PPP
====================

You can find the PPP Settings at **Interfaces → Assign → PPP**.

.. image:: img/Interfaces-PPP.png
    :width: 100%
    :align: center
    :alt: PPP Configuration

PPP can only be configured on top of:

    * WWAN Physical Interfaces
    * Modem Serial Ports

PPP is commonly used for Cellular modem dial in connections.

There are three drop downs: **Country**, **Provider** and **Plan**.
Depending on the selection it will prefill several of the following fields with data.

**Username** is the PPP Username.

**Password** is the PPP Password.

**APN** is the Access Point Name.

**SIM PIN** can be configured if necessary.

**Dual SIM Card Support** if you have a VT AIR that has two physical SIM card slots, you can utilize the Daul SIM Option.
Only one SIM Card can be active at the same time but you can configure an automatic failover in case the **Gateway** of the connection is down.
In order for this to work, please configure a monitoring IP and disable the **Gateway** option *Always Up* :ref:`Gateway`.

.. image:: img/Interfaces-PPP2.png
    :width: 100%
    :align: center
    :alt: PPP Configuration Dual SIM

**Options** all options above are available again for the second SIM card.

**Auto Failover** enables the failover to the non active SIM card in case the Gateway of the connection goes down.

**Roaming** to allow the modem to use roaming.

LTE/5G
******

If you bought your VT AIR with *LTE* or *5G*, you can configure it with the following settings:

**HWInterface** wwan0 |br|
**Port** /dev/cdc-wdm0 |br|
**Data Port** /dev/cdc-wdm0

Add the dial in data of your provider and assign the PPP to an interface.

.. image:: img/PPP-Create.png
    :width: 100%
    :align: center
    :alt: LTE/5G PPP configuration

You can now configure your newly created interface for internet or as a backup connection.

We have a Video Tutorial regarding the LTE/5G configuration:

.. raw:: html

    <p>
    <iframe width="560" height="315" src="https://www.youtube.com/embed/FwapT8GKtaE" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
    </p>

LTE450
******

LTE 450 is a network that utilizes the 450MHz cellular band to provide robust, long-range connectivity with increased coverage and deeper signal penetration.
This frequency is now being used for LTE 450 networks as the industry transitions into the LTE and 5G era.
The 450MHz band is well-suited for IoT devices and critical applications, ranging from smart grid and smart meter services to public safety applications.
It supports CAT-M and narrowband-IoT (NB-IoT) technologies, making it ideal for large area coverage.
This has enabled cellular providers to offer blanket coverage cost-effectively.
The 450MHz band is used by 115 operators in 60 countries across the world.

If you bought your VT AIR with *LTE450*, you can configure it with the following settings:

**HWInterface** None |br|
**Port** '/dev/ttyCELLULAR' |br|
**Data Port** '/dev/ttyCELLULAR'

Add the dial in data of your provider and assign the PPP to an interface.