3Com 56K manual Additional, This feature Supports, Word Length Parity 1 Bit Stop Bits

Technical Specifications E-3

Additional
Specifications
	This feature	Supports
	Supported serial port	230400, 115200, 57600, 38400, 19200, 9600, 4800,
	rates	2400, 1200, and 300 bps
	Adaptive Speed	21600, 19200, 16800, 14400, 12000, 9600, 7200, and
	Leveling (ASL)	4800 bps
	Serial port connector	DB-25
	Communications	Full- or half- duplex on 2-wire phone lines; demand-driven
	channel	high-speed turnaround in HST mode; symmetrical speeds in
		V.32 bis.
	Data format	Binary, serial; defaults to 8-bit word length, no parity, and
		1 stop bit.
		Word Length	Parity (1 Bit)	Stop Bits
		7	Even, odd, mark, space	1
		7	None	2
		8	None	1
	Flow Control Buffers	Variable sizes
	Command Buffer	56 characters, excluding the AT prefix, Carriage Return,
		and spaces
	Test Options	Remote digital loopback, digital loopback, test pattern, and
		dial test
	Failed Call Timeout	60 second default, programmable 2-255 sec.
	Answer Tone Timeout	60 seconds
	Answer Tone Detector	2080-2120 Hz
	Loss of Carrier	0.7 second default, programmable 0.2-25.5 sec.
	(Disconnect Timer)
	Equalization	Adaptive
	Receive Sensitivity	- 43 dBm + 2 dBm
	Transmit Level	- 9 dBm maximum
	Transmitter Frequency	.01%
	Tolerance
	Certification	FCC Part 68 Part 15, Class B Domestic; IC (Canada) CS-03,
		UL listed
	Ringer equivalence	0.4b

Serial Ports Most computers provide a DB-25 or DB-9 port that conforms to the EIA-232 standard. If you are connecting your Business Modem to a Macintosh computer, see the section For Macintosh Computers.