Avaya 8400B Plus User Manual

8400B Plus Data Module

User’s Guide

Comcode 107893323

555-020-709

Issue 2

November 1996

Notice

While reasonable efforts were made to ensure that the information in this document was complete and accurate at the time of printing, Avaya can assume no responsibility for any errors. Changes and corrections to the information contained in this document may be incorporated into future reissues.

Your Responsibility for Your Syst em’s Secu-

Toll fraud is the unauthorized use of your tele-

rity

communications system by an unauthorized party, for

example, persons other than your company’s employees, agents, subcontractors, or persons working on your company’s behalf. Note that there may be a risk of toll fraud associated with your telecommunications system, and if toll fraud occurs, it can result in substantial additional charges for your telecommunications services.

You and your System Manager are responsible for the security of your system, such as programming and configuring your equipment to prevent unauthorized use. The System Manager is also responsible for reading all installation, instruction, and system administration documents provided with this product in order to fully understand the features that can introduce risk of toll fraud and the steps that can be taken to reduce that risk. Avaya does not warrant that this product is immune from or will prevent unauthorized use of common-carrier telecommunication services or facilities accessed through or connected to it. Avaya will not be responsible for any charges that result from such unauthorized use.

Avaya Fraud Intervention If you suspect you are

being victimized by toll fraud and you need technical support or assistance, call Technical Service Center Toll Fraud Intervention Hotline at 1 800 643-2353.

Warranty Avaya provides a limited warranty on this

product. Refer to the “Limited Use Software License Agreement” card provided with your package.

CE Compliant The CE mark on this product indi-

cates technical compliance with the European Council EMC Directive 89/336/EEC.

Federal Communication s C ommission Statement: Part 15: Class A Statement

figuration of this equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his or her own expense.

The US Con-

Trademarks DEFINITY is a registered trademark of

Avaya. Hayes is a registered trademark of Hayes Microcomputer Products, Inc. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. Smartmodem is a trademark of Hayes Microcomputer Products, Inc.

Ordering Information

Call: US Voice:1 800 457 1235

US Fax:1 800 457 1764 non-US Voice:+1 410 568 3680 non-US Fax:+1 410 891 0207

Write: Globalware Solutions

200 Ward Hill Avenue Haverhill, MA 01835 USA

Order: Document No. 555-020-709

Comcode 107893323 Issue 2, November 1996

You can be placed on a Standing Order list for this and other documents you may need. Standing Order will enable you to automatically receive updated versions of individual documents or document sets, billed to account information that you provide.

Acknowledgment This document was prepared by

the Product Documentation Development group, Avaya Inc., Middletown, NJ.

About This Document vii

■ Purpose vii

■ Organization of This Guide vii

■ How to Order Documentation ix

■ How to Comment on This Document ix

■ Conventions Used x

■ Security Issues xi

■ Lucent Technologies Fraud Intervention xv

■ Related Documentation xv

Important Safety Instructions xvii

1 Introduction 1-1

■ Overview 1-1

■ Features 1-2

■ Physical Description 1-3

2 Installation 2-1

■ About the Terminal Device 2-1

■ Selecting the Correct Installation Procedure 2-2

Issue 2 November 1996 iii

Contents

■ Hardware Installation 2-8

■ Initial System Checks 2-11

■ Installation Options 2-12

■ Changing Installation Options 2-16

■ LED Indications 2-18

■ Selecting PC Communications Packages 2-21

3 Configuration and Operation 3-1

■ Operating Modes 3-1

■ Issuing Commands 3-2

■ Configuration Parameters 3-7

■ Data Operation 3-10

■ Voice Operations 3-18

4 Troubleshooting 4-1

■ How to Use This Chapter 4-1

iv Issue 2 November 1996

Contents

A AT Command Set A-1

B Dial Modifiers B-1

C S-Registers C-1

D Isolating Problems Using Loopback Data Tests D-1

■ Data Loopback Test D-1

■ Local Loopback Test D-3

■ Local Loopback Test with Self-Test D-4

■ Remote Loopback Test D-6

■ Remote Loopback Test with Self-Test D-8

■ Loop-Around Data Test Arrangement D-10

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Contents

E Quick-Reference Summaries E-1

GL Glossary GL-1

IN Index IN-1

vi Issue 2 November 1996

About This Document

Purpose

The purpose of this guide is to provide information for installing, operating, testing, and troubleshooting the 8400B Plus Data Module.

Organization of This Guide

The following paragraphs summarize the chapters and appendices contained in this guide.

■ Chapter 1, “Introduction,” discusses the basic operating features of the

8400B Plus Data Module and describes the external indicators and connectors.

■ Chapter 2, “Installation,” describes the hardware and software required

for installing the 8400B Plus Data Module, and outlines procedures for preparing the 8400B Plus Data Module for operation.

■ Chapter 3, “Configuration and Operation,” describes how to issue

commands to your 8400B Plus Data Module. In addition, it describes how to change, store, and recall configuration parameters, and outlines how to create and save custom configuration profiles. It also provides some basics on the operation of the 8400B Plus Data Module, outlines a typical on-line data session, and discusses more advanced command usage with example command lines. If you are not familiar with the AT

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About This Document

command interface and you are not using your 8400B Plus Data Module with a PC communications package, you will need to familiarize yourself with this chapter.

■ Chapter 4, “Troubleshooting,” describes procedures for troubleshooting

problems that may be encountered while configuring and operating the 8400B Plus Data Module.

■ Appendix A, “AT Command Set,” contains an explanation of each AT

command accepted by the 8400B Plus Data Module.

■ Appendix B, “Dial Modifiers,” contains an explanation of each Dial

Modifier accepted by the 8400B Plus Data Module.

■ Appendix C, “S-Registers,” contains an explanation of each S-register

used by the 8400B Plus Data Module.

■ Appendix D, “Isolating Problems Using Loopback Data Tests,” provides

information on how to perform loopback tests and how to isolate problems using the 8400B Plus Data Modul e.

■ Appendix E, “Quick-Reference Summaries,” contains quick-reference

summaries of AT commands, S-registers, result codes, factory-default configuration settings, EIA/TIA-574 pin-outs, and the ASCII character set.

A glossary and an index are provided at the rear of this guide.

viii Issue 2 November 1996

How to Order Documentation

This document’s order number is 555-020-709. To order this document:

Call: Lucent Technologies Publications Center

Voice 1 800 457-1235 Fax 1 800 457-1764 International Voice 317 361-5353 International Fax 317 361-5355

Write: Lucent Technologies Publications Center

P.O. Box 4100 Crawfordsville, IN 47933

For more information about Lucent Technologies documents, see Business Communications Systems Publications Catalog, 555-000-010.

How to Comment on This Document

To comment on this document, please return the comment card at the back of the document.

Issue 2 November 1996

About This Document

Conventions Used

Throughout this guide, command lines that are typed are shown in typewriter-style characters, and responses that the 8400B Plus Data Module returns are shown in italics. The following is an example.

AT H

ENTER

Note the following characteristics of the display representation:

■ The first line is a command line as it should be typed. The symbol,

ENTER

when shown, indicates that you must press the Enter or Return key to complete the command line.

■ Spaces are used to separate commands in some examples shown in this

guide. In actual use, the spaces may be typed, but they are not required.

■ The second line in the example shows a typical response returned by the

8400B Plus Data Module.

Throughout this document, toll fraud security hazards are indicated by an exclamation point inside a triangle and the words Security Alert.

Security Alert:

Security Alert indicates the presence of a toll fraud security hazard. Toll fraud is the unauthorized use of your telecommunications system by an unauthorized party (for example, persons other than your company’s employees, agents, subcontractors, or persons working on your company’s behalf). Be sure to read “Your Responsibility for Your System’s Security” on the inside front cover of this book and ‘‘Security Issues’’ on

page xi of this section.

x Issue 2 November 1996

Security Issues

As a Lucent Technologies customer, you should be aware that there is an increasing problem of telephone fraud. Telephone toll fraud can occur in many forms, despite the numerous efforts of telephone companies and telephone equipment manufacturers to control it. Some individuals use electronic devices to prevent or falsify records of these calls. Others charge calls to someone else’s number by illegally using lost or stolen calling cards, billing innocent parties, clipping onto someone else’s line, or breaking into someone else’s telephone equipment physically or electronically.

Today security problems are not just limited to toll fraud. There have been sharp increases in reported incidents of hackers: criminals skilled in reprogramming computer systems, accessing telecommunications systems through remote administration or maintenance ports. These ports cannot be used to place phone calls, but hackers can gain control over the setup of the system. Through these ports, hackers create security “holes” to allow unauthorized calling — a serious form of electronic vandalism.

Maintenance ports are their most recent target of abuse. In this scenario, hackers find a private branch exchange (PBX) maintenance port number with their “war dialer”; a device that randomly dials telephone numbers until a modem or dial tone is obtained. They then “hack” the user ID and password, sometimes just by using the PBX defau lt pas sw or ds , to enter your sys tem.

This is the most dangerous type of abuse because, once in your system, the hackers have control over all the administrative commands. While in your system, they have been known to:

■ Turn on Remote Access or Direct Inward System Access (DISA).

Hackers have been known to change the system at 8:00 p.m. to allow fraudulent calls. Then, at 3:00 a.m., they reprogram the system back to its original configuration. One company was hit three weekends in a row before it realized what was happening.

■ Turn off Call Detail Recording (CDR) or Station Message Detail

Recording (SMDR), hack your system all weekend, then turn it back on before Monday morning. This is especially disturbing to managers who

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About This Document

are security conscious and check the CDR/SMDR reports every morning looking for suspicious activity. They will not see records of the calls because CDR/SMDR was turned off by the hackers. The administrator may notice the absence of CDR/SMDR records for evening, night, and weekend calls made by employees.

NETCON Data Channels

The NETCON (Network Control) data channels provide internal access to the system management capabilities of your DEFINITY® Communications System. If the 8400B Plus Data Module is connected to a modem, or there is a modem pool, your system may be at risk for toll fraud.

Expert toll hackers will target the administration and maintenance capabilities of your system. Once criminals gain access to the administration port, they are able to change system features and parameters so that fraudulent calls can be made. In a modem pool or NETCON modem installation, this would also permit a hacker to transfer to a NETCON extension, get data tone, and obtain a login prompt — permitting transfer out to make toll calls.

If the data module or modem must be connected to a NETCON administration port, then deny access to any high-risk features or endpoints by placing them in restricti on grou ps on the D EFINITY Communi cations System. This rest ricts th eir accessibility from the incoming facility or endpoints that could transfer a call.

Also, use Class of Restriction to Class of Restriction (COR-to-COR) to restrict stations from calling the NETCON data channels, so that only CORs allowed to access the maintenance port are able to do so. For example, if voice mail extensions have a COR of 9, and extensions assigned to NETCON channels have a COR of 2, ensure that COR 9 does not have access to COR 2. Anyone not authorized to use the NETCON channel should not be able to access it.

In addition, a data module or modem port used for voice mail maintenance or administrative access is often a switch extension. It should be restricted in the same manner as the NETCON channel.

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Security Issues

PBX Security Measures

Everyone in your company who uses the telephone system is responsible for system security. Users and attendants need to be aware of how to recognize and react to potential hacker activity. Informed people are more likely to cooperate with security measures that often make the system less flexible and more difficult to use.

Implement the following general security measures to protect your PBX, and discourage the unauthorized use of your communications system.

■ Never program passwords or authorization codes onto auto-dial buttons.

Display phones reveal the programmed numbers, and internal abusers can use the auto-dial buttons to originate unauthorized calls.

■ Discourage the practice of writing down passwords. If a password needs

to be written down, keep it in a secure place and never discard it while it is active.

■ Attendants should tell their system manager if they answer a series of

calls where there is silence on the other end or the caller hangs up.

■ Users who are assigned voice mailboxes should frequently change

personal passwords and should not choose obvious passwords.

■ Advise users with special telephone privileges (such as Remote Access,

voice mail outcalling, and call forwarding off-switch) of the potential risks and responsibilities.

■ Be suspicious of any caller who claims to be with the telephone company

and wants to check an outside line. Ask for a callback number, hang up, and confirm the caller’s identity.

■ Never distribute the office telephone directory to anyone outside the

company; be careful when discarding it.

■ Never accept collect phone calls.

■ Never discuss your telephone system’s numbering plan with anyone

outside the company.

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xiii

About This Document

■ Change passwords frequently (at least quarterly). Set password

expiration times and tell users when the changes go into effect. Changing passwords routinely on a specific date (such as the first of the month) helps users to remember to do so.

■ Establish well-controlled procedures for resetting passwords.

■ Limit the number of invalid attempts to access a voice mail to five or less.

■ Monitor access to the dial-up mainte nan ce port. C han ge the acces s

password regularly and issue it only to authorized personnel. Consider using the Remote Port Security Device (RPSD) — a Lucent Technologies product that helps protect your administration and maintenance ports from unauthorized access.

■ Create a PBX system management policy concerning employee turnover

and include these actions:

— Delete all unused voice mailboxes in the voice mail system. — If an employee is terminated, immediately delete any voice

mailboxes belonging to that employee.

— If a terminated employee had Remote Access calling privileges

and a personal authorization code, remove the authorization code immediately.

— If barrier codes and/or authorization codes were shared by the

terminated employee, these should be changed immediately. Notify the remaining users as well.

— If the terminated employee had access to the system

administration interface, their login ID should be removed (G3V3 or later). Any associated passwords should be changed immediately.

■ Back up system files regularly to ensure a timely recovery should it be

required. Schedule regular, off-site backups.

■ Keep the attendant console and supporting documentation in an office

that is secured with a changeable combination lock. Provide the combination only to those individuals having a real need to enter the office.

xiv Issue 2 November 1996

Lucent Technologies Fraud Intervention

■ Keep telephone wiring closets and equipment rooms locked.

■ Keep telephone logs and printed reports in locations that only authorized

personnel can enter.

■ Design distributed reports so they do not reveal password or trunk

access code information.

Lucent Technologies Fraud Intervention

If you suspect you are being victimized by toll fraud and you need technical support or assistance, call Technical Service Center Toll Fraud Intervention Hotline at 1 800 643-2353.

Important Safety Instructions

When using your equipment, basic safety precautions, including the following, should always be followed to reduce the risk of fire, electric shock, and injury to persons:

■ Read and understand all instructions.

■ Follow all warnings and instructions marked on the product.

■ This product can be hazardous if immersed in water. To avoid the

possibility of electric shock, do not use when you are wet. If you accidentally drop it into water, do not retrieve it until you have first unplugged the power cord from the alternating current (AC) outlet, the line cord from the modular wall jack, and all interconnecting cords from the terminal equipment. Do not plug the cords back in until the product has dried thoroughly.

■ Avoid touching the product during electrical storms in your immediate

area. There is a remote risk of electric shock from lightning. Even though protective measures may have been installed to limit electrical surges from entering your business, absolute protection from lightning is impossible.

■ Never push objects of any kind through housing slots as they may touch

hazardous voltage points or short out parts that could result in a risk of electrical shock. Never spill liquid of any kind on the product.

■ Disconnect the cords on this product before cleaning. Do not use liquid

cleaners or aerosol cleaners. Use a damp cloth for cleaning.

■ Slots and openings in the housing and the back or bottom are provided

for ventilation to protect it from overheating; these openings must not be blocked or covered. The openings should never be blocked by placing the product on a rug or other similar surface. This product should never be placed near or over a radiator or heat register. This product should not be placed in a built-in installation unless proper ventilation is provided.

■ This product should be operated only from the type of power unit

indicated in this manual. If you are not sure of the type of power supply being used, contact a qualified service person.

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xvii

Important Safety Instructions

■ Do not allow anything to rest on the power cord. Do not locate this

product where the cord will be abused by persons walking on it.

■ Do not overload wall outlets and extension cords as this can result in the

risk of fire or electric shock.

■ Disconnect the cords on this product and refer servicing to qualified

service personnel under the following conditions:

a. When the power supply cord or plug is damaged or frayed. b. If liquid has been spilled into the product.

c. If the product has been exposed to rain or water.

d. If the product does not operate normally by following the operating

instructions.

e. If the product has been dropped or the housing has been

damaged.

f. If the product exhibits a distinct change in performance.

SAVE THESE INSTRUCTIONS

When you see this symbol on the product, refer to the instruction booklet packed with the product for more information before proceeding.

xviii Issue 2 November 1996

Introduction

This chapter discusses the basic operating features of the 8400B Plus Data Module and describes the external indicators and connectors.

The 8400B Plus Data Module is a new version of the 7400B Plus Data Module and has been designed explicitly to work with two-wire DEFINITY Digital Communications Protocol circuits. It is fully compatible with the 7400B Plus and supports all of its functionality and applications.

Overview

Congratulations on the addition of the Lucent Technologies 8400B Plus Data Module. Following our tradition of excellent quality and high reliability, we have designed this new 8400B Plus Data Module with the latest advances in telecommunications technology.

The 8400B Plus Data Module is a full-duplex asynchronous data module. It provides integrated voice-data communications at the desktop over standard twisted-pair wiring. At the desk, the 8400B Plus Data Module provides asynchronous communication speeds ranging from 300 bps to 19.2 Kbps. The 8400B Plus Data Module’s ability to emulate a Hayes® compatible modem interface makes it compatible with many standard PC communications packages that use Hayes command sets. In addition, the 8400B Plus Data Module provides a voice dial capability that allows you to initiate voice calls from

Issue 2 November 1996 1-1

Introduction

a personal computer (PC) using industry-standard ‘‘auto-dialer’’ PC communications pac k ages .

The 8400B Plus Data Module is a data service link between a Data Terminal Equipment (DTE) device, a two-wire telephone, and a Lucent Technologies DEFINITY

Communications System G3V2 or later.

NOTE:

Unless a specific DTE device is intended, the words terminal device shall be used throughout this guide to represent any applicable DTE device, including a dumb terminal, or a PC with an appropriate communications package.

Features

A terminal device is connected to the 8400B Plus Data Module using a standard Electronics Industries Association EIA-232-D Connector cord and, if needed, the supplied M9/F25 Adapter. The M9/F25 Adapter converts a 25-pin interface to a 9-pin interface, adhering to the Electronics Industries Association/ Telecommunications Industry Association EIA/TIA-574 standard. A Digital Communications Protocol (DCP) interface (using a type D8W modular telephone cord) is used to connect the 8400B Plus Data Module to the digital PBX.

The 8400B Plus Data Module may be optioned for use either with or without a telephone. In the stand-alone case, the 8400B Plus Data Module supports data service only. Otherwise, the 8400B Plus Data Module provides simultaneous data and voice service. The 8400B Plus Data Module works with all DCP voice terminals that support two-wire operation (such as the 8400 series voice terminals) to provide simultaneous data and voice service.

The voice dial feature allows you to dial a voice call without touching the telephone. Depending on your communications package, you may also store telephone numbers on a PC and recall them for dialing, log phone calls for easy billing, and take notes for later reference during a telephone conversation.

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Physical Description

In addition, the 8400B Plus Data Module can be used to automatically turn on the speakerphone of the voice terminal when a voice call is dialed from your terminal device.

Additional features of the 8400B Plus Data Module include the following:

■ nonvolatile, read-write memory for storing installation options, two data

options profiles, and up to four telephone numbers

■ an AT command interface that emulates a Hayes 2400 Smartmodem™

and supports the following:

— storage of the wait time for carrier detect interval (S-register S7) — voice call origination using the ATDP command

■ automatic speed and parity adjustment

■ even, odd, mark, space or no parity

■ automatic data throughput adjustment

■ power-up self-test

■ local and remote loopback tests with test duration timers

■ voice terminal powered by the PBX is not affected if AC power is

removed from the 8400B Plus Data Module

Physical Description

The 8400B Plus Data Module is housed in a black casing, approximately 5" x 7.75" x 1.5". Its name appears on the underside of the unit. The external features of the front and rear panels and the separate power supply units are described in this section.

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Introduction

Front Panel

The front panel of the 8400B Plus Data Module is shown in Figure 1-1. One red light emitting diode (LED) and one green LED on the front panel indicate the status of the set during normal operation, and the result of self-tests when initially powered.

Figure 1-1. Front Panel of the 8400B Plus Data Module

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Physical Description

Rear Panel

The rear panel of the 8400B Plus Data Module is shown in Figure 1-2, and the connectors located on the rear panel are described in Table 1-1.

LINE/

PHONE

Figure 1-2. Rear Panel of the 8400B Plus Data Module

USE ONLY WITH COMMUNICATION

POWER

CIRCUIT POWER SOURCE

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Introduction

Table 1-1. Rear Panel Connector Descriptions

Connector Description

PHONE This connector accepts one end of the D8W telephone line

cord used to connect a two-wire voice terminal to the 8400B Plus Data Module.

LINE/ POWER

EIA CONNECTOR INTERFACE

This connector accepts one end of the D8W telephone cord that connects between the 8400B Plus Data Module and either:

■ a PBX wall jack already powered by a closet

supply, or

■ a power supply, which is connected to the PBX

wall jack.

This unlabeled connector provides an interface between the 8400B Plus Data Module and the terminal device.

■ If the communications port on the terminal

device is a 9-pin interface, use a cord with DB9 male connectors on each end to connect the Data Module to the terminal device.

■ If the communications port on the terminal

device is a 25-pin interface, use a 25-pin EIA-232-D cord, plus the supplied M9/F25 Adapter to connect the Data Module to the terminal device.

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Physical Description

Power Supply Unit

A Lucent T echnologies power supply unit is shipped with each 8400B Plus Data Module. This unit connects to a grounded AC outlet, and provides a connection between the PBX wall jack and the 8400B Plus Data Module. The power supply unit provides the necessary operating voltages for the 8400B Plus Data Module.

CAUTION:

Use the 8400B Plus Data Module only with an approved communication circuit power source.

CAUTION:

Make certain that the AC outlet to which you connect the power supply is unswitched (for example, not controlled by a wall switch or light dimmer).

Instructions for installing the power supply unit are provided in ‘‘Hardware Installation’’ on page 2-8.

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1-7

Installation

This chapter describes the equipment required for installing the 8400B Plus Data Module, and outlines procedures for preparing it for operation. If you are using the 8400B Plus Data Module with a PC, you will be ready to use a PC communications package after reading this chapter. If you are using the 8400B Plus Data Module with a terminal, printer, or host, or you want to learn about the AT interface and operations, read this chapter, and then continue to Chapter 3.

About the Terminal Device

The 8400B Plus Data Module operates with any asynchronous data terminal device that has either an EIA-232-D or RS-232-C interface. If you are using a PC as your terminal, you will need a suitable PC communications package. EIA Connector cord and PC communications package requirements are described in this chapter.

Y ou must set the appropriate configuration options before connecting the 8400B Plus Data Module to a printer or plotter. To do this, connect a data terminal or PC to the EIA Connector Interface on the 8400B Plus Data Module, change and store the necessary configuration parameters, remove the data terminal or PC, and then connect the printer or plotter. The configuration parameters used for this type of operation are described in ‘‘Remote Site Use’’ on page 3-13.

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Installation

Selecting the Correct Installation Procedure

The 8400B Plus Data Module is available in two configurations. Before you can successfully install the data module, you must ascertain which configuration you have. Refer to Figure 2-1 (on page 2-3) for an illustration of the components included with each configuration.

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Selecting the Correct Installation Procedure

CONFIGURATIONS

United States International

400B2

Adapter

one 7-foot

D6AP 87 cord

KS-22911,L2 Power Supply

8400B Plus

Data Module

one 7-foot D8W

telephone cord

M9/F25 Adapter

DEFINITY

Adjunct Power Kit,

containing:

8400B Plus Data Module

two 7-foot D8W telephone cords

M9/F25 Adapter

MSP-1 Power Supply Kit, containing:

one power

cord

LINEPHONE

OTHER

-7 +8

-2

MSP-1

Power S upply

Figure 2-1. Components of the US Configuration and the International

Configuration

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2-3

Installation

What You Need

To install and operate the 8400B Plus Data Module, you will need the following items:

■ an asynchronous data terminal or PC with a terminal emulation program

and EIA cord

■ (optional) a two-wire DCP voice terminal with D8W cord

Figure 2-2 illustrates a standard US Configuration, using a telephone and separate power supply.

Figure 2-3 illustrates a standard International Configuration, using a telephone and separate power supply.

The US Configuration may be installed using the Lucent Technologies 1145A or Lucent Technologies 1145B1 closet power supply. The International Configuration may be installed using the Lucent Technologies 1145B1 closet power supply. Both configurations are shown in Figure 2-4. This type of installation eliminates the need for the separate power supply.

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