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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Why Is the 3G Link Frequently Disconnected When the 3G Cellular Interface Is Used for Network Access?

Why Is the 3G Link Frequently Disconnected When the 3G Cellular Interface Is Used for Network Access?

An enterprise branch uses a router as the egress gateway and connects to a network through 3G cellular interfaces. The NMS of the headquarters detects that the 3G link of the branch is frequently disconnected.

The possible causes are as follows:

  1. The signal of the network provided by the carrier is unstable.
  2. The 3G hardware is faulty.
  3. The configuration is incorrect.

Use the following check methods:

  1. Run the display cellular interface-number radio command to check the Current RSSI field and received signal strength. If the RSSI is larger than or equal to -85 dBm, signals are stable and reliable.
  2. Check whether the 3G data card or 3G interface card and SIM, USIM, or UIM card are damaged or not properly installed.
  3. Run the display dialer interface cellular interface-number command to check the Idle field and check whether the maximum idle time of the 3G link is manually shortened.

    If a branch connects to a network through a 3G cellular interface and requires a long online duration, on-demand dial-up is not necessary for the branch. If on-demand dial-up is configured to reduce data traffic, run the dialer timer idle seconds command to set the link idle time of a 3G link to 600 seconds or longer.

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Updated: 2019-03-06

Document ID: EDOC1100069331

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