On a GSM network, large downstream traffic bursts cause errors in 3G data card encryption and decryption, and services are interrupted. How can I solve this problem

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To solve this problem, configure configure an NQA test instance to detect the 3G link status.



  1. Run the interface cellular interface-number command to enter the 3G cellular interface view.
  2. Run the modem auto-recovery track nqa admin-name test-name [ probe-cycle period ] command to configure the device to use an NQA test instance to detect the 3G link status.
  3. Run the modem auto-recovery track action modem-reboot fail-times times command to set the maximum number of 3G link detection failures in an NQA test instance. When the number of consecutive 3G link detection failures in an NQA test instance reaches the maximum value, the device restarts the 3G data card.

Other related questions:
Which 3G models are supported by the AR
The hardware that supports 3G includes the 3G data card, 3G card, and 3G model. The AR equipped with a 3G data card or 3G card provides 3G interfaces. The 3G model is equipped with 3G interfaces. The 3G model refers to the AR with a 3G antenna interface. The 3G interface can be configured on the 3G model with no 3G data card or 3G card inserted. The 3G models in compliance with the WCDMA standard include the AR151G-HSPA+7, AR157G-HSPA+7, and AR207G-HSPA+7. The 3G model in compliance with the CDMA2000 standard includes the AR151G-C.

L2TP services are interrupted because frequent 3G network disconnection
The reason is that 3G signals in the area where the device is located are poor, causing frequent 3G network disconnection. After the 3G disconnection, Hello packets expire. Consequently, the connection fails. To address this issue, perform the following operations: 1. Configure track nqa. Restart the 3G module after the ping operation fails. 2. Change the interval for transmitting L2TP Hello packet to 120s.

How do I identify the 3G data card indicator
For a WCDMA data card: -If the indicator blinks green twice at short intervals, the data card has not registered with the network. -If the indicator blinks blue once every 2s (0.5 Hz), the data card has registered with the network. -If the indicator is steady blue, dialup succeeds but the data card is not transmitting data services. -If the indicator is steady light blue, dialup succeeds and the data card is transmitting data services. For a CDMA2000 data card: -If the indicator blinks blue once every 2s (0.5 Hz), the data card has not registered with the network. -If the indicator blinks blue twice at short intervals, the data card has registered with the network. -If the indicator blinks blue once every 0.25s (4 Hz), dialup succeeds and the data card is transmitting data services.

What data cards are required to connect to 3G networks
HD terminals can connect to 3G networks through the following Huawei 3G data cards: WCDMA: E270, E220, E216, E170, E226, E161, and E182E CDMA2000: EC226, EC228, EC122, EC1260, and EC169 NOTE: HD terminals do not support TD-SCDMA data cards.

What can I do if my search for 3G networks fails
The endpoint was outside the 3G network area, or the network signal strength was too weak. Move the endpoint to an area with strong 3G network signals.

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