6-4 Troubleshooting Guide
Troubleshooting
Check the modem's line setting
(AT&L).
Ensure Line=Dial (AT&L0).
Check that the TR LED on
modem's front panel is steady
on.
If the TR LED is not steady on, ensure the DTE is
supplying DTR.
Check that the RI/OH LED is on
when ring is present on the line.
Check that the phone number you are calling is correct.
Check that the communications
package’s data rate is set to a
rate that the modem’s autobaud
feature supports.
Modem won't dial Ensure dial tone is present. Check phone line and ensure it is properly connected to
the modem’s rear panel.
If using DTR dial, check:
•Default dial option
(AT*DA)
Ensure default dial option is set to a location with a valid
phone number.
•Phone number at stored
location (presence of one)
•DTR option (AT&D) Ensure that DTR=108.1 (AT&D5) or Tail (AT&D4).
Ensure the DTE is supplying DTR.
Check that the communications
package’s data rate is set to a
rate that the modem’s autobaud
feature supports.
Unable to establish a
connection
Check the disconnect code from
the front panel or AT response.
Based on the disconnect reason, take the appropriate
action.
Check the modulation
configuration:
•Mod (AT*MM)
•Max Rate (AT*MX)
•Min Rate (AT*MN)
Ensure that Mod=C.Fast Auto or V32bis Auto.
Check EC/DC Mode (AT*SM)
option.
Ensure Mode=AutoRel (AT*SM3) on both the local and
remote modems.
Software package
displays on-line
connection status before
calling or answering is
performed
Ensure DCD=Normal (AT&C1). If DCD is not set to Normal, issue AT&C1 from the DTE
or set DCD=Normal from the front panel.
A call is established but
not maintained
Read the disconnect code. Based on the disconne ct reason, take the appropriate
action.
326X Series Modem Troubleshooting Guide (Continued)
Problem Diagnosis/Test Possible Solution