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****** Page 1 ****** BOGEN Digital Feedback Terminator Model DFT-30 00000 BOGEN. PLAY RECORD DFT-30 FEEDBACK TERMINATOR æccm Printed in USA 54-5926-01 Specifications subject to change without notice.
****** Page 2 ****** Specifications Input voltage: Input current: Input sampling rates: Audio input impedance: Input level range: VOX sensitivity: DTMF sensitivity: Line output imFdance: Gain through line output: Speaker output impedance: Maximum output level : Control input requirements: Control output characteristics: Connector type: Description 24VDC 250mA maximum 32 or 64kBPS, switch selected 6(X) ohm, transformer isolated -3(kiB to + adjustable -3(hB to +10dB, adjustable -22dB to + 10dB, adjustable ohm, transformer isolated OdB typical 1 ohm, transformer isolated 0.4 watts into 8 ohms Contact cl(N1re, 250msec duration. All inputs optically isolated and can be activated by dry contact or solid state open collector. Form C relay outputs, Contacts rated 24VDC @ 1 amFEre, non-inductive 25-lxsition, type 66 connector block The Bogen DFB30 Digital Feedback Terminator is a record/play unit designed to eliminate feedback in paging systems. It digital technolog to store and then repeat a page over the loudslxaker system. It is useful for high noise areas, where amplified audio output induces feed- back into the system. It includes several versatile features which can field-selected to meet different needs. nie DFT-30 installs easily between the paging system amplifier and the telephone system. It can be connected to Key system or PBX page prts (supplying a dry audio pair and normally 01*n contact cl(3ure) or to Key/PBX loop start trunks or PBX station IX)rts using the Bogen Model TAMB access The unit offers a choice of ohm line output or 8 ohm output to the paging system amplifier. The unit includes flanges for wall mounted installation. All connections are to a punch dc»m on the front Connections include relay contacts (4), audio input and output, pwer supply, and lines for remrd, play and atxrt functions. Configuration switches, screwdriver-adjus- table controls and function indiætor LEDs are also lcxated on the front panel. ne unit from 24VDC (Bogen PRSASAC rmter supply recommended, not included). Field-selectable operational features include: Recording time of 30 or 6() semnds. Play the page once or twice. Preannounce tone included. Pre-page pause time of 1, 3, 5, or 10 seconds. field-selected RECORD, ABORT and PLAY options. 2 Important — Before you install this equipment, you should read and understand these instructions. Installation The DFT-30 is designed for wall-mounted installation to a telephone equipment backboard and requires 8″ x 8″ of wall space. mounting location should be near an AC outlet. Keyhole slots are provided to speed installation. Use ap- propriate hardware if mounting to drywall or similar thin materials. Note Lb not install the unit closer than 18″ from a power supply or other equipment that generates electrical noise. Connections All connections are made to the 66-type punch-down block on the front panel. Use ofa punch-down ttX)l and wire cx)mpatible with type 66 blocks will ensure proper connection. Basic connections are described on page 3. The numbers in parenthesis are punch-down terminal numbers as printed on the front panel.
****** Page 3 ****** Input From the Paging System Inctallation drawin5 are included in this manual (see 5 through 8) as follows: • figure 1 shows the connection to a page • figure 2 shÜ*$ the mnnections and required to add a busy tone to the page prt when the unit is in play figure 3 shows toa trunk, using the Bogen TAMB accßsory to prwide contact clcsure. e figure 4 sho;vs to a PBX station prt using the TAMB . (1/2) AUDIO IN a—, Tansformer isolated, input with dc bl(Xking audio leveLs from -15dBm to higher the nominal signal level applied within the limits, the the signal-to- noise ratio. Output To Paging System Outputs are separately adjustable. (3/4) LINE OUT Line level, ohm, transformer-isolated output. Generally, this connection is made to an amplifier’s Lo-Z input jack (not a MIC input). (5/6) 8 011M OUT 8 ohm output, transformer-i.solated for connecting to amplifiers requiring higher input level (AUX inputs). Control Lines Control terminals (8 – 11) are biased around 12VDC 1b activate, the terminal should be shorted to COM (terminal 7). (7/8) RECORD Activates RECORD mode. unit as long as the contact is maintained or until memory æpacity is reached. (7/9) PLAY — Activates play-on-demand when this feature is selected (see Set Play Option.s, no necessary for basic (7/10) ABORT — Forces the DFT-30 to stop operation im- mediatety (no connection for basic 01*ration). (7/11) AUX— Not used. Output Relays Each Form C relay output listed t*lmv includes normally clsed, n and normally The labelling on the front panel shov,s the relay in the idle state. (12 – 14) PLAY Active only while the unit is in the PLAY (15 – 17) RECORD Active only while the unit is in the RECORD mode. (18 – 20) BUSY 1 —Active while the unit is in the RECORD or PLAY mcxie or delay before playback. (21 – 23) BUSY 2 — Active while the unit is in the RECORD or PLAY or delay t*fore playback. Power This unit requires the use of an appropriate rE*ter supply. ne Bogen PRSASAC psver supply is recommended for this put-pse. PRSASAC provides 24VDC @450mA from a 120VAC source. (24/25) 24VDC — 24VDc @ 250mA via suitable supply. Connect the output of the supply to the 24VDC terminals t*fore plugging the supply into an AC outlet. Be certain to observe correct Caution Before pluging the pwer supply into the AC outlet: e Be sure all wiring is proEErly installed. Set the configuration/option switches as described belov.’ under field Setup Options. e Read section Field Setup Options Two miniature switch blocks are used to set the configura- tion of the DFT-30. -mese switches are accessible by remov- ing the plastic wver on the upper right corner of the front paneL Use a Pinted instrument (i.e., tip) to move the switches up-to-on and down-to-off pcsition according to the instructions which Switches 1 – 8 (Left Bank) Set Recording Length Sets the digital sampling rate to control recording time. #1 OFF #1 ON 60 seconds at 32 k.BPS 30 seconds at 64kBPS DTMF Options Lets DFT-30 remrd DTMF tones for special applications or use DTMF to abort or*ration. #2 OFF, #2 ON, #2 OFF, #2 ON, #3 OFF #3 OFF ON No restrictions on DTMF tones Records 2 DTMF tones aborts operation on third Records 1 DTMF tone, aborts operation on second Abort with first DTMF tone 3
****** Page 4 ****** Method of Activation Note: RECORD be activated by the dry contact (ter- minai< 7, 8) regardless of the switch setting. #4 ON/OFF Activate RECORD by DTMF Recording will start when the DTMF tone is detected. Recording will end 03 seconds after the end of audio detec- tion. ON/OFF Activate RECORD by audio detection Recording will start at the txginning of the actual paging and will end 03 seconds after end of audio detection. Set Play Options These select play options. The unit set to rerEat a recording or twice (normal or to play one recording on demand, in reslx)nse to a contact clsure. #6 OFF, #6 ON, #6 OFF, #6 ON, #7 OFF OFF ON Play for duration of closure on the PLAY terminals Play once with momentary contact on PLAY page once (normal 0Fration) Playback page twice (pause time set i*low) Preannounce Tone This switch selects a single-burst tone signal before the initial playback. #8 ON/OFF Preannounce Tone Switches 1 – 4 (Right Bank) Set Delay Before Playback Sets the delay time RECORD and PLAY and any playback (when set to playback twi9. #1 OFF, #1 ON, #10FF, #1 ON, #2 OFF OFF ON #2 ON 1 second delay 3 econd delay S second delay 10 second delay Switches 3 and 4 are not used. Operation After completing all connections and double checking the wiring, remove the plastic cover on the front panel to expose a bank of screwdriver-adjustable controls. Rotate each con- trol and set to its mid BSition. Do not force the controls. Plug the supply into an AC outlet. Tne POWER LED will illuminate. If the LED does not light, check for proper connection at the p,ver supply terminals (reversed polarity will not damage the unit.). Dial up to system and make a page. When the DFT-30 is activated by contact clsure (or DTMF tone/audio sensing options), the RECORD and BUSY LEDs illuminate. When you hang up the phone, the PLAY and BUSY LEDs will light and you will hear the page over the system speakers (following the prßet delay time). When the page is complete, the unit will return to the idle state, ready to record the next page. Adjustments To adjust the unit for optimal performance, remove the cover on the front panel to the controls. Record a page. If the playback is distorted, decrease the output level slightly by rotating the LINE OUT (or 8 OHM) If the playback still sounds dis- torted, decrease the signal level reaching the audio prcxessor by rotating the LINE IN control counterclockwise. If using DTMF options, you can adjust the signal levcl reach- ing the DTMF decoder by rotating the DTMF control. Countercl(Xkwi.se rotation reduces the level. The audio detection sensitivity is controlled with the VOX Rotate cl(Xkwise if the first word is dropped from playback. Maintenance & Warranty Repair The DFT-30 requires no periodic maintenance. If this unit requires repair send it freight prepaid and fully insured to Bogen Service Department, 50 Spring Street, Ramsey, NJ 07446. If use the original packaging material to ensure safe shipment. Enclose a copy of your purchase order/receipt showing date purchased for repair under terms of the warran- tye ne unit will promptly repaired and returned to you (freight prepaid while under warranty). Important Note: The 8 OHM and LINE ocr screening on the unit is reversed. 4 ****** Page 5 ****** KEY SYSEM/ PAGE PORT Figure 1 Connection of DFT-30 to Page Port Page prt must supply a dry audio pair and a normally open contact clsure. The a)nnections shown are for the telephone system only. You must the appropriate output terminals (LINE OUT or 8 OHM) to the sound system amplifier. Generally, the LINE OUT terminals connected to the Lo-Z or input of the sound system amplifier (not a MIC input) Tie 8 OHM output terminals Gin used to drive a speaker directly or be used to connect with amplifiers that require a higher input level (such as an AUX input). BOGEN. PLAY POWER o cog setup REFER to DFT-30 OIGITAL FEEDBACK TERMINATOR RECORO 00 UOOEL PRS-AS-A-C CAUTION INOOOR USE ONLY DATE COOE ****** Page 6 ****** BOGEN O o o Figure 2 "OOEC TG-4C TCNE LEVEL o PITCH O 00 orv BOGENS PLAY POWER systeu setup to UANUAL DFT-30 OIGITAL FEEDBACK TERMINATOR z 0 REU STATUS voc RECORO BUSY auoto IN coy TBA SIG OUT KEY SYSEM/POX PAGE PORT Connection of DFT-30 to Page Port with Bogen Model TG4C Tone Generator Tie TG4C places its tone signal on the page prt's audio pair during playback to indicate a busy condition. Ihe prt must be oftwo-way communiætion for this to work. 0000 PLAY RECI*O BIJSYt MODEC PRS-AS-A-C CAUTION 'NOOOR USE ONLY OATE CODE Make sound system as described in Figure 1. Consult TG4C operating instructions for adjustment infor- mation. ****** Page 7 ****** KEY SYSEM/PBX LOOP START TRUNK TAM B FOR systcu to DFT-30 DIGITAL FEEDBACK TERMINATOR BOGEN. PLAY o supper vox OFF sq.S2 ss St.S2 access exr ccosuge POWER $24.48 vox oecay PAGING RECORO RECC*O eus•rt ejßY2 usa UOOEL PRS-AS-A-C CAUTION INDOOR USE ONLY OATE COOE 'f Figure 3 Connection of DFT-30 to Loop Start Trunk using Bogen Model TAM B Access Module Consult instruction supplied with the TAMB for information on setting and Note that some telephone systems require that the TAMB supply 48 volts at its T and R terminals. In this the 24 volts from the PRSASAC to the TAMB and use a separate 48 volt supply (PRS48 recommended). Make sound system connections as described in figure I. A busy signal added to the loop start configuration by adding a TG4C löne Generator. Follow figure 2 and use the TAMB "PT/?R" terminals as a page port dry audio pair and the N.O..COM terminals as the normally open contact cksure, ****** Page 8 ****** ANALOG STATION PORT PBX TAM B VOX BOGEN. PLAY POWER SEtue TO DFT-30 DIGITAL FEEDBACK TERMINATOR RECORO MOOE a VOC SUPPLY TONE TONE vox otsagce vox OFF ss.S2 ss OH sm.sa access eoouce PAGING output CONTACT CLOSURE voc. Figure 4 VOX Connection of DFT-30 to PBX Station Port using Bogen Model TAMB Access Module This mnfiguration automatically causes a busy signal when the normally from the DFT-30 are connected act(S the station line. Make sound system as described in figure 1. 0000 m..AY Recou gusyt II MOOEL PRS-AS-A—C CAUTION INOOOR USE ONLY DATE COOE Note that ne TAMB requires no pv.rer supply in this con- figuration. TAMB obtains its pmver from the station line. Also note that the DFT-30 is not apprwed by the FCC for direct connection to CO lines. This figure illustrates connec- tions to PBXStation lines only.
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