Motorola 326X V.34 User Manual page 115

326X Series Modem Troubleshooting Guide (Continued)
Problem Diagnosis/Test
Cannot hear connec- Check Speaker (ATM) option.
tion through the speaker
(stand-alone units)
Check Volume (ATL) option.
DATA MODE
The modem connects, Check that the modem is in data
but cannot pass data mode ("Data 9600", for exam-
ple, displays).
Check that the TD LED is lit on
modem's front panel (steady or
flashing) indicating that the
modem is receiving data from
the DTE.
Check the DTE rate of the local
modem.
Check the DTE's flow control
method.
If in normal mode, check for
modem-to-modem flow control.
Verify line quality:
Premature disconnect Ensure that the remote modem
supports error correction.
Check the disconnect reason
from the modem's front panel.
• Run a remote digital
loopback (RDL) or RDL
with pattern test.
• If you are still receiving
errors, disconnect the
modem from the line and
perform a local analog
loopback (LAL) or LAL
with pattern test (with
modem flow control off).
Possible Solution
If the speaker is not on, turn it on.
Adjust volume.
If the modem is not in data mode, establish a connection
with the remote modem.
• Check DTE for EIA signal requirements.
• Ensure the modem is correctly cabled to the DTE
(with a straight-through cable for your electrical
interface—V.35 or RS-232).
• Check that the correct communications port is being
used.
Ensure that the DTE rate matches the modem's terminal
rate setting.
• Ensure that the DTE's flow control is the same as the
modem's setting
(for example, XON-XOFF, RTS/CTS).
• If your communications software package's file
transfer protocol is used, and the package supports
RTS/CTS Flow control, set Flow=RTS/CTS
(AT * FL3). If the package does not support RTS/
CTS flow control, set Flow=Off (AT
Turn modem flow control off.
After running the RDL, if no errors occur, your line is
good.
If errors occur, perform a manual retrain, or retry the
phone call.
If the LAL or LAL with pattern test fails, contact Motor-
ola Customer Support.
If the LAL or LAL with pattern test passes, you may have
a line problem (contact your telephone company) or a
problem with your application (check with your software
vendor).
If the remote modem does not support error correction,
set the modem to normal mode and retry the call.
Based upon the disconnect reason, take the appropriate
action.
*
FL0).
Troubleshooting Guide 6-5