Additional Specifications; Serial Ports - 3Com 56K Command Reference Manual

Additional
Specifications
This feature
Supported serial port
rates
Adaptive Speed
Leveling (ASL)
Serial port connector
Communications
channel
Data format
Flow Control Buffers
Command Buffer
Test Options
Failed Call Timeout
Answer Tone Timeout
Answer Tone Detector 2080-2120 Hz
Loss of Carrier
(Disconnect Timer)
Equalization
Receive Sensitivity
Transmit Level
Transmitter Frequency
Tolerance
Certification
Ringer equivalence

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.
Supports
230400, 115200, 57600, 38400, 19200, 9600, 4800,
2400, 1200, and 300 bps
21600, 19200, 16800, 14400, 12000, 9600, 7200, and
4800 bps
DB-25
Full- or half- duplex on 2-wire phone lines; demand-driven
high-speed turnaround in HST mode; symmetrical speeds in
V.32 bis.
Binary, serial; defaults to 8-bit word length, no parity, and
1 stop bit.
Word Length Parity (1 Bit)
7 Even, odd, mark, space
7 None
8 None
Variable sizes
56 characters, excluding the AT prefix, Carriage Return,
and spaces
Remote digital loopback, digital loopback, test pattern, and
dial test
60 second default, programmable 2-255 sec.
60 seconds
0.7 second default, programmable 0.2-25.5 sec.
Adaptive
- 43 dBm + 2 dBm
- 9 dBm maximum
.01%
FCC Part 68 Part 15, Class B Domestic; IC (Canada) CS-03,
UL listed
0.4b
Technical Specifications
Stop Bits
1
2
1
E-3