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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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How Do I Locate the Cause of an LTE Dial-up Access Failure?

How Do I Locate the Cause of an LTE Dial-up Access Failure?

Run the display cellular interface-number network command to check the Current Service Status field.

If the Current Service Status field displays Service Available, the LTE service is available. Perform the following operations to further check the router configuration:

  1. Check whether the dialer number is configured correctly.
  2. Check whether the APN is configured correctly
  3. Check whether the authentication mode, user name, and password are consistent with those provided by the carrier.
  4. Check whether the dialer ACL is configured correctly.

If the Current Service Status field displays No service or Emergency, the LTE service is unavailable. If the LTE service is unavailable, perform the following operations:

  1. Run the display cellular interface-number network command to check the Current Network Connection field and check whether the type of the network connected to the LTE modem is correct.

    LTE cellular interfaces can be connected to the LTE network only when the LTE network connection mode configured for the LTE modem is consistent with the type of the LTE network provided by the carrier. If the network connection mode is inconsistent with the network type, run the mode lte command to modify the LTE network connection mode for the LTE modem to be consistent with the type of the LTE network provided by the carrier.

  2. Run the display cellular interface-number radio command to check the Current RSRP field and received signal strength. If the RSRP is greater than or equal to -112 dBm, signals are stable and reliable.
    • If the Current RSRP field displays a value smaller than -112 dBm, perform the following operations:

      1. Check whether the angle of the antennas is proper. The angle of antennas affects signal receiving and sending.
      2. Check whether the LTE/2G signal in the area is strong.
    • If the Current RSRP field displays Unknown, perform the following operations:

      1. Check whether the LTE hardware or LTE antenna is damaged, not properly installed, or not fastened.
      2. Check whether the area is covered with LTE/2G signals.
  3. Check the SIM, USIM, or UIM card.
    1. Contact the carrier to confirm whether LTE/2G services are enabled on the SIM, USIM, or UIM card and whether the users owe fees.
    2. Run the display cellular interface-number radio command to check the SIM Status field and check whether the SIM, USIM, or UIM card status is normal.

      If the SIM Status field displays Not insert, the SIM, USIM, or UIM card is not installed properly.

  4. Run the display cellular interface-number radio command to check PIN Status and check whether the PIN status is normal.
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Updated: 2019-05-10

Document ID: EDOC1000079719

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