Situation C: The Modem Always Returns «No Carrier» When Trying To Issue A Communication - Multitech MultiModem MTCBA-G-F1 User Manual

Situation C: The modem always returns «No carrier» when trying to
issue a communication
If the modem returns ...
no carrier
(esp. for data communication)
no carrier
(esp. for voice communication)
Multi-Tech Systems, Inc. MultiModem® GPRS User Guide
Solutions for "no carrier" message
Then ask ...
Is the selected
bearer type
supported by the
called party?
Is the selected
bearer type
supported by the
network?
Is the received
signal strong
enough?
Is the antenna
properly
connected?
Chapter 3 – Troubleshooting
Action
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.
Be sure that the semicolon character
(";") is typed immediately after the
phone number in the AT command.
E.g., ATD######; type
AT+CBST=0,0,3
Configure the SIM card for data/fax
calls.
See "Signal Strength Verification."
See "Antenna/RF Specifications."
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