AT&T Digital Feedback Eliminator and Auto-Page Repeater Installation and Use
AT&T 463-248-107 0II722700-007 Issue 2, November 1993 Copyright 1993 AT&T All Rights Reserved Written/Printed in U.S.A. Notice Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing. However, information is subject to change. Trademarks PAGEPAC, PAGEPAC PLUS, PAGEPAL, and AMPLICENTER are a trademark of HARRIS CORPORATION. Warranty AT&T provides a limited warranty for this product.
Contents 1. ■ ■ ■ ■ ■ ■ ■ ■ ■ 2. ■ ■ ■ ■ ■ ■ ■ Important Safety Instructions Example System Setup Installation Steps Tools Required Mounting the Unit Power Connections Connecting to the Paging System ■ 1-4 1-5 1-6 2-2 2-4 2-5 2-5 2-5 2-6 2-6 3-1 3-2 Automatic Operation Setting Option Switches 3-2 A-1 Warranty Information ■ 1-2 1-2 1-2 1-3 1-3 1-4 2-1 Operation ■ A.
Overview 1 Contents About This Guide How to Use This Guide Reference Materials How to Comment on This Guide Shipping Container Contents Ordering Information Features and Capabilities Specifications Hardware Configuration 1-2 1-2 1-2 1-3 1-3 1-4 1-4 1-5 1-6 Overview 1-1
The following paragraphs give a summary of this guide, and the features and installation summary for the AT&T Digital Feedback Eliminator (DFE). About This Guide This installation and use guide explains the installation and configuration of the AT&T Digital Feedback Eliminator. It gives interface instructions to other communications equipment. It is intended that Digital Feedback Eliminator be installed by a trained telephone, audio, or electrical installer with basic electronic knowledge.
How to Comment on This Guide Send your comments and recommendations for changes to: M. McGinnis 809 Calle Plano Camarillo, CA 93012-8516 FAX: (805) 987-2547 Shipping Container Contents The following items should be found in the PagePac Plus Controller shipping container. If something is missing, notify your local dealer.
Ordering Information Equipment is available from many AT&T sources. Contact any of the following for sales information and advice on the equipment that would best meet your needs: AT&T AT&T AT&T AT&T ■ Catalog Sales Sales Office Phone Center Store Authorized Dealer 1-800-451-2100 1-800-247-7000 1-800-222-3111 1-800-247-1212.
Specifications Table 1-1. Digital Feedback Eliminator Specifications Physical Electrical ■ Maximum dimensions: 10.4" (26 cm) wide by 8" (20 cm) high by 1.5" (3.75 cm) deep, including RC-2 interface. ■ Weight: 3 pounds (1.36 kg). ■ Audio Input: 600 ohms, transformer isolated, with DC blocking capacitor, -15 dBm to 4 dBm (nominal -10 dBm) input level. ■ Line Output: Line level (600 ohms), transformer isolated, 10 dBm (maximum) output level.
Hardware Configuration The information key that follows Figure 1-2, illustrates the location of each of the Digital Feedback Eliminator controls and indicators. AT&T INPUT LEVEL DTMF LEVEL VOX LEVEL (RED) POWER (GREEN) PLAY RECORD POWER OUTPUT AUDIO LINE OUTPUT (YELLOW) BUSY (RED) FE-2HDA DIGITAL FEEDBACK ELIMINATOR & AUTO-PAGE REPEATER Figure 1-2.
Power light. Glows RED to indicate that power has been applied to the unit. Play light. Glows GREEN while a message is being played. Record light. Glows YELLOW while a message is being recorded. Busy light. Glows RED while the unit is active, recording or playing a message. Input Level control. Adjusts the volume of the audio input. IMPORTANT! Do not addjust items 5, 6, 7, 8, and 9. These controls are factory set . DTMF Level control. Adjusts the sensitivity of the DTMF decoder circuit. VOX Level control.
Installing the Hardware 2 Contents Important Safety Instructions ■ Additional Safety Instruction for Installation Personnel Example System Setup Installation Steps Tools Required Mounting the Unit Power Connections Connecting to the Paging System 2-2 2-3 2-4 2-5 2-5 2-5 2-6 2-6 ■ Using an RC-2 Pro Interface Connector 2-7 ■ Control Inputs 2-8 ■ Control Outputs 2-8 ■ Using an Amphenol Connector 2-9 Installing the Hardware 2-1
This section provides complete instructions for mounting the Digital Feedback Eliminator on a wall or table. It also illustrates all interface requirements to auxiliary equipment, including inputs and outputs. DIP switch settings are provided. Important Safety Instructions Always follow these basic safety precautions when using the system: 2-2 Installing the Hardware 1. Read and understand all instructions. 2. Follow all warnings and instructions marked on the product. 3.
Additional Safety Instruction for Installation Personnel 1. DO NOT install telephone wiring during a lightning storm. 2. DO NOT install telephone jacks in a wet location unless the jack is specifically designed for wet locations. 3. Never touch uninsulated wires or terminals, unless the line has been disconnected at the paging or controller interface. 4. Use caution when installing or modifying paging or control lines. 5. The Digital Feedback Eliminator must be securely wall or table mounted.
Example System Setup The Digital Feedback Eliminator can be configured in several ways depending on the paging system used. The following illustration shows a typical installation. DRY LOOP CONTACT CLOSURE TO START RECORDING RING TIP FROM HOST TELEPHONE SYSTEM AUDIO UNIT POWER 24 VDC OPTION SWITCHES (–) (+) AMPLICENTER 3/4"PLYWOOD TO SPEAKERS Figure 2-1.
Installation Steps These are the general steps for installation. 1. Mount the unit to the wall or table. 2. Make cable connections from DFE to paging system. 3. Set DIP switches to desired unit operation. 4. Power up DFE unit. 5. Test DFE unit. Tools Required The following tools are required for the installation of the unit hardware and cabling.
Power Connections 1. Make sure the 24 Vdc power supply is unplugged. 2. Connect the minus (-) side of the power supply to terminal #19 of the RC-2 Pro interface. 3. Connect the positive (+) side of power supply to terminal #20 of the RC-2 Pro interface. 4. Plug in the power supply. The Power light should glow RED. 5. Turn off the power supply while making other interface connections.
Using an RC-2 Pro Interface Connector The RC-2 Pro Interface Connector (see Figure 2-3) attaches to the Amphenol Interface connector on the Digital Feedback Eliminator. It provides convenient wire access for the power, audio, and control connections to the unit using the screw-down terminals. The terminal connections to the RC-2 Pro Interface are described in Table 2-1. Figure 2-3. RC-2 Pro Interface Connector Table 2-1.
Control Inputs Control common (COM). Serves as common return for all control inputs (REC, PLAY, ABORT). Record control (REC). A closure between this input and Control common (COM) causes the unit to record a message. The recording will terminate when the closure is removed or the maximum record time is reached. The Record control may be used even if the option switches have been set for voice or DTMF activation. Play control (PLAY).
Using an Amphenol Connector If the RC-2 Pro lnterface is not appropriate for your application, you can replace it by running a 25-pair cable with a female Amphenol connector from the interface connector on the Digital Feedback Eliminator to a 66B-type punchdown block in standard color code order. Table 2-2 lists the pin assignments for the Interface connector. Table 2-2. Amphenol Interface Connector Wiring.
Operation 3 Contents Automatic Operation Setting Option Switches 3-2 3-2 ■ Switch Block #1 3-3 ■ Switch Block #2 3-5 Operation 3-1
Automatic Operation Operation of the Digital Feedback Eliminator is automatic once installed and configured. When a page is made, the message is digitized and stored in memory. When the page ends, the digitized message is released to play over the paging system’s speakers. Since the live microphone is off at the time of subsequent amplified page, feedback is eliminated. Speakers can thus be set at any volume level.
Switch Block #1 Note: If you change the setting of the Recording Length DIP switch while the unit is powered on, you will have to cycle power (turn the power off and back on again) before the unit will recognize the new setting. ■ Recording Length — This option sets the maximum duration of the recorded message to either 30 at 6.8 kHz or 60 seconds at 3.4 kHz. The recording will automatically terminate at the end of this time, even if the Record contacts are still active.
■ Recording Method — This option specifies whether recording is to be initiated by voice, DTMF, or contact closure. If DTMF activation is selected, the unit will start recording a message after it detects a DTMF tone (caused by the user pressing a key on a touch-tone phone). The tone will not be included in the recording. If Voice activation is selected, the unit will begin recording the moment the user starts speaking.
■ Pre-Page Tone — This option instructs the unit to broadcast a three-second alert tone (the DTMF digit 0) before it plays back the recorded message. The tone will only be played once: it will not be repeated if the Auto-Play Twice option is in effect. (Pre-Page Tone is also called Pre-Announcement Tone.
Warranty Information A Limited Warranty and Limitation of Liability AT&T warrants to you that the product will be free from defects in material and workmanship when title passes to you. If you notify AT&T that the product has failed to operate as warranted within one year of the date title passes to you, AT&T will, at its option, repair or replace the component or components of the product that failed to operate as warranted.
This limited warranty applies only to the product purchased directly from AT&T or purchased directly from an authorized AT&T dealer. You may be required to provide AT&T with proof of purchase before AT&T will perform any warranty repair or provide any warranty replacements. EXCEPT AS SPECIFICALLY SET FORTH ABOVE, AT&T, ITS AFFILIATES, SUPPLIERS AND DEALERS MAKE NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIM ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
© 1993 AT&T All rights reserved Printed in U.S.A.
