Changes

==Finding the modem manufacturer==

==Finding the modem manufacturer==

In your [[RUTX_Routers]] WebUI, go to '''Status → System''' page. Under the '''Modem''' section, you'll see the '''Model''' row.

In your device WebUI, go to '''Status → System''' page. Under the '''Modem''' section, you'll see the '''Model''' row.

[[File:Networking_Quectel_configuration_locking_cellids_on_devices_with_quectel_modems_modem_model_v3.PNG|border|class=tlt-border]]<br>

[[File:Networking_Quectel_configuration_locking_cellids_on_devices_with_quectel_modems_modem_model_v3.PNG|border|class=tlt-border]]<br>

If the model starts with '''EG, RG, EC''', and '''not SLM or RG (5G not supported yet)''', this feature should work. However to make sure it's supported, command '''''gsmctl -A 'AT+QNWLOCK=?'''''' should not return '''ERROR''', when ran via [[Command_Line_Interfaces_RutOS#SSH|SSH]] or [[Command_Line_Interfaces_RutOS#CLI_.28WebUI.29|CLI]]. The response should look something like this:<br>

If the model starts with '''EG, RG, EC''', and '''not SLM or RG (5G not supported yet)''', this feature should work. However to make sure it's supported, command '''''gsmctl -A 'AT+QNWLOCK=?'''''' should '''not''' return '''ERROR''', when ran via [[Command_Line_Interfaces_RutOS#SSH|SSH]] or [[Command_Line_Interfaces_RutOS#CLI_.28WebUI.29|CLI]]. The response should look something like this:<br>

[[File:Networking_Quectel_configuration_locking_cellids_on_devices_with_quectel_modems_checking_compatibility_v2.PNG|border|class=tlt-border]]

[[File:Networking_Quectel_configuration_locking_cellids_on_devices_with_quectel_modems_checking_compatibility_v2.PNG|border|class=tlt-border]]

'''A few notes before we get started:'''

'''A few notes before we get started:'''

* The described method works with Teltonika RUT/RUTX/TCR/TRB series devices, that contain Quectel modems;

* The described method works with Teltonika RUT/RUTX/TCR/TRB series devices, that contain '''Quectel''' modems;

* Using this command will lock the device into LTE-only mode;

* Using this command will lock the device into '''LTE-only mode''';

* Rebooting the device might remove the cell lock;

* Rebooting the device ''might'' remove the cell lock;

* '''It is not recommended to perform these actions while the device is connected remotely as if it loses connection, it will not be recoverable!'''

* '''It is not recommended to perform these actions while the device is connected remotely as if it loses connection, it will not be recoverable!'''

<br>

<br>

Where:

Where:<br>

3 - ''LTE only mode;''

*'''3''' - ''LTE-only mode;''<br>

1 - ''Take effect immediately after executing the command.''

*'''1''' - ''Take effect immediately after executing the command.''<br>

This may cause the router to lose connection for a few seconds, so before continuing to the next step, please make sure the router is connected to the network.

This may cause the router to lose connection for a few seconds, so before continuing to the next step, please make sure the router is connected to the network.

* '''139B15''' - currently serving cell ID in hexadecimal form. This ID is unique to each cell. It is only used as a reference point in this configuration.<br>

* '''139B15''' - currently serving cell ID in hexadecimal form. This ID is unique to each cell. It is only used as a reference point in this configuration.<br>

* '''459''' - PCI or Physical Cell Identity. PCI is necessary for a modem to communicate with a cell tower. This is one of the variables we will use when setting up cell locking.<br>

* '''459''' - PCI or Physical Cell Identity. PCI is necessary for a modem to communicate with a cell tower. This is one of the variables we will use when setting up cell locking.<br>

* '''1850''' - LTE EARFCN stands for E-UTRA Absolute Radio Frequency Channel Number. EARFCN is used to determine the channel frequency, but it will not be important to us in this configuration. This will be the second variable when setting up cell locking.<br>

* '''1850''' - LTE EARFCN stands for E-UTRA Absolute Radio Frequency Channel Number. This will be the second variable when setting up cell locking.<br>

===Finding the neighbouring cells details===

===Finding the neighbouring cells details===

Here's an explanation of the first line for each value:<br>

Here's an explanation of the first line for each value:<br>

* '''LTE''' - network generation;

* '''LTE''' - network generation;

* '''1850''' - EARFCN value;

* '''1850''' - EARFCN value. EARFCN is used to determine the channel frequency and bandwidth, thus it can be useful to determine the band of neighbouring cell. This can be achieved using [https://5g-tools.com/4g-lte-earfcn-calculator/|| EARFCN calculator];

* '''459''' - PCI;

* '''459''' - PCI;

* '''-6''' - RSRQ (dB);

* '''-6''' - RSRQ (dB);