GAI-Tronics 69255-001 Page/Party Interface PCBA - Manual (Page 9)

Pub. 42004-608L2B
69255-001 Page/Party
®
Interface PCBA Page: 9 of 10
f:\standard ioms - current release\42004 instr. manuals\42004-608l2b.doc
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Specifications
Electrical
Power requirements .............................................................................................. +5 V dc from backplane
+12 V dc from backplane
−12 V dc from backplane
Current draw ...................................................................................................Nominal +5 V, 135–420 mA
+12 V, 120 mA
−12 V, 75 mA
Connections.................................................................................... Two (P1, P2) × 64-pin DIN connectors
Inputs/outputs........................................................... Page Line, 33 ohms, 250–6000 Hz, 1.5 V
RMS
nominal
Party Line 1, 33 ohms, 250–3500 Hz, 1.5 V
RMS
nominal
Party Line 2, 33 ohms, 250–3500 Hz, 1.5 V
RMS
nominal
RS-485 Line, dry contact closure input, normally open, maintained
External relay control output, 110 mA short circuit current
Data communications............................................................................... 2400 baud FSK modem/RS-485
Off hook detection ............................................................... Less than 120 ohms across Party Lines 1 & 2
Ground fault detection ............................. Less than 5000 ohms to ground for Page Line and Party Line 1
Output .................................................................................................. 1.5 V
RMS
nominal into 33-ohm load
Frequency response......................................................................... 325-7000 Hz, +0, −3 dB ref. to 1 kHz
Distortion ........................................................................................................... 1.5% max. THD @ 1 kHz
FSK output to line................................................................................. 0.7 V
RMS
, 2 Vp-p into 33-ohm load
FSK frequencies............................................................................................................ 30.720 kHz (Mark)
32.914 kHz (Space)
Front Bezel Controls ...........................................................................Monitor Speaker Level Adjustment
Page Line Balance Adjustment
Front Bezel LED Indicators
On Line (green - on/off).............................................................................................. Lit when operational
RTS (yellow - flashes) .................................................................... Indicates FSK or RS-485 transmission
EOL Fault (red - on/off)................................................................ Indicates no response from EOL station
Ground Fault (red - on/off) ........................................................................................Indicates ground fault
Front Bezel Controls
Monitor Level ................................................................................Volume adjust for the Monitor Receive
0.5-1.8
V
RMS
into 33 Ω useable adjustment range (with 1.5 V
RMS
across backplane)
Page Balance............................................................................................................. Sets page line loading
15 to 115-ohm adjustment range