Multitech Wireless EDGE User's Guide download pdf (Page 24)

Chapter 4 – Troubleshooting & Frequently Asked Questions

Multi-Tech Systems, Inc. MultiModem EDGE Wireless Modem User Guide 24

Chapter 4 – Troubleshooting and

Frequently Asked Questions

Troubleshooting Examples

Before calling the Multi-Tech Technical Support, check to the following connections:

• The right antenna is connected to the modem

• The serial cable connection is correct

• The power is connected correctly and the power lights on the modem are on

• Verify your signal strength

• Verify your network registration

• Use the following situation examples to troubleshoot the modem not answering and the modem

returning a No Carrier message.

Situation A: The modem does not answer

If the Wireless MultiModem does not answer through the serial link upon an attempted transmission of data or

voice signals, see the table below for possible causes and solutions.

Solutions for ‘no connection through serial link’ situation

If the

modem

returns …

Then ask … Action

(nothing) Is the communication program

properly configured?

In communications program, verify that modem

parameters have been set to the values shown here:

Data bits = 8

Parity = none

Stop Bits = 1

Baud = 115200 bps

Is another program interfering

with the communication

program?

Close any such application program.

Is the modem set to

autoanswer?

Type ATS0=1 (to set to auto answer on the first ring)

Type ATA (to set to manual answer)

Is the communication program

receiving RING responses?

Type ATS0=1 (to set to auto answer on the first ring)

Type ATA (to set to manual answer)

Situation B: The modem always returns «No carrier» when trying to originate a call

Solutions for “no carrier” message

If the modem

returns …

Then ask … Action

no carrier

(esp. for data

communication)

Is the selected bearer type

supported by the called

party?

Is the selected bearer type

supported by the network?

Type AT+CEER to view the extended error code (see

“Error Results Codes" in the AT Command guide).

Be sure that the selected bearer type is supported by the

called party.

Be sure that the selected bearer type is supported by the

network.

If no success, try bearer selection type: AT+CBST=0,0,3

Be sure SIM card is available for data/fax calls.

no carrier

(esp. for voice

communication)

Be sure that the semicolon character (“;”) is typed

immediately after the phone number in the AT command;

e.g., ATD######;

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