Pub. 42004-665L2C
Page/Party® Line Extender
Page: 5 of 18
f:\standard ioms - current release\instr. manuals (42004)\42004-665l2c effective 4-10.doc
03/01
Page Line Audio Detector Output
The Page Line Audio Detector indicating output activates in response to the presence of audio on the
page line and is typically used to control an external dc-coil relay. Its polarity-sensitive, single-pole
single-throw (SPST) solid-state relay contacts are rated at 200 mA and can switch 0 to 28 V dc. A typical
application of this output is shown in Figure 3.
+
+
EQUIVALENT
OR
1N4007
COIL
RELAY
0 TO 28 VDC
OUTPUT -
Model LE100
-
Figure 3. Output Application
Page Line Ground-Fault Detector Output
A ground fault occurs when one conductor of the page line is shorted to earth ground. This condition
generally causes noise (buzz or hum) to be inducted onto the page line and broadcast from the speakers.
The Line Extender is capable of detecting a ground fault and activating an output. The output will
activate if less than 5,000 ohms of resistance is measured from either conductor of the side of the page
line to ground. The output is typically used to control an external dc-coil relay. Its polarity-sensitive,
SPST solid-state relay contacts are rated at 200 mA and can switch 0 to 28 V dc.
Note that the page line ground-fault detector output only responds to ground-faults occurring on the page
line of its corresponding system cable. A typical application of this output is shown in Figure 3.
Page Line Monitor Output
This audio output monitors the audio present on the page line. It provides a balanced output capable of
driving 0.775 Vrms into a 600-ohm load at 1 kHz and is typically used to drive the input of a central
amplifier.
Auxiliary Inputs
The Line Extender provides connection points for external inputs, either normally open (N.O.) or
normally closed (N.C.) voltage-free contacts. Each input activates with a minimum closure duration of
50 ms. The activating contact closure can be located up to one mile from the Line Extender using
24 AWG wire or larger. Each input controls the corresponding auxiliary outputs on the companion Line
Extender unit.
