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Valcom V-9941A User Manual
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Valcom V-9941A User Manual

One zone handsfree talkback control unit
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ONE ZONE HANDSFREE TALKBACK CONTROL UNIT
INTRODUCTION
The V-9941A is a One Zone Handsfree Page Unit for
use on an Electronic Key system line key position, a
PABX loop start trunk port, a dedicated single line
telephone or a 600 Ohm two-way page port with a
contact closure.
These instructions contain the specifications and
information necessary to install, operate and maintain
the One Zone Handsfree Talkback Control Unit.

SPECIFICATIONS

Purpose
Provides battery feed and loop detect circuitry to
properly interface with a telephone system C. O.
position or dedicated single line telephone.
Provides VOX circuit and handsfree amplifier to
drive 45 Ohm talkback speakers.
Provides 600 Ohm input with ground start input
to operate on E-Key systems with a 600 Ohm
two- way page port and a contact closure.
Applications
PABX loop start trunk port
Electronic key system C. O. Line position
Telephone systems with 600 Ohm two-way page
port and contact closure
Dedicated single line telephone
Refer to Figure 1 for a block diagram of a typical
installation.
NOTE: When used with additional
equipment, the V-9941A can also be
accessed from a push-to-talk microphone for
use in restaurant drive-in windows and other
similar applications. Contact Valcom
Application Engineering for information.
V-9941A
Features
Loop start
Input for ground start from a contact closure
Provides optional battery feed
Built in talkback amplifier
Directly drives up to two talkback speakers
Will drive Valcom one-way amplified speaker
assemblies
Screw terminals for all connections
Initial alert tone option
Repeated alert tone option
Music input
Speaker inhibit option
Operates on -24VDC "B" Battery
Limitations
Maximum of two Valcom talkback speakers plus
40 one-way amplified speaker assemblies.
Maximum allowable cable distance from control
unit to talkback speakers is 800 feet.
Capacity
Each V-9941A will provide one zone of talkback
paging
The V-9941A is a single talkpath unit
Each V-9941A will drive up to two 45 Ohm
talkback speakers
Up to 40 one-way amplified speaker assemblies
may be used in addition to the talkback speakers
1
VSP-V-9941A
Issue 4
947960

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Summary of Contents for Valcom V-9941A

  • Page 1: Specifications

    Repeated alert tone option Music input Speaker inhibit option Operates on -24VDC "B" Battery Limitations Maximum of two Valcom talkback speakers plus 40 one-way amplified speaker assemblies. Maximum allowable cable distance from control unit to talkback speakers is 800 feet. Capacity...

  • Page 2: System Design

    600 Ohm two-way page port with a contact closure or a dedicated single line telephone. The V-9941A contains all the VOX and handsfree amplifier circuitry required to drive up to two Valcom 45 Ohm talkback speakers. Electronic Key, PABX Access or...

  • Page 3: Wiring Instructions

    TO REMOVE COVER LOOSEN SCREW, THEN ACTIVATE LATCH PLASTIC COVER V-9941A 45 Ohm Talkback Speaker ELECTRONIC KEY SYSTEM OR PABX ACCESS INSTALLATION WIRING INSTRUCTIONS: Place a check by each step as it is completed: __ 1. Connect Tip of the telephone system trunk position to the V-9941A terminal 1 (TIP).
  • Page 4 V-9941A 45 Ohm Talkback Speaker ELECTRONIC KEY PAGE PORT CONNECTIONS __ 8. Connect -24VDC ground (+) from power supply to telephone system GROUND. WIRING INSTRUCTIONS: __ 1. Connect Tip of the telephone system 600 Ohm page port to terminal 1 (TIP) of the V-9941A.

  • Page 5: Operation

    Ohms to ground through the “A” lead contacts of the phone and it will turn off the speakers. Since the telephone Tip and Ring has been connected to the Valcom Tip and Ring, the called and calling parties may now converse. An internal relay will automatically connect a music source (optional) to the speakers when the V-9941A is idle and remove the music during a page.

  • Page 6: Technical Assistance

    This warranty is in lieu of and excludes all other warranties, expressed or implied, and in no event shall Valcom, Inc. be liable for any anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection with the purchase, operation or use of the product.
  • Page 7 If your system still does not work, verify proper programming of your phone system. There should not be any type of toll restriction on the port used to access the Valcom equipment. a. Verify talkback speakers are being used.