GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 12)

Foreword PL1877A Microprocessor Radio Telephone Interconnect
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Specifications
General
Input voltage ......................................................................................................................... +10.5–16 V dc,
or optional 115 V ac, 60 Hz; 220 V ac 50/60 Hz;
Input current...................................................................................................................... Less than 750 mA
RFI protection .................................................................................................................................... Built-in
Hum and noise ........................................................................................... −45 dB from 1,000 Hz reference
Audio Distortion ............................................................... 1% maximum with reference to a 1,000 Hz tone
(−10 dBm input, phone to transmitter path)
(0.45 V ac input, low level receiver speaker input to phone path)
Circuit loading to TX audio...................................................................... Bridging impedance (ac-coupled)
Output level to radio transmitter......................................................... 15 mV
RMS
to 0.5 V
RMS
into 600 ohms
Output level to phone line............................................. −9 dBm maximum (time averaged over 3 seconds)
Input level from phone line.............................................................................................. +5 dBm maximum
autolevel
threshold:
−35 dBm, +3 dB
Phone line busy detect threshold ................................................................................................−20 V, +2 V
(or 10 V, +2 V with 24 V threshold user selectable)
Phone line ring detect ......................................................................... Adjustable from 20 V
RMS
to 50 V
RMS
Ringer equivalence ............................................................................................................ 0.0B (ac)/4.9 (dc)
Input Audio Level from Receiver
High level discriminator/detector .................................................................................... 0.45 V
RMS
+8 dBm
Low level discriminator/detector ........................................................................................ 80 mV
RMS
+8 dB
High level flat audio .................................................................................................. 2.5 V
RMS
+6 to -8 dBm
Low level flat audio ............................................................................................................ 0.45 V
RMS
+8 dB
Impedance .............................................................. 600 ohms or high impedance bridging (user selectable)
Audio Frequency Response
RX to land-line.......................................................................................................... 360 to 3,000 Hz, +3 dB
Land-line to transmitter ............................................................................................ 300 to 3,000 Hz, +3 dB
(−45 dBm input, phone-to-transmitter path 45 mV ac input,
low level flat input to phone line path, auto-level disabled)
Logic Level Inputs
Input impedance.............................................................................................................................. 90k ohms
(inputs pulled up through 100K ohms to power input voltage)
Maximum low level input..................................................................................................................... 1.5 V
Maximum high level input.................................................................................................................... 3.5 V
Maximum high level ............................................................................................................................ 100 V
Physical
Temperature range .................................................................................................................. 0º C to +60º C
Humidity .............................................................................................. <95% at relative humidity at +50º C
Dimensions ..................................................................................................... 7.0 W
× 8.3 D × 1.5 H inches
Weight......................................................................................................................................... 26.9 ounces