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CHAPTER 1: Introduction and Description
Mode of Operation Full duplex over both dial-up lines and
2-wire or (336+ [MD1640A] only) 4-wire
leased lines; automatic or manual dialing,
automatic or manual answer; and (336+
[MD1640A] only) automatic dial backup on
separate lines in leased line operation
Intelligent Features Fully “AT command” compatible, micropro-
cessor controlled remote configuration, EIA
extended Automode, adaptive line probing,
automatic symbol rate and carrier
frequency during start-up, retrain and rate
renegotiation, autodial, redial, repeat dial,
dial linking, pulse or tone dial, dial tone
detection, dial pauses, call status display,
auto-parity and data rate selection,
keyboard-controlled modem options,
nonvolatile memory and on-screen displays
for modem option parameters and up to
ten telephone numbers/command lines of
up to 60 digits each, help menus
Command Buffer 60 characters
Modulation Trellis Coded Modulation (TCM) at 33,600,
31,200, 28,800, 26,400, 24,000, 21,600,
19,200, 16,800, 14,400, 12,000 and 9600
bps, Quadrature Amplitude Modulation
(QAM) at 9600 (non-trellis), 4800 and 2400
bps, PSK at 1200 bps, FSK at 300 bps
Fax Modulations V.21CH2 FSK at 300 bps
V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps
V.17 TCM at 14400, 12000, 9600,
and 7200 bps