AT&T SINGLE LINE BUSINESS TELEPHONES DESK User Manual

11/16/92

AT&T

AT&T Door Phone Controller

Installation and Operation Manual

Printed in U.S.A.

CIC# 999-500-315

0II722050-055

Issue 3, November 1992

NOTICE

Every effort was made to ensure that the information in this manual was complete and accurate at the time of printing. However, information is subject to change.

COMPATIBILITY

The AT&T Door Phone Controller is recommended for use with any AT&T business telephone system. It is also intended to be used with the AT&T Door Phone Speaker.

WARRANTY INFORMATION

AT&T provides a limited warranty to this product. Refer to “Warranty Information” in Appendix F.

Partner, Spirit, Merlin, System, Dimension, Horizon, Touch-Tone and Comkey are registered trademarks of AT&T.

AT&T Door Phone Controller Compatibility Chart

Mode

System

DIP

Switches

Home Use

(single line

service)

PARTNER

PLUS Spirit

308/616,

1224/2448

Dedicated

Trunk

Loop Start

(Section 4)

YES

see Note 11

YES

see Note 11

YES

see Note 4

Dedicated

Trunk

Ground

Start (Analog) (Analog)

(Section 4)

NO NO

NO YES

Port Saver Loop

Start

(Section 6)

see Notes 8,7 see Note 4

see Notes11,12

YES

see Notes 11,12

see Notes 4,6

Trunk Saver Loop Start

(Section 3/6)

YES

see Notes 11,12

YES

see Notes 11,12

YES

see Notes 4,6

Station

Access

Aux. Alert

(Section 5)

YES

Station

Access Auto

Ringdown

(Section 5)

YES

see Note 13

Merlin

206/410/820

Merlin II

Merlin

Plus

Merlin

1030/3070 System 25

System 75

see Note 14

System 85

see Note 14

Dimension

see Note 14

Horizon

see Note 14

YES

See Notes 4,5 see Notes 4,5

YES

see Notes 4,5

YES

see Notes 4,5

YES

see Notes 4,5

YES

see Notes 1,4

YES

see Note 4

NO YES

YES

see Notes 1,4

NO NO NO NO

YES

see Note 4

YES

see Note 4

YES

see Note 4

YES

see Notes 4,5,9

see Notes 4,5

YES

see Notes 4,5,9

YES

see Notes 2,7

NO NO

YES

see Notes 4,6,7

YES NO

see Notes 4,5

YES

see Notes 4,5,9

YES

see Notes 4,5

YES

see Notes 4,5,9

YES

see Notes 2,7 see Note 1

YES

see Notes 4,6,7

YES

see Not e 1

YES

Comkey

see Note 14 see Note 4

YES

see Note 4

YES

see Note 4

Application Notes (for Compatibility Chart)

When used in any mode of a System 25, if the user initiates a call to the door and he wishes to enter the Option Selection mode, pressing three pound keys followed by the digit 3 (i.e., # # # 3, not # # 3) must be entered. Actually, the first # does not seem to be recognized at any time during the call. However, it should be

noted that only # # 3 is needed to enter the Option Selection mode when the call is initiated from the door

button press. When sharing a trunk port on a System 25, that port

2. must be configured as an “805” PBX/Centrex, not an “801” Loop trunk. This is the only way to transmit a hook flash to that port.

On the Merlin 1030/3070 tip and ring station application,

there is a preset delay such that the Merlin system will disregard DTMF for the first 12 seconds of the connection. In this mode, users have the choice of either

changing that time period or waiting for it to time out for each call.

In general, the ring-cadence option selection applies

only if there is an auxiliary alert device connected. All of the EKTS/PBX’s will “absorb” the ringing signal from the AT&T Door Phone Controller and generate their own ring cadence to the telephone sets.

When using the AT&T Door Phone Controller in any con-

figuration with a Merlin System, the pound key must be

pressed twice (##) for each pound (#) sent to the unit when dialing from a multi-button set.

Port Saver/Trunk Saver operation will not work for

6. Tip/Ring sets. A switch-hook flash is not passed to the trunk port from these sets.

A trunk shared with the AT&T Door Phone Controller

should not be placed in a trunk pool with other trunks.

When the AT&T Door Phone Controller shares a C.O.

8. trunk, Trunk Saver operation is recommended.

Application Notes (for Compatibility Chart) continued

Tip/Ring telephone sets connected to the Merlin System

9. through a BTMI cannot use Port Saver/ Trunk Saver op-

eration. The BTMI wiII not transmit the required hook-flash signal.

10.

System 75 requires a pound (#) to be dialed at the end

of every dial string. This is required to send the dialed

number to the trunk port.

Tip/Ring telephone sets cannot be used in this mode to

11. access the AT&T Door Phone.

For PARTNER telephone sets not equipped with a Re-

12. call button, “FEATURE 03” must be dialed to send a

hook-flash signal to the trunk port.

13.

In the Ringdown mode, no number should be programmed in the AT&T Door Phone for it to dial when the door button is pressed. The PARTNER Plus system should be programmed to alert the desired stations when the door phone goes off-hook on its station port.

14.

The information for this system is based on engineering

judgment.

Contents

Introduction

■ Using This

■ Features

■ Terms You

Manual

Should Know

Installation Procedures

Important Safety Information

■

General Information

■

Introduction

■

Door Phone Controller Back Panel Connections

■

Prior to Installation

■

AT&T Door Phone Controller Location

■

Installation

■

Connecting Door Speaker, Door Switch to the AT&T Door Phone

■

Connecting Power

■

Operation and Controls Information

■

Connecting the AT&T Door Phone Controller to Your Telephone Equipment

Button, and

Controller

Door Ajar

1-1 1-2

1-3 1-5

2-1 2-3

2-5 2-6 2-6 2-8 2-9 2-11

2-13 2-17 2-20

2-22

Installation for Home/Residential

■ Overview

■ DIP Switch Selections

■ Installation

■ Option Selection

■ Operation – Basic Door Answer Function

3-1

3-2 3-2 3-3 3-5 3-7

vii

Installation for Telephone Systems With Available 4-1

Dedicated Trunk Port

■ Overview

■ DIP Switch Selections

■ Installation

■ Option Selection

■ Operation –

Basic Door Answer Function

4-2 4-2

4-3 4-6 4-8

5 Installation for Telephone Systems With Available 5-1

Station Port

■ Overview

■ DIP Switch Selections

■ Installation

■ Option Selection

■ Operation

5-2 5-2 5-3 5-5 5-8

6 Installation for Telephone Systems Without Available 6-1

Dedicated Trunk or

■ Overview

■ DIP Switch Selections

■ Installation

■ Option Selection

■ Port Saver or Trunk Saver Mode Installation

■ Operation – Basic Door Answer Function

Troubleshooting and Maintenance

■ Troubleshooting Procedures

■ Maintenance

Station Port

6-2 6-2

6-3 6-5 6-6 6-9

7-1 7-2

7-4

viii

DIP Switch Settings

A-1

Option Selection Mode Definitions

Specifications

Using the AT&T Door Phone Controller With an Answering Machine

AT&T Auxiliary Alert Option

B-1

C-1

D-1

E-1

F FCC Regulations and Warranty

F-1

Figures

Introduction 1-1.

Installation Procedures

2-1. 2-2. 2-3.

2-4.

2-5.

2-6.

2-7. 2-8.

2-9.

Front View of the AT&T Door Phone Controller and Control Panel

Door Phone Controller Back Panel Connections Typical AT&T Door Phone Controller Installation Mounting AT&T Door Phone Controller to Wall Connections for AT&T Door Phone Speaker, Door Button and Door Ajar Devices Connections for Remote Door Open Switch (optional) Connections for Electric Door Strike Plate (optional)

Connections for Auxiliary Alert Device (optional) Plug the AT&T Door Phone Controller Power Cord and Transformer to 120 VAC Outlet Configuration of Telephone Equipment Flow Chart

1-1 1-4

2-1

2-8 2-10 2-12 2-14

2-15

2-16

2-18 2-19

2-22

Installation-Home/Residential

3-1. 3-2. Connecting AT&T Door Phone Controller to

Home/Residential DIP Switch Settings

Standard Telephone Equipment

3-1 3-3

3-4

Installation-Dedicated Trunk Port

4-1

4-1. DIP Switch Setting for PBX with Dedicated Trunk 4-3

Port

4-2a.

Connecting Door Phone Controller to Standard 4-4 Telephone Equipment

4-2b.

Using Modified Modular Cable for Ground Start

4-5

Installations

Installation-Dedicated Station Port

5-1.

DIP Switch Configuration for Telephone System 5-3 with Dedicated Station Access, Station Mode

5-2. Connecting the AT&T Door Phone Controller to a 5-4

Telephone System with Dedicated Analog Station Port

Installation-No Dedicated Trunk/Station Port

6-1.

DIP Switch Setting for PBX With Shared Trunk Port 6-3

6-2. Connecting The AT&T Door Phone Controller to 6-4

a Telephone System With Shared Trunk Port

D Using the Door Phone Controller With An Answering

Machine

5-1

6-1

D-1

D-1.

Installation Method Used For Answering Only

D-2

Telephone Calls

D-2. Installation Method Used For Answering Both Door D-2

and Telephone Calls

Appendix-Auxiliary Alert Device Connections

E-1.

Connections For Auxiliary Alert Device

E-1

E-3

Tables

Installation-Home/Residential

3-1.

Installation-Dedicated Trunk Port

4-1. AT&T Door Phone Controller Option Selection

Installation-Dedicated Station Port 5-1 5-1.

AT&T Door Phone Controller Option Selection

Information

AT&T Door Phone Controller Option Selection

Information

3-1

3-6

4-1

4-8

5-7

xii

Installation-No Dedicated Trunk/Station Port 6-1.

Troubleshooting and Maintenance 7-1.

AT&T Door Phone Controller Option Selection

Information

Troubleshooting Procedures 7-2

6-1

6-8

7-1

Introduction

1-1

Using This Manual

This manual will help you install, program and operate the AT&T Door Phone Controller. It contains important information on what features are available and how to use them. We urge you to read this manual prior to installing the AT&T Door

Phone Controller; this will ensure that you are using the

product to its fullest capability. Section 1 (this section) provides basic information on what the

AT&T Door Phone Controller is and what are its features. Also

included is a GIossary of Terms, a necessity for persons not

familiar with telephone equipment operation and installation. Section 2, Installation, provides important installation

information. This section has step-by-step procedures for connecting the AT&T Door Phone Controller to such optional equipment as

■

Remote door unlocking devices

■

Door ajar switch

■

Auxiliary alert device

■

Remote open button

Section 2 also provides an easy to use flow chart, which directs the installer to the next appropriate section, depending on what type of telephone equipment (residential, PBX, etc.) will be used along with your AT&T Door Phone Controller.

Sections 3 through 6 – after reading Section 2 and the flow chart at the end of that section, the installer is referred to one of these sections. Depending on which section is referenced, all the necessary programming, switch setting and operating information will also be included.

Section 7 provides troubleshooting tips for when installation is complete and the AT&T Door Phone Controller is not operating correctly.

1-2 Introduction

Tear-out Reference Card at the end of this manual provides all the necessary option selection information along with complete DIP switch settings and their definitions.

The AT&T Door Phone Controller

The AT&T Door Phone Controller provides multi-functional control for communications to a dedicated door-speaker unit and a remote door-unlocking device. The AT&T Door Phone Controller (see Figure 1-1) can be used alone, or it can be used along with a PBX (Private Branch Exchange) or communications system to alert personnel within a residence or building that someone is requesting attention at the entrance. Operating the unit is simple: when the push button on the door speaker is pressed, the AT&T Door Phone Controller unit signals a telephone station(s) and can activate an auxiliary alerting device (such as a door bell, chime, or tone generator) within the home or building. Upon hearing the ringing telephone and/or alerting device, answer the phone and have a two-way phone conversation with the person at the door. The person inside the building can also remotely unlock the door, either by entering a numeric code (Door Code) on the telephone’s

touch-tone keypad, or by pressing a button.

Features

■ Control for remote door unlocking

■ Voice communications with door speaker

■ Door ajar detect

■ Interface for door bell, chime, or tone generator

■ Selectable option functions (from touch tone telephone)

Introduction 1-3

SPEAKER VOLUME

TALK BACK VOLUME

DIP SWITCH

LED

Figure 1-1. Front View of the AT&T Door Phone

Controller and Control Panel

1-4 Introduction

Terms You Should Know

AuxiliaryAlert

bell/chime within the building. Cadence —Telephone Ringing cycle, i.e., 2 second ringing,

4 second no ringing.

C.O. line —Central Office telephone line carrier into building. EKTS (Electronic Key Telephone System) —Small business

telephone communications system.

Ground Start —One method by which a business telephone system (PBX) signals the telephone company that you have gone off-hook. Used in most business applications – contact your telephone company to determine if you have Ground or

Loop Start.

Loop Start —One method of signaling the telephone company that your telephone has gone off-hook – used for most

residential and communication system applications. Contact your telephone company to determine if you have Ground or

Loop Start.

—A door speaker’s push button can activate a

PBX (Private Branch Exchange) —Business telephone system.

Ringdown

speaker’s push button will cause the AT&T Door Phone

Controller to dial the number of a predetermined telephone

station number (PBX or EKTS must be installed). When the telephone is answered, there is direct two-way communication with the door speaker.

Trunk Port —PBX connection for Central Office or trunk lines.

Station Port —PBX connection for station sets.

Hook-Flash —This causes telephone equipment to go “on

hook” for a duration usually less than a second (not long

enough to be considered as calling for the circuit to be

released.)

—In Station mode, the activation of the door

Introduction 1-5

Installation Procedures

Installation Procedures 2-1

2-2 Installation Procedures

Important Safety Instructions

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

Read and understand all instructions.

Follow all warnings and instructions marked on the

product.

Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.

Do not use this product near water, for example, near a bath tub, wash bowl, kitchen sink, or laundry tub, in a wet basement, or near a swimming pool.

Do not place this product on an unstable cart, stand, or

table. The product may fall, causing serious damage to the product.

Slots and openings in the cabinet and the back or bottom are provided for ventilation. To avoid overheating, these openings must not be blocked or covered. The openings should never be blocked by placing the product on the bed, sofa, 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

7. power source indicated on the marking label. If you are

not sure of the type of power supply to your home, con-

sult your dealer or local power company.

Installation Procedures 2-3

9. Do not allow anything to rest on the power cord. Do not

10. Do not overload wall outlets and extension cords as this

WARNING: RISK OF ELECTRICAL SHOCK –

EQUIPMENT MUST BE PROPERLY GROUNDED.

Your AT&T equipment requires a properly grounded three-prong power receptacle for safe operation. Have the receptacle checked by a qualified electrician before connecting this equipment. Do not cut or remove the

third (ground) prong from the power transformer. Do

not use two-prong extension cords or adapters to defeat the safety features of this equipment. If you have a two-prong receptacle, it must be replaced with

a three-prong receptacle, installed by a qualified

electrician.

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

can result in the risk of fire or electric shock.

11.

12. To reduce the risk of electric shock, do not disassemble

13. Unplug this product from the wall outlet and refer servic-

Never push objects of any kind into this product through cabinet slots as they may touch dangerous voltage points or short out parts that could result in a risk of fire or electric shock. Never spill liquid of any kind on the product.

this product, but take it to a qualified serviceman when some service or repair work is required. Opening or

removing covers may expose you to dangerous voltages or other risks. Incorrect reassembly can cause electric shock when the appliance is subsequently used.

ing to qualified service personnel under the following conditions:

A. When the power supply cord or plug is damaged or

frayed.

2-4 Installation Procedures

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. Adjust only those controls that are covered by the operating instructions, because

improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to normal operation.

E. If the product has been dropped or the cabinet has

been damaged.

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

14.

15.

SAVE THESE INSTRUCTIONS.

General Information

Please adhere to the following precautions:

1. Never install telephone wiring during a lightning storm.

2. Never install telephone jacks in wet locations unless the

3. Never touch uninsulated telephone wires or terminals un-

Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote risk of electric shock from lightning.

Do not use the telephone to report a gas leak in the

vicinity of the leak.

jack is specifically designed for wet locations.

less the telephone line has been disconnected at the network interface.

4. Use caution when installing or modifying telephone lines.

Installation Procedures 2-5

Introduction

Contact a licensed electrician for installation of optional devices such as an electric

strike plate and auxiliary alert

device which may require electrical wiring. For the electric

strikeplate, a low voltage device

(24 volts or less) is recommended.

This section provides instructions for installing your AT&T Door

Phone Controller. Provided are installation instructions for an optional electric door strike plate, door ajar contacts, and an auxiliary alert device. These optional components must be installed prior to the installation of your AT&T Door Phone Controller. (Refer to the respective installation manuals for specific mounting and wiring instructions.) The flow-chart provided in Figure 2-9, will help direct you to the next appropriate section for attaching the AT&T Door Phone Controller to the telephone equipment in your home or business (also see Compatibility Chart on page iii).

Inside the AT&T Door Phone Controller shipping carton

you will find:

■ The AT&T Door Phone Controller unit

■ Mounting template (along the edge of the Tear-out

Reference Card)

■ Power cord and attached transformer

■ Two mounting screws

■ Two 6-conductor modular-to-modular 6 foot long cables

■ Terminal strip connector

■ Instruction Manual (this manual)

Door Phone Controller Back Panel Connections

The 14-contact terminal strip

can be unplugged from the back

panel.

The AT&T Door Phone Controller back panel (see Figure 2-1) has two RJ11 modular connectors and one 14-contact “hard wire” terminal strip. These connections provide:

■ Auxiliary Alert Contacts (2) – output to optional door

bell/chime device.

■ Door Latch Contacts (3) – output to an electric door strike.

2-6 Installation Procedures

■ Remote Open Button Contacts (2) – input from a remote

(inside) door open button.

■ Door Ajar Switch Contacts (2) – input from door ajar device.

■ Door Bell Button Contacts (2) – input from door bell/chime

button.

■ Shield Contact (1) – used for shielding audio speaker wires.

■ Speaker Contacts (2) – provides audio connection to door

speaker(s).

Host system RJ11 (J1 Host) modular jack interface —This

jack is provided for connection to your own telephone set, or

business telephone system (PBX or EKTS) (the host system).

Central Office RJ11 (J2) modular jack interface —This jack is provided for connection to a C.O. telephone line (from telephone company’s central office).

WARNING: RISK OF ELECTRICAL SHOCK —

EQUIPMENT MUST BE PROPERLY GROUNDED.

not use two-prong extension cords or adapters to defeat the safety features of this equipment. If you

have a two-prong receptacle, it must be replaced with a three-prong receptacle, installed by a qualified

electrician.

Installation Procedures 2-7

AT&T DOOR PHONE CONTROLLER BACK PANEL

RJ11

CONNECTORS

14-POSITION

TERMINAL STRIP

(REMOVABLE)

Figure 2-1. Door Phone Controller Back Panel Connections

Prior To Installation

NOTE: Consider

Never install

jack is specifically designed for wet

Never touch uninsulated telephone wires or terminals unless the telephone network interface.

the following items before installation:

telephone wiring during a lightning storm. telephone jacks in wet

line has been disconnected at the

locations unless the

locations.

2-8 Installation Procedures

Use caution when

installing or modifying

telephone lines.

AT&T Door Phone Controller Location

You need to determine exactly where you want the unit installed and how you want it configured. Another consideration is what components will be used with the AT&T Door Phone Controller. Here are some questions that must be answered prior to installation:

■ Do you currently have a door speaker installed?

■ Do you have a business telephone system (PBX or EKTS)?

■ Do you have a remote door unlock mechanism (electric

door strike) installed?

■ Do you have an auxiliary alert system (door chime) currently

installed?

■ Do you have a door ajar switch installed?

The AT&T Door Phone Controller is designed to control the functions of the components mentioned above, and how you answer these questions will determine how the AT&T Door

Phone Controller will be installed, optioned, and operated.

When selecting options for your AT&T Door Phone Controller,

e.g., to change the door-unlock security code, the AT&T Door

Phone Controller unit must be DIP switch selected to Option

Selection mode. For this reason you may want to install the AT&T Door Phone Controller unit in a secure area which has access only by authorized personnel. If you are installing the

unit in a business environment (currently have PBX/EKTS), you

may wish to install the unit along with the telephone equipment.

(See Figure 2-2 for a typical installation diagram.)

Installation Procedures 2-9

AT&T DOOR PHONE CONTROLLER (Secure Location)

22-24 GAUGE WIRE

AUX. ALERT DEVICE

TELEPHONE

EXTENSION

22-24 GAUGE WIRE

DOOR AJAR

SWITCH

MODULAR PHONE

CABLE

TELEPHONE EQUIP.

22-24 GAUGE WIRE

EXISTING PHONE LINES

SHIELDED TWISTED PAIR SPEAKER WIRES

ATTENDENT

POSITION

DOOR SPEAKER

W/ PUSH BUTTON

ELECTRIC DOOR STRIKE PLATE DEVICE

Figure 2-2. Typical AT&T Door Phone Controller Installation

2-10 Installation Procedures

Installation

Mounting Instructions

The AT&T Door Phone Controller can be placed on a flat table or shelf, or mounted to a wall.

Wall Mount Instructions

The AT&T Door Phone Controller is shipped with a keyhole

mounting template and mounting screws. Follow the steps

below to mount the Door Phone Controller to a wall.

When moving AT&T Door Phone Controller or adding/ removing cables from back

panel, unplug transformer from

120V outlet.

Also unplug the terminal strip and modular phone connectors on the back panel.

Place template (tear-out page at end of manual) over

desired wall mounting location and mark screw positions.

2. Use a Philips screwdriver to screw each of the two screws into the marked screw positions.

IMPORTANT: Do not drive screws all the way into

wall; adequate space (5/16'') must be left to position the AT&T Door Phone Controller bottom panel

keyholes over screw heads.

3. Mount the AT&T Door Phone Controller over the protruding screw heads and seat unit firmly to the wall. See Figure 2-3.

WARNING: RISK OF ELECTRICAL SHOCK —

EQUIPMENT MUST BE PROPERLY GROUNDED.

not use two-prong extension cords or adapters to defeat the safety features of this equipment. If you have a two-prong receptacle, it must be replaced with a three-prong receptacle, installed by a qualified electrician.

Installation Procedures 2-11

4. When the AT&T Door Phone Controller is securely mounted to the wall, then all cables and wires can be

connected to the terminal strip and then plugged into

the back panel.

DOOR PHONE CONTROLLER BACK PANEL

KEYHOLE MOUNTING SLOTS

5/16'' TYPICAL

8.1''

MOUNTING SCREWS

Figure 2-3. Mounting AT&T Door Phone Controller to

Wall

2-12 Installation Procedures

Connecting Door Speaker, Door Button, and Door

Ajar Switch to the AT&T Door Phone Controller

Use the diagram in Figure 2-4 and follow the steps below:

Polarity of wires is not important.

Total wire length should not

exceed 1500 feet.

Door Ajar switch should be closed when door is closed. If a door ajar switch will not be used, you must leave a jumper installed across the two “Door Ajar Switch” terminals.

Run shielded twisted pair wires (22–24AWG) from the “Speaker” terminals on the rear panel of the AT&T Door Phone Controller (13 & 14) to the installed Door Speaker (1 & 2). Connect the shield to the “Shield” terminal on the controller (12).

Run 2 wires (22–24AWG) from the “Door Bell Button”

2. terminals (10 & 11) to the door bell push button on the installed door speaker/push button assembly (3 & 4).

Run 2 wires (22-24AWG) from the optional “Door Ajar

3. Switch” terminals (8 & 9) to the installed door ajar switch.

Remote Door Open Switch (optional)

A remote door open switch (normally-open contact) provides additional means for opening an electric door opening device. To connect wires for a remote door open switch use the diagram in Figure 2-5 and follow the steps below.

1. Install the remote door open button in desired location using manufacturer’s installation instructions.

2. Run 2 wires (22–24AWG) from the installed (normallyopen contact) remote door open switch to the “Remote

Door Open” terminals (6 & 7) on the AT&T Door Phone

Controller back panel (polarity of wires is not important).

Installation Procedures 2-13

SHIELDED, TWISTED PAIR, 24 AWG.

APPROX. 1500 FT. MAXIMUM LENGTH

JUMPER THE TWO DOOR AJAR SWITCH TERMINALS

IF DOOR AJAR DEVICE IS NOT USED

DOOR AJAR SWITCH

NOTE: MAGNETIC SWITCH IS CLOSED WHEN DOOR IS CLOSED

AT&T DOOR PHONE CONTROLLER BACK PANEL

AT&T DOOR SPEAKER AND DOOR BELL

BUTTON

Figure 2-4. Connections for AT&T Door Phone Speaker, Door Button and Door

Ajar Devices

2-14 Installation Procedures

+ 68 hidden pages