Does the LTE cellular interface support PPP

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The LTE cellular interface supports PPP. The following physical interfaces also support PPP:
- Synchronous or asynchronous serial interface working in synchronous mode (the interface type is the serial interface)
- Async interface working in protocol mode
- Serial interfaces formed by CE1/PRI or CT1/PRI interfaces, which have the same logical features as synchronous serial interfaces
- Serial interfaces formed by CE3 or CT3 interfaces, which have the same logical features as synchronous serial interfaces
- Serial interfaces formed by E1-F or T1-F interfaces, which have the same logical features as synchronous serial interfaces
- Serial interfaces formed by E1/T1 channels that are channelized from a CPOS interface, which have the same logical features as synchronous serial interfaces
- Cellular interfaces
- ISDN BRI interfaces
- POS interfaces

Note:
For LTE cellular interfaces, only the E392 data cards support the link-protocol ppp command.

Other related questions:
The LTE cellular interface on the AR is not Up
Huawei devices must use the LTE data cards of E392 and E8278. Otherwise, various configuration problems may occur. Because frequency planning varies from countries and different carriers have different authorized frequency bands, you need to confirm whether the frequency bands supported by carriers are consistent with those of the LTE data card when the LTE data card used by an enterprise meets requirements of LTE services.

Can 3G/LTE be restored after remove interface-cellular is executed
To ensure information security, an administrator can run the remove interface-cellular command in the diagnostic view to shield the cellular interface on the AR so that common users cannot use the 3G or LTE function for communication. The configuration takes effect only after the AR restarts using the reboot command. After the configuration takes effect, the 3G or LTE function on the AR is unavailable and cannot be restored. Exercise caution when you run the remove interface-cellular command. After the configuration takes effect, you cannot run the remove interface-cellular command; otherwise, the AR displays an error message.

Which versions support LTE
V2R5C00 and later versions support LTE. Starting from V2R5C00, the AR supports FDD-LTE. Starting from V2R6C10, the AR supports TD-LTE.

How do I query call session information on a 3G modem of an AR
Run the display cellular interface-number all command to check information about call sessions on the 3G modem.

Why does dialup often fail on a 3G cellular interface

The possible causes are as follows:

  • The 3G data card cannot be identified on the current network or is not supported on the AR.
  • The 3G data card does not match the current network. For example, authentication or service required on the current network is not enabled on the data card or USIM/SIM card. As a result, authentication or negotiation fails in dialup.
  • The 3G data card is not registered with available networks, due to weak signal strength or other reasons. Run the display cellular command to check information about 3G signals. The Current Service Status field must be displayed as "Service available", and the signal strength must be in the allowed range.
  • An incorrect connection mode is configured on the 3G data card. For example, the 3G data card has a SIM card installed but its connection mode is set to WCDMA-only.
  • The USIM/SIM card is not properly installed.
  • The 2G/3G services are not enabled on the USIM/SIM card.
  • The account balance of the USIM/SIM card is insufficient.
  • The USIM/SIM card works incorrectly. Run the display cellular command to check whether the USIM/SIM card is in correct state. The status of the USIM/SIM card must be Ok not Not insert.
  • Check whether 3G configurations, including the dialer number are correct. Check whether PPP authentication is required when the 3G cellular interface accesses a CDMA2000 network.
  • No profile is configured or a profile is incorrectly configured.
  • The 3G cellular interface is shut down using the shutdown command.

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