Black Box MD1640A, MD1641A Mode of Operation, Intelligent Features, Command Buffer, Modulation

	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

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