Robustel M1000 UP User Guide Instrukcja Użytkownika Pobierz pdf (Strona 38)

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4.2.2 The modem keep rebooting all the time:

 Please make sure you have inserted the SIM card.

4.2.3 Receiving “No Carrier” Message

If the modem returns a “No Carrier” message upon an attempted call (voice or data), then refer to the table below

for possible causes and solutions.

If the modem returns…

Then ask…

Action…

“No Carrier”

Is the received signal strong enough?

Use “AT+CSQ” to check RSSI, please check

Signal Strength Indication.

Is the antenna properly connected?

Refer to section 2.5

“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. ATD123456;

“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 no success, try bearer select type by AT

command: AT+CBST=0,0,3

Signal Strength Indication

Value of received signal strength indication (RSSI)

Interpretation of the received signal strength

0 to 12

Insufficient or weak

13 to 19

Average

20 to 31

Good

No signal

4.3 Terms and Abbreviations

Abbreviations

Description

Alternating Current

APN

Access Point Name of GPRS Service Provider Network

Conformité Européene (European Conformity)

CHAP

Challenge Handshake Authentication Protocol

CSD

Circuit Switched Data

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