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User Manual PS 279 / October 2013 © ASL Intercom BV
19 A & B LINE connectors
These XLR-3 connectors are for connecting the
PS 279 to remote stations via the intercom party
lines. There are 2 connectors for each channel.
Pin assignment: Pin 1: 0V / ground shield
Pin 2: +30V power. Pin 3: audio wire
20 GROUND LIFT switch
If in “lift” position pin 1 of the AUX input
XLR is lifted from ground.
21 AUX INPUT connector
Electronically balanced input for line level audio
signals. Pin assignment: Pin1: 0 V / ground
Pin 2: signal (+), Pin 3: signal ( -)
22 MAINS INLET
IEC Mains connector
23 FUSE
This fuse protects the PS 279 against severe
internal damage in case of malfunction in the
power section. Spare fuses are supplied with
the unit.
Before replacing the fuse the mains cord
must be removed. Make sure that the correct
fuse (T 1250) is placed in the holder.
Mic Gain trimmer
To reach the mic gain trimmer, undo the two
screws at the front panel and the two screws on
the top side. The trimmer is located at the right
front of the unit.
To increase mic gain turn counter clockwise.
To decrease mic gain turn clockwise.
Binaural Jumper Settings
For binaural use of the PS 279, the unit must
have an XLR-6 headset connector.
The binaural configuration is set as follows:
Jumpers J3 in position A:
Left can: Channel A and B
Right can: AUX signal
Jumpers J3 in position B:
Left can: Channel A and AUX signal
Right can: Channel B and AUX signal
8.0 TECHNICAL SPECIFICATIONS
System
Dynamic range: 80 dB
Frequency response: 200 Hz – 15 kHz (-3 dB)
Call send signal: +2.8 mA
Call receive signal threshold: +2.4V DC
Operation voltage: 24 - 32 V DC
Power interrupt time (mic mute): 0.1 sec.
Line Impedance: 350 Ω (1 kHz) / 2.2 kΩ (DC)
Audio level: nom.-18 dBu, max. 0 dBu
Switch Mode Power Supply
Mains voltage: 100 - 240V AC, 50/60Hz
Output voltage: +30V DC (+/- 5%)
Max. output power: 75 Watts
Circuit breaker delay time: 0.2 sec.
Automatic reset time: 3.0 sec.
DC Input Supply voltage: 24 – 30 V DC
Mic. Pre-amp
Gain: 40 - 60 dB (adjustable internally)
Presence filter: +6 dB at 5 kHz
Power to electret mic.: +9 V DC
Headphone Driver Amps
Max. output level:
monaural: 16 Vrms (@ 200 Ω
binaural: 2 x 10.3 Vrms (@ 400 Ω
Max. output power:
monaural: 1.3 Wrms (@ 200 Ω
binaural: 2 x 0.27 Wrms (@ 400 Ω
Side Tone Rejection: 0 - 30 dB adjustable
Buzzer: Max. SPL: 85 dBA
Aux input (Line level)
Input impedance: 39 kΩ
Nominal input level: 0 dBu
Max. input level: +21 dBu
Dimensions & Weight
Width: 19" (483 mm) / Height: 1RU (44,5 mm)
Depth: 150 mm / Weight: 1.85 kg
0 dBu defined as 775 mV into open circuit
ASL reserves the right to alter specifications
without prior notice
(11 strony)
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