3Com 000839-08 Manual page 125

PROBLEM DIAGNOSIS
Your You may have a bad
communications phone line.
software is
Optimum flow control
reporting many
settings may not be
cyclic redundancy
enabled on your modem.
check (CRC) errors
and low characters
The serial port rate in
per second (CPS).
your communications
software may be set too
high for your modem's
UART or your area's
phone lines.
The remote site you are
dialing into may have
trouble with the file
transfer protocol.
There may be a
Terminate and Stay
Resident (TSR) program
(such as a screen saver or
virus scanner) running in
the background, disrupting
data communications.
120
T O
ROUBLESHOOTING AND
POSSIBLE SOLUTION
Try placing the call again. The phone company routes calls differently each
time.
In terminal mode, type AT&F1 and press ENTER to load the optimum
hardware flow control settings.
Lower the serial port rate in your communications software to 57,600 bps,
38,400 bps, or 19,200 bps. NOTE: The port rate for an x2 modem cannot
be set lower than 57,600.
Try using a different file transfer protocol. Do not use Xmodem if other
protocols are available. Zmodem is the preferred protocol.
Disable any Terminate and Stay Resident (TSR) programs running in the
background. If you have software running as a TSR, check the software's
manual for information about disabling its ability to operate as a TSR.
H R
NLINE ELP ESOURCES