with an interface signaling of type I does not require a -48V
	ringer/power supply card and enclosure.
Description
	The -48V ringer/power supply card comes in an enclosure, which you must install in
	the PathBuilder S24x, 26x, and 27x switch if you are field upgrading to support the
	Voice option.
	New PathBuilder S24x, 26x, and 27x switch nodes ordered with the voice option
	ship with the -48V ringer/power supply factory installed.
	The -48V ringer/power supply card supports the following:
	• 12 E&M ports, or 6 DSPM/E&M cards
	• 4 FXS ports, or 2 DSPM/FXS cards
Function
	The -48V ringer/power supply card rings up to four phones at a time.

-48V Ring/Power There are two versions of the -48V ringer/power supply: Standard and Enhanced.

Supply Types• The Standard -48V ringer/power supply (see Figure 1-22)can support two FXS cards.

•The Enhanced -48V ringer/power supply (see Figure 1-23)can support six FXS cards. (Available in the Fall of 1998.)

Jumper Definitions The -48V ringer/power supply card has two sets of jumpers for various requirements.

•One set of jumpers to enable or disable the -48V ringer supply output (should not be changed from its default setting of enabled.)

•One set of jumpers to control the frequency of the ring supplied to the DSPM/ FXS card: 25 Hz (US) or 50 Hz (Europe).

For more information see Figure 1-22and Figure 1-23.

Jumper Locations The jumpers for 25 or 50 Hz ring frequency are located on the -48V ringer/power supply card as shown in Figure 1-22and Figure 1-23.

Installing Jumpers Figure 1-22and Figure 1-23show jumper positions on the -48V ringer/power supply card for 25 or 50 Hz ring frequency and how to install the jumpers for 25 or 50 Hz ring frequency.

1-38 About the PathBuilder S24x, 26x, and 27x switch