Situation C: The Modem Always Returns "No Carrier" When Trying To Issue A Communication - Multi-Tech MultiModem MTCBA-C 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 communi-
cation)
If the modem
returns
no carrier
(esp. for voice
communi-cation)
Solutions for "no carrier" message
Then ask ...
Is the selected Type AT+CEER to view the extended error
bearer type code (see "Interpretation of Extended Error
supported by the Codes" table, page 20).
called party?
Be sure that the selected bearer type is
Is the selected supported by the called party.
bearer type
Be sure that the selected bearer type is
supported by the
supported by the network.
network?
If no success, try bearer selection type:
AT+CBST=0,0,3
Then ask ... Action
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
Is the received See "Signal Strength Verification".
signal strong
enough?
Is the antenna
See "Antenna/RF Specifications".
properly
connected?
21
Chapter 3 - Troubleshooting
Action