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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 start 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 (see the Inhibit
(section above), 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.
In order to achieve maximum performance from
their talkback system, the user should be given
the following instructions:
A) The calling party should speak directly into
the telephone mouthpiece and should avoid
speaking too softly.
B)
The called party should pause
(approximately 1/2 second) before
responding to the calling party
.
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