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Why Cannot a 3G Dial-up Connection Be Established Immediately When the 3G Link Is Used as the Backup Link?
In most cases, 3G links are used as backup links of routers. When the primary link fails, the backup 3G link needs to immediately establish a dial-up network connection, which prevents the impact on services. However, sometimes when the primary links have a fault, the backup links fail to establish a dial-up connection immediately, and the establishment may even take several minutes.
The possible causes are as follows:
- The signal of the network provided by the carrier is poor.
- The automatic dial-up interval is too long.
Use the following check methods:
- Run the display cellular interface-number radio command to check the Current RSSI field and check received signal strength. If the RSSI is larger than or equal to -85 dBm, signals are stable and reliable.
- If the signal is normal and the 3G cellular interface uses automatic dial-up, run the display this command in the 3G cellular interface view to check the automatic dial-up interval. If the automatic dial-up interval is too long, run the dialer timer autodial command to shorten the interval so that the service interruption period can be reduced when 3G links are used as backup links.