Operating instructions

TROUBLESHOOTING AND ONLINE HELP RESOURCES
105
PROBLEM DIAGNOSIS POSSIBLE SOLUTION
Your
communicatio
ns software is
reporting
many cyclic
redundancy
check (CRC)
errors and
low
characters per
second (CPS).
You may have a bad phone
line.
Optimum flow control
settings may not be enabled
on your modem.
The serial port rate in 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.
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.