INTERNAL MODEM
The internal modern PC board is a FSK (Frequency Shift Key)
data modern designed for asynchronous operation on a voice-
grade telephone line.
Features are:
•
RS-232-C interface to the terminal for transmitted
and received data
•
Forward (receive) channel l300-Hz mark, 2l00-Hz
space binary, FSK modulated signal
•
Reverse (transmit) channel 390-Hz mark, 490-Hz space
binary FSK modulated signal.
•
Receive data rate up to 1200 bps
•
Transmit data rate 0 to 150 bps
•
Line impedance is 600 ohms balanced
on unconditioned
dial-up line
•
Operation is full duplex on a two-wire, dial-up line
•
Transmitter output level is -9 dBm (+0, -4 dBm)
•
Receiver input level is from -10 dBm to -43 dBm
POWER SUPPLY
The basic power supply is designed for l20-V ac, SO/60-Hz,
or 220/240-V ac, SO/60-Hz input.
However, the 220/240-volt
operation requires a different ac entry panel.
Regulated
output voltages generated are:
•
+55 volts
•
+12 volts
•
+5 volts
•
-5 volts
•
-12 volts
82100083
B
1-5
I
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