Motorola and V.32bis, V.34-SDC, 326X V.34 manual Max Rate AT*MX Min Rate AT*MN

326X Series Modem Troubleshooting Guide (Continued)

Problem	Diagnosis/Test	Possible Solution
	Check the modem’s line setting	Ensure Line=Dial (AT&L0).
	(AT&L).
	Check that the TR LED on	If the TR LED is not steady on, ensure the DTE is supply-
	modem’s front panel is steady	ing DTR.
	on.
	Check that the RI/OH LED is on	Check that the phone number you are calling is correct.
	when ring is present on the line.
	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:

Troubleshooting

•Default dial option (AT*DA)

•Phone number at stored location (presence of one)

•DTR option (AT&D)

Check that the communications package’s data rate is set to a rate that the modem’s autobaud feature supports.

Ensure default dial option is set to a location with a valid phone number.

Ensure that DTR=108.1 (AT&D5) or Tail (AT&D4).

Ensure the DTE is supplying DTR.

Unable to establish a	Check the disconnect code from	Based on the disconnect reason, take the appropriate
connection	the front panel or AT response.	action.
	Check the modulation
	configuration:
	• Mod (AT*MM)	Ensure that Mod=C.Fast Auto or V32bis Auto.
	• Max Rate (AT*MX)
	• Min Rate (AT*MN)	Ensure Mode=AutoRel (AT*SM3) on both the local and
	Check EC/DC Mode (AT*SM)
	option.	remote modems.
Software package dis-	Ensure DCD=Normal (AT&C1).	If DCD is not set to Normal, issue AT&C1 from the DTE
plays on-line connection		or set DCD=Normal from the front panel.
status before calling or
answering is performed
A call is established but	Read the disconnect code.	Based on the disconnect reason, take the appropriate
not maintained		action.

6-4 Troubleshooting Guide