even if the modem loses power. Now that the modem is properly configured, you may attempt
activate the modem as described in section 4.0 and the
Appendix
.
7 Frequently Asked Questions
Below are some of the most
Frequently Asked Questions
. The answers contained herein may
address many of the questions you could have about our product.
7.1 Does The Modem Understand AT Commands?
Yes. For information on AT commands, see the
"AT Command Reference"
section 10.0.
7.2 At What Speed Can I Send Data?
Data rates for Circuit Switch Data calls are up to 14.4 kbps, whereas 1xRTT Packet Data Calls
(TCP/IP) supports rates up to 153.6 kbps.
7.3 How Do I Perform An Over-the-Air Activation Of The Unit?
Access the modem via a terminal emulation package such as a PC running HyperTerminal©.
Once connected to the modem, please use the instructions for OTAPA in the Appendix that are
specific to your carrier.
7.4 The CDM-819s Does Not Answer When I Dial From Another
Modem.
The CDM-819s can be configured to automatically answer incoming calls, but by default is set
not to do so. To set up the modem for auto-answer, issue the command:
ATS0=1
7.5 The Modem Auto-Answered, But Is Not Connecting.
The modem is not set up on initialization for permanent termination on asynchronous calls. Enter
the following command to check this:
AT$QCVAD?
The value returned should be 4. If not,
enter the following command:
AT$QCVAD=4
7.6 I Dialed a Phone Number Using ATDT and received "No
Carrier".
Verify that your CDMA provider has an IWF device installed on their network. If so, check if the
account settings for the modem number are provisioned to activate the IWF for circuit switched
data. The modem may not have the correct Preferred Roaming List (PRL) loaded. Performing
Over-the-Air Service Provisioning (OTASP) should automatically load the correct PRL into the
modem. For information on how to initiate the OTASP, please refer to the
"How Do I Perform An
Over-the-Air Activation Of The Unit?"
section 7.3 of the FAQ above.
Verify with your CDMA carrier if the phone number of the modem is activated in their network.
You can dial the phone number of the modem from a voice line. If the modem's phone number is
not activated, the cellular provider should reply with a message informing you of this.
7.7 I Dialed A Phone Number Using ATDT And Connected, But
When I Physically Move The Modem, I Receive A "No
Carrier" Message.
The modem's immediate location may have strong Electromagnetic Interference (EMI). Verify
the signal strength by issuing the command:
AT+CSQ?
The signal strength is displayed as
+CSQ:XX,YY
. Where the XX is the signal strength and the YY indicates the error rate, a value
of 99 is indeterminate. The signal strength varies from 0 to a maximum of 31.
Confirm and that you are registered on the cellular network.
AT+CSS?
A reply of
+CSS?
2,Z,99999
indicates that you are not registered. It may take up to 15 seconds or so after power-up
to register on the network. Once registered a typical response will be
+CSS?:
1,A,4152
where 1
