If a mobile connection is required, the GSM connection process runs through several stages as briefly described below. If it fails in one of the stages it will restart the process from one of the earlier stages.
Note that the decoder will try to connect to a max. of 20 APNs. If manual APN settings are configured, the manual APN will be tried first. If AUTO APN settings are selected and a connection was already successfully established, the last known successful APN settings (for that SIM/SIM network) will be tried first.
| State as displayed | Meaning | Possible cause of failure |
|---|---|---|
| START | Connection process is starting. | |
| IGNITE | Modem is started. | |
| PORT-SETUP1 | Decoder-modem-communication setup. | |
| MODEM-WAIT | Wait until modem is ready. | |
| PORT-SETUP2 | Decoder-modem-communication setup. | |
| MODEM-TYPE | Detect modem type. | |
| SIM-CHECK | Check for SIM. | No SIM inserted/SIM not readable |
| SIM-INFO1 | Get SIM ID. | |
| PIN-CHECK | Check if a PIN is required. | |
| ENTER-PIN | Enter PIN if required. | Less than 2 PIN tries left. |
| SIM-INFO2 | Get provider information from SIM. | |
| WAIT-READY | Wait until modem is ready. | |
| GET-RSSI | Get signal quality. | |
| SEARCH-NET | Searching for networks. | No network available. |
| APN-LIST | Build list of APNs to use/try. | |
| REGISTER | Register for data communication. | No network available. |
| SET-APN | Set one of the APN settings. | |
| DIAL-UP | Establish data connection. | Invalid APN settings tried/SIM not activated/No low level data transmission possible due to bad reception/Provider issues |
| VERIFY | Verify that data can be transmitted and received. | Invalid APN settings tried/SIM not activated/No data transmission possible due to bad reception/Provider issues |
| CONNECTED | Connection is established. |