General Description; Unpacking; Mechanical Installation - ASL INTERCOM PS 4379 User Manual

2.0 GENERAL DESCRIPTION

The PS 4379 is designed to be a four channel loudspeaker
master unit in an ASL Intercom system and can be used in
portable as well as fixed applications.
It incorporates a power supply, auxiliary inputs, program
input, headset connector, loudspeaker and a gooseneck
microphone, stage announce output, IFB Mode, Paging
Mode, Near Station Mode and Extended Mode (see section
9 for further explanation of each Mode) and provides full
duplex communications within an ASL intercom system. The
PS 4379 RM model has a small built-in electret microphone.
The power supply supplies power to a max. of 40 Beltpacks
or 20 Speaker Stations.
Each channel has a Volume (listen level) control, a Talk and
Call button with LED indicators and a two-stage sidetone
trimmer. A master volume controls the total speaker/headset
volume.
The unit is equipped with a limiter for the gooseneck micro-
phone, allowing the user to speak close into the microphone
without giving rise to overload and distortion. Loudspeaker
dimming is automatic when the microphone is active. Private
conversation may be carried out via the headset connector
with a headset or telephone handset. When a headset is
connected, both gooseneck microphone and speaker are
switched of automatically. The speaker can be then switch
on again with the Speaker on/off button.
As an option, a XLR-6 headset connector can be fitted for
binaural use of the headset. By setting internally mounted
jumpers, each of the 4 channels can be assigned to either

3.0 UNPACKING

The shipping carton contains the parts listed below:
` * The PS 4379
* User manual
* 19" rackmount flares
If any are missing, contact your dealer.
ASL has taken great care to ensure this product reaches you
in flawless condition.
4.0 INSTALLATION
This PS 4379 will form part of an existing or new intercom
system, and connection to it is straightforward.
Adequate ventilation must be provided by allowing sufficient
space around the sides and rear of the unit to ensure free
circulation of air. Forced cooling is not required. The power
supply is mounted on the bottom of the unit, and after a peri-
od of time it will feel hot to the touch at the bottom. This is
normal, and should be no cause for alarm.
To connect the PS 4379 onto the intercom system, use pro-
fessional flexible microphone cable with 2 wires and 1 shield
only.
4
* power cable
* 2 x Fuses
User Manual PS 4379 - Issue 1 © 2007 ASL Intercom, Utrecht, The Netherlands
the left or the right headset can, or to both headset cans.
An electronically balanced input allows volume controlled
monitoring of the audio signal. This is for local use only, it
will not appear on the intercom lines.
Special attention has been paid to the intelligibility of speech.
By applying low noise/high speed op-amps, a speech pre-
sence filter and a specially developed high power bridged
headphone amplifier, communication is very comfortable
even in environments with high background noise level.
There is a separate amplifier for the loudspeaker.
The unique CALL system provides both a flashing red LED
and a very distinctive and characteristic sound signal. A
short push of the CALL button will make the LED flash. The
Call sound signal (buzzer) will be activated when holding the
button for two seconds. In case the sound signal is un-
desirable, all buzzers can be muted with the "All buzzers
on/off" button and the volume of the buzzer can be adjusted
at the front panel.
The pre-amplified microphone signal is electronically balan-
ced available at a 3 pin male XLR. This signal can be sent to
paging systems.
Fully electronic switching increases reliability and allows for :
- 'soft' microphone ON switching, latched or
momentary
- remote Mic Mute facility.
- automatic speaker attenuation (adjustable), when
the microphone is activated.
After unpacking the unit please inspect for any physical
damage to the unit, and retain the shipping carton and
relevant packing materials for use should the unit need
returning.
If any damage has occured, please notify your dealer imme-
diately so that a written claim can be initiated. Please also
refer to the guarantee section of this manual.
Connect the system intercom cables into the LINE connector
sockets on the rear panel. Finally, when private conversation
is desired, connect the headset plug into the headset con-
nector on the front of the front panel.
The PS 4379 is fully protected against mis-wiring (reverse
power) or short circuit in the interconnect cables.
A special kit is included for mounting the PS 4379 in a 19"
rack, taking 2U of rack-space.