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Bosch Security Systems | 2011-02
2011-02 | Installation and User Instructions | 5 | Call Stations en | 239
20.6.9 Headset
20.6.10 Control inputs
Connector:
3.5 mm (0.14 inch) jack
Electret impedance:
1 to 10 kohm
Microphone input sensitivity:
-47 to -32 dBV/Pa (tolerance ± 3 dB)
Signal/Noise ratio microphone:
60 dB at -38 dBV/Pa (tolerance ± 3 dB)
Earphone impedance:
32 ohm
Signal/Noise ratio earphone:
80 dB at max. output (tolerance ± 3 dB)
Cross-talk (earphone to microphone):
< 40 dB at -42 dBV/Pa and 1 kHz (tolerance ± 3 dB)
Output power:
1 mW
Total cable resistance:
< 1 kohm (with line supervision)
< 5 kohm (without line supervision)
Resistance detection (supervision enabled):
Cable short circuit
< 2.5 kohm
Contact closed
7. 5 k o h m to12 kohm
Contact open
17. 5 k o h m to 22 kohm
Cable broken
> 27 kohm
Resistance detection (supervision disabled):
Contact closed
< 12 kohm
Contact open
> 17.5 ko h m
External contacts:
Voltage-free closing or breaking contacts (relay
contacts, mechanical switches, mercury contacts
etc.)