ASL INTERCOM PS 285 Benutzerhandbuch - Seite 8

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9.0

PARTY LINE, TECHNICAL CONCEPT

ASL s PRO Series offers a complete two way ( full
duplex ) communications system.
Users of the system are connected via a party line .
Master stations (with built-in power supply), beltpacks,
speaker stations and power supplies are
interconnected via standard microphone cable. One
wire is used as an audio line, one as a power line and
the screen of the cable functions as earth/return.
Current drive is used for signal transfer. Each station
utilises a current amplifier to amplify the microphone
signal and place it on the common audio line where,
due to the constant line impedance (situated in the
power supply between XLR pin 3 and 1), a signal
voltage is developed which can be further amplified
and sent to headphones or loudspeakers.
This principle has three advantages:
-
the use of a single audio line allows several
stations to talk and listen simultaneously.
-
due to the high bridging impedance offered by
each station, the number of stations on line has
no influence on the level of the communications
signal.
-
power and audio to the intercom stations use the
same cable.
The Call signal is also sent as a current on the audio
line. It develops a DC potential over the line
impedance which will be sensed by each station and
interpreted as a Call signal.

10.0 GUARANTEE

This unit is warranted by ASL Intercom to the original
end-user purchaser against defects in workmanship
and materials in its manufacture for a period of one
year from the date of shipment to the end-user.
Faults arising from misuse, unauthorised modifications
or accidents are not covered by this warranty. If the
unit is faulty, it should be sent in its original packing to
the supplier or your local ASL dealer, with shipping
prepaid. A note must be included stating the faults
found and a copy of the original suppliers invoice.
THIS PRODUCT WAS DESIGNED, DEVELOPED
AND MANUFACTURED BY :
ASL-INTERCOM BV
UTRECHT, THE NETHERLANDS
http://www.asl-inter.com
8
11.0 TECHNICAL SPECIFICATIONS PS 285
POWER SUPPLY
mains voltage range
DC ouput voltage
ripple and noise
max. output current
circuit-breaker delay time
automatic reset time
DIMENSIONS AND WEIGHT
width
height
depth
weight
GENERAL SPECIFICATIONS
intercom line impedance
intercom line audio level
dynamic range
call send signal
call receive signal threshold
supply voltage
Note: 0 dBu = 775 mV into open circuit.
ASL reserve the right to alter specifications without
further notice.
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
90 – 230 V 60Hz AC
+30 V +/- 5% DC
< 11 mV rms
1.7 A continous, 3 A peak
0.2 sec.
3.0 sec.
19" (483mm)
1U (44.5mm)
150mm
1.60 Kg
350 ohms (1kHz)
2.2 Kohms (DC)
nom. –18 dBu
Max. +4 dBu
80 dB
+2.8 mA
+2.4 V DC
+30 V DC (12 V to 32 V)