41110590
Rev 6.1
January 28, 2019
39
Product Technical Specification and
User Guide
Troubleshooting the GL7x00
When the verbose error report method is enabled, the response of the GL7x00 in case of error is
either:
•
+CME ERROR: <error result code>
or
•
+CMS ERROR: <error result code>
For more information on error result code description and further details on the
AT+CMEE
command
that are applicable to the GL7500, please refer to document [3] AirPrime HL7588 AT Commands
Interface Guide; for error result code description and further details on the
AT+CMEE
command that
are applicable to the GL7600, refer to the commands marked as supported by HL7692 in document
[4] AirPrime HL76xx AT Commands Interface Guide.
Tip:
It is strongly recommended to always enable the verbose error report method to get the Mobile
Equipment error code (enter the
AT+CMEE=1
command).
6.4.
Receiving a “NO CARRIER” Message
If the GL7x00 returns a
"NO CARRIER"
message upon an attempted call (voice or data), refer to the
table below for possible causes and their corresponding solutions.
Table 24.
Solutions for Receiving a “NO CARRIER” Message
If the GL7x00
returns
Then ask
Action
“NO CARRIER”
Is the received signal strong
enough?
Refer to section 4.3 Verify the Received Signal
Strength to verify the strength of the received
signal.
Is the GL7x00 registered on the
network?
Refer to section 4.4 Verify the Network
Registration to verify the network registration.
Is the antenna properly connected?
Refer to section 2.2.3.2 Antenna Specifications
for antenna requirements.
"NO CARRIER" (when
trying to issue a voice
communication)
Is the semicolon (;) entered
immediately after the phone number
in the AT command?
Ensure that the semicolon (;) is entered
immediately after the phone number in the AT
command.
e.g.
ATD######;
"NO CARRIER" (when
trying to issue a data
communication)
Is the SIM card configured for
data/fax calls?
Configure the SIM card for data/fax calls. (Ask
your network provider if necessary).
Is the selected bearer type
supported by the called party?
Ensure that the selected bearer type is
supported by the called party.
Is the selected bearer type
supported by the network?
Ensure that the selected bearer type is
supported by the network.
If still unsuccessful, try selecting the bearer type
using the AT command:
AT+CBST=0,0,3
If the GL7x00 returns a
"NO CARRIER"
message, you may retrieve the extended error code by using
the AT command
AT+CEER
. Refer to the table below for the interpretation of extended error codes.
