Valcom ONE-WAY PAGING SYSTEM Manual de usuario descargar pdf (Pagina 5)

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require 1 pair (2 pairs when using speakers with

LEDs or "doorplate speaker assemblies"). One-way

amplified speakers require 2 pairs (Refer to the One-

Way Paging VSP).

MAXIMUM CABLE LENTH TO TALKBACK

SPEAKERS IS 800 FEET

DO NOT SPLIT PAIRS

Grounding

For proper operation, ground of the power supply

must be connected to a reliable ground.

CAUTION: Using an electrical ground may put

noise on the talkback.

High Power Amplifiers

In many cases an existing high power amplifier may

be connected to a zone output of the control unit for

one-way paging. Simply insert a V-1092 volume

control and connect the zone audio output to the

auxiliary input of the amplifier.

NOTE: YOU CANNOT INCREASE THE NUMBER

OF TALKBACK SPEAKERS IN A ZONE THROUGH

USE OF A HIGH POWER TALKBACK AMPLIFIER.

Volume Adjustments

All talkback control units have two volume controls:

1. Speaker to telephone. (Receive) Adjust this

control for minimum background noise.

Between 1/4 and 1/2 is typical.

2. Telephone to speaker. (Transmit) Adjust this

control to provide the desired level of outgoing

page.

If background music is provided or one-way

amplified speakers are being used, the controls

MUST be adjusted in the following order:

1. Speaker to phone

2. Phone to speaker

3. All call level

4. Music level

5. Individual controls on one-way speakers

Inhibit (Speaker Cancel)

Inhibit is an option that may be used with 1A2 Key

Systems or with "A-lead" single line telephones. It

automatically turns off a speaker when the called

party picks up their handset and presses the intercom

button to have a handset to handset call. To wire the

inhibit option, you must place 10K ohm resistors

(included with equipment) in series with the "A"

leads from each telephone's intercom button, or in the

case of dedicated single line set, in series with the

"A" leads from each telephone. The other side of

these resistors will be connected together and

brought to the inhibit lead of the control unit.

REMEMBER: A resistor will be required for each

telephone. If feed cables to several phones are used,

the resistors must be placed at the telephone or the

remote terminal. Contact Technical Support for

additional information.

SYSTEM OPERATION

Circuit Description

Each Valcom Handsfree Control Unit contains access

circuitry, voice switching, and talkback circuitry.

The multizone units also contain dial select circuitry.

All talkback control units are designed for use with

45 ohm speakers. These may be desktop speakers for

intercom applications; or ceiling speakers, wall

speakers, or horns for paging applications. In

addition to the control unit and speakers, a talkback

system may require a -24VDC power supply.

Talkback control units generally will be connected to

a key button of a 1A2 System (line card required

when using the V-9941A, V-2003AHF or the

V-2006AHF), a line key of an Electronic Key System

(line card required) or a loop trunk port of a PABX

(trunk card required).

When accessed by the appropriate method, the

paging party will immediately be connected to the

speaker (single zone unit), or will receive dial tone

(multizone unit). In multizone applications, the

paging party will then dial the zone desired, page,

and receive the reply.

In 1A2 or dedicated stand alone "A-lead type"

telephone applications, the called party has the option

to pick up their handset, depress the intercom button

(in the case of 1A2 equipment), and speak handset to

handset to the calling party. If the inhibit option is

wired [Section Inhibit (Speaker Cancel)], the called

speaker will automatically turn off when a handset to

handset conversation is initiated.

Instructions to User

Valcom talkback equipment contains voice switching

circuitry. This means only one party may be talking

at a time. The voice switch is controlled by the

telephone end. If the calling party is quiet, they can

listen to the speaker.

As soon as the calling party speaks, the voice will

page out of the speaker. If someone at the speaker is

talking, the calling party's voice will override them.

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