Examples of ADSL2 + common broadband network faults (1)

From the ADSL2 + broadband pilot to a large-scale trial, more than half a year has encountered various faults. Frequent disconnection, slow Internet access, failure to open webpages, and other faults. On the surface, ADSL2 + is only a broadband access technology that improves the download speed. In fact, there is a certain gap between ADSL2 + and the first-generation ADSL access technology, this makes troubleshooting of some ADSL2 + faults less handy. Below, I will write several typical troubleshooting processes of ADSL2 + to share with you.

I. ADSL2 + frequent online disconnection

Fault description: An ADSL2 + Broadband User uses the PPPoE virtual dial-up mode to access the Internet. Frequent disconnection occurs and there is no rule. After the disconnection, The PPPoE provided by the operating system can still automatically dial the Internet and be connected successfully.

Fault Analysis: Because the ADSL2 + users often encounter disconnection, it is initially determined that the user's line is faulty, so there is no noise in the user's phone line. After the physical telephone line of the user is changed, the disconnection has not been improved. It seems that the real cause of the fault is not the line quality. After the broadband maintenance personnel of telecom operators change the user to the first-generation ADSL mode, the phenomenon of bandwidth interruption disappears. Does the user's broadband Modem not support the ADSL2 + mode?

Broadband mode in broadband Modem

The user's bandwidth is restored to the ADSL2 + mode, and the disconnection failure is resumed. Enter the user's broadband Modem management address in the browser and suddenly find that the maximum afternoon rate of the ADSL2 + User is 24 Mbps, the crux of the problem is found. Because the distance between the ADSL2 + user and the DSLAM node has exceeded 3 miles, the user's ADSL line cannot withstand the downstream speed of 24 Mbps. The broadband maintenance staff of the telecom operator adjusted the afternoon rate of the ADSL2 + User to 12 Mbps, And the disconnection fault was eliminated.

Fault comments: ADSL bandwidth is disconnected. According to experience, this should be a line problem for users. However, the disconnection is not caused by the line. When handling the fault of ADSL2 + broadband, do not apply the Fault Cause of the first generation of ADSL. Otherwise, too many detours may occur during troubleshooting.

In addition to cut-off, ADSL2 + broadband disconnection is also a relatively difficult problem to deal with. below, the author will write down the causes of the ADSL2 + broadband fault, so that readers can take the right medicine.

1. Poor line quality: like the first-generation ADSL, poor line quality will also cause ADSL2 + broadband disconnection. Because ADSL2 + has high requirements on the line quality, if the user's line quality is poor, some users who upgrade from the first generation of ADSL to ADSL2 + may experience a disconnection fault. Do not think that you can access the Internet normally in ADSL mode. If the connection is dropped in ADSL2 + mode, the physical line will be okay.

2. bandwidth Modem mismatch: currently, the bandwidth Modem sold in the market does not support many ADSL2 + modes. Although both China Telecom and China Netcom are deploying ADSL2 +, ADSL2 + is not widely used. This makes it possible for the ADSL2 + broadband Modem to be mismatched with the local device, this will directly lead to broadband disconnection. In this case, you can directly replace a Modem that supports the ADSL2 + mode.

Working modes of broadband

3. Ungrounded computers: Computer grounding seems to be different from broadband Internet access, but it is only in the past. For ADSL2 + users, the computer is not grounded and may lead to frequent disconnection failures. The channel of ADSL2 + is doubled from that of the first generation of ADSL, which makes ADSL2 + very vulnerable and cannot withstand interference.