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APPENDIX C
SX212 MODEM
SPECIFICATIONS
□ □□□□□□□□□□□□□□□□
75-300 bps and 1200 bps
Full-duplex and half-duplex
FCC-registered for direct connection to the
switched telephone network; connects with
RJ11W, RJ11C, RJ12C, RJ13W,
and
RJ13C
modular phone jacks
Tone and pulse (rotary) dialing
1200 bps
Serial, binary, asynchronous, 7 data
bits, 1 or 2 stop bits; odd, even, or fixed
parity or 8 data bits, 1 or 2 stop bits, no
parity
75-300 bps
Serial, binary, asynchronous, 7 or 8
data bits; odd, even, or no parity
Carrier Frequencies
1200 bps
ORIGINATE
Transmit 1200 Hz
Receive 2400 Hz
ANSWER
Transmit 2400 Hz
Receive 1200 Hz
75-300 bps
ORIGINATE
Mark 1270 Hz
Space 1070 Hz
ANSWER
Mark 2225 Hz
Space 2025 Hz
Modulation Scheme
4-level differential phase-shift keyinq (DPSK)
at 1200 bps
Dibit Encoding
1200 bps
Dibit
Phase Shift-
00
+90
01
0
10
180
11
-90
Data Rates
Operation
Registration
Dialing Capability
Data Format
43
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