GAI-Tronics 495-001 Mine Dial / Page Phone Interface Cabinet - Manual (Page 22)

Pub. 42004-198D
Model 495-001 Mine Dial/Page Phone Interface Cabinet Page: 22 of 22
f:\standard ioms - current release\42004 instr. manuals\42004-198d.doc
10/11
Specifications
Model 491 Mine Dial/Page Phone
Line voltage ....................................................................................................................................... 12 V dc
Supervisory current...................................................................................................... 20 mA dc, maximum
Audio impedance, input .................................................................................................. 200 ohms, nominal
External controls (two) ......................................................................... Push-to-operate switch (in handset),
Emergency page switch (on panel)
Internal controls (two)......................................................................................................... Speaker volume,
Sidetone
Microphone ........................................................................................................... Dynamic, noise-canceling
Speaker....................................................................................................................... Dynamic, horn-loaded
Power supply................................................................................................... Internal dry cell battery, 12 V
Page/indicator lamp ................................................ Approximately 66 flashes per minute; 6.6% duty cycle
Model 495-001 Interface Cabinet
Number of channels .................................................................................................................. 80 maximum
Audio impedance to switchboard............................................................................................ 600–900 ohms
Metering....................................................................................................................... Power supply voltage
Load current
Battery charging current
Transient isolation-telephone circuit to corresponding mine circuit................................... 500 V, minimum
Transient limiter - across mine lines ............................................................................................. 25 V, peak
Normal power requirements ...................................................................... 120 V,
± 10%, 50–60 Hz @ 2 A
240 V,
±10% @ 1 A, optional
Standby power operation ........................................................... 8 hours, minimum via rechargeable battery
Switchboard Requirements
Station selection .................................................................................. DTMF (Dual Tone Multi Frequency)
Open-circuit voltage........................................................................................................... 48 V dc, nominal
Loop current............................................................................................. 50 mA nominal, 20 mA minimum
Auxiliary requirements
Page audio:.......................................................................................... Nominal 0 dBm, 600–900 ohms
Page control: ........................................................................................................ A: contact, nor. Open
Monitor: ................................................... 48 V dc nom. 1200 ohms maximum source/line resistance
FCC Information
FCC Registration #: ................................................................................................... ADG9ZP-67312-KF-E
REN #: .....................................................................................................................................................0.1B