General Description; Unpacking; Mechanical Installation - ASL INTERCOM PS 279 User Manual

2.0

GENERAL DESCRIPTION

The PS 279 is designed to be a master unit in an ASL
intercom system and can be used in portable as well as
fixed applications. It incorporates a dual channel intercom
line power supply with auxiliary input, a dual channel
headset station and uses only 1U of 19" rack space.
This makes the PS 279 very versatile and ideal for use in
applications where standard microphone cable is available
and ease of setup is of paramount importance.
Each channel has a Volume (listen level) control, a Talk
and a Call button with LED indicators and a side tone
trimmer.
The intercom line power supply is fully protected and can
drive at least 20 beltpacks operating at full power.
The power supply is completely separated from all other
functions and in case of power failure, the unit will accept
line power from an external ASL power supply.
Since the power supply provides the line impedance, one
would generally only use one PS 279 on a 2-channel
Intercom system.
Should you want to connect a PS 279 to another
Intercom system, the 'System link' connector at the back
of the unit has to be used to avoid impedance problems.
If the number of beltpacks/speaker stations exceed the
capacity of the PS 279 power supply, a booster power
supply (PS 285) can be used.
3.0

UNPACKING

The shipping carton contains the parts listed below
* The PS 279
* Mains power cable
* Spare fuses
* User manual
If any are missing, contact your dealer.
With the PS 279 will be a small packet of spare fuses.
Please keep them in a safe place.
There is also one spare fuse included in the mains inlet.
4.0

MECHANICAL INSTALLATION

A vertical rack space of 1U (1.75", 44mm) is required for
the PS 279. It is not necessary to provide rear support by
extra bracing or shelving.
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.
4
Special attention has been paid to the intelligibility of
speech. By applying low noise/high speed circuitry, a
speech presence filter and a specially designed high
power headphone amplifier, communication is very
comfortable even in environments with a high background
noise level.
The unique CALL system provides both a flashing red
LED and a very distinctive and characteristic sound signal.
Only 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 undesirable, all buzzers can be muted with
the "All buzzers on/off" button.
Fully electronic switching increases reliability and allows
for:
- "soft" microphone ON switching, latched or momentary
- remote Mic Mute facility. All microphones of stations
connected to the PS 279 can be muted by pushing a
single front button.
An Aux input at the rear panel allows injecting external
audio signals at line level.
An Aux signal can be routed to intercom line A and/or B,
or directly to the local headset.
As an option, an XLR-6 headset connector can be fitted,
allowing the user to hear channel A + AUX program signal
on the left headset can and channel B + AUX program
signal on the right headset can. By changing the position
of internally mounted jumpers, it's also possible to hear
channel A + B on the left can and the AUX program signal
on the right can
.
ASL has taken great care to ensure that this product
reaches you in flawless condition.
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 occurred, please notify your dealer
immediately so that a written claim can be initiated.
Please also refer to the guarantee section of this manual.
The power unit is mounted on the bottom of the unit, and
after a period of time it will feel hot to the touch on top
and bottom. This is normal, and should be no cause for
alarm
User manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands