ADSL fault analysis and treatment
ã€Introduction】
Everyone is using ADSL broadband Internet access now. While feeling the broadband, have you ever encountered the situation that you cannot access the Internet or the speed is very slow?
1. Slow Internet access speed (especially during peak night hours)
Cause Analysis
1. The user's lower wire is an iron core wire. There are too many line connectors, poor contact of the connectors, and serious oxidation of the connectors. It causes low line transmission quality and excessive signal attenuation, which affects the speed of Internet access;
2. The MODEM does not shut down for a long time, which makes the MODEM chip overheat. As a result, its performance can not be played normally, affecting the speed of Internet access, especially users of MODEM automatic dialing, may cause the MODEM to freeze and cannot access the Internet.
3. Poor contact between the device and the telephone line and network cable affects the user's Internet speed. Whether the interface between the telephone line and the voice separator is in good contact, and whether the interface between the MODEM and the Ethernet card of the user's computer is in good contact.
4. The failure of the user's computer operating system and the use of online software will also affect the user's Internet speed. Whether the network card of the user's computer is operating normally, whether the driver is installed correctly, whether the TCP / IP protocol is installed correctly; whether the user installs multiple firewalls, whether to set up a proxy server, whether to run online antivirus software, etc
5. There is a gap between the user's network requirements and the currently provided network bandwidth. At present, the theoretical bandwidth we provide to users is 640Kbps upstream and 1024Kbps downstream; its local download speed is more than 70Kbyte / s--120Kbyte / s (1byte = 8bps). As far as the current situation is concerned, we provide The speed can meet the user's local high-speed download, VOD on demand, online TV live broadcast, online radio, online MP3 playback, large-scale online games, video conferencing and other local network broadband access. However, for broadband services such as remote VOD on-demand, legendary and other large-scale games, online TV live broadcasts such as ESPN, video conferencing, etc., due to the limitations of remote transmission bandwidth, service provider's access bandwidth, and server processing capabilities, users may not be able to reach users The requested speed, or unable to connect. Users can pay attention to the dial-up software E300 or E500 to check the Rx bit rate, or use the telecom broadband network speed test to monitor their actual network speed.
Handling obstacles
According to the above reasons, gradually check the user's lines, connectors, MODEM hardware and settings, user computer hardware installation and software settings, and troubleshoot.
2. Frequent disconnection when surfing the Internet, and the telephone noise is loud
Cause Analysis
Check the connection of the telephone line, whether there is an extension or fax machine in front of the splitter. Is it normal to connect with a straight line? The correct wiring is as follows:
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Third, the modem is not online, causing users to be unable to access the Internet.
Description:
1. To determine whether the MODEM is online, you can observe the indicator status on the MEDEM, such as LINK, WAN, etc.
2. The inspection range of the subscriber line includes from MODEM → voice splitter. Pay attention to whether there is iron core wire in the subscriber line, whether there are too many connectors, whether the connectors are in good contact, check the insulation performance of the line to the ground, and whether the lower household line is too long.
Four, often dropped
1. Poor line quality, line aging, excessive distance from outside lines, too many connectors, and poor connector contact, resulting in excessive signal attenuation.
2. The MODEM does not shut down for a long time, causing the MODEM to overheat and affect its normal work.
3. There are too many telephone extensions in the user's home, and the voice separator is not installed correctly. If the user's phone is to be connected to an extension, the ADSL filter must be connected before the distribution box, that is, the external line is directly connected to the voice splitter.
5. MODEM goes online and cannot open the webpage
1. Check whether the connection between MODEM and computer is normal. IP address of PING MODEM. example:
Type in the MS-DOS state: ping 192.168.1.1 Ct If the following prompt indicates that the connection is normal, otherwise check the MODEM, network cable, network card.
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes = 32 TIme = 14ms TTL = 250
Reply from 192.168.1.1: bytes = 32 TIme = 27ms TTL = 250
Reply from 192.168.1.1: bytes = 32 TIme = 20ms TTL = 250
Check whether the PPPOE is normal. Auto dial users can enter the MODEM to observe their PPPOE status and observe whether they are assigned to IP addresses. Manual dial-up users type ipconfig in MS-DOS state to observe the relevant TCP / IP settings in the computer, including the IP address. Check whether the computer PPPOE dialing program is normal and whether it is assigned to an IP address
2. Check whether the network is connected. PING local router address. example:
In the MS-DOS state, type: ping 61.136.143.1 Ct If the following prompt indicates that the network is connected. If it doesn't work, check the computer's TCP / IP settings and online software usage.
Pinging 61.136.143.1 with 32 bytes of data:
Reply from 61.136.143.1: bytes = 32 time = 14ms TTL = 250
Reply from 61.136.143.1: bytes = 32 time = 27ms TTL = 250
Reply from 61.136.143.1: bytes = 32 time = 20ms TTL = 250
3. If the network is connected but the webpage cannot be opened, please check whether the user's computer is set with incorrect DNS. First PING or wait for the domain name to see if it is connected. If PING is possible, it may be that the IE browser of the user's computer or the system is malfunctioning. If you cannot ping, check the DNS settings of the user's computer. The correct DNS is: 202.103.6.46 and 202.103.0.117.
6. The user drops the line as soon as they call
1. The user voice separator is installed incorrectly. The voice splitter must be installed at the front of the user's splitter, and the telephone line connected to the modem must be dedicated.
2. There are multiple connections in the line. For example, multiple voices and signals are simultaneously connected on the same trunk, and more than one modem is installed on the same outside line.
3. The voice separator is malfunctioning.
7. In summary
When judging and handling ADSL faults, we should follow the method of line first, equipment first, hardware first, and software first, and then carefully check the MODEM-- → voice splitter from the user. For equipment failure, pay attention to the line connection method of the voice splitter and MODEM. The hardware part should pay attention to whether the network card is installed correctly, and the software should pay attention to the parameter setting of the MODEM, the installation and setting of the PPPOE dial-up program, the configuration of the TCP / IP protocol of the user's computer, and the online running program on the user's computer.
8. ADSL users watching the Three Gorges Hotline Video On Demand System (vod.sanxia.com.cn) frequently asked questions:
1. The user's identification of the movie appears multiple times and fails to pass:
a. Determine whether to enter the user name and password in the correct place on the correct page
b. Determine whether the entered user name and password are correct
c. Make sure that no one else uses the username at the same time
d. If the first three items are correct, the fault still exists, please wait 3 hours before watching
2. Buffers appear when users watch videos:
a. Make sure the memory size of the graphics card is above 16M
b. Make sure not to open many web pages and download
c. Determine whether the network speed can meet the bit rate of watching the movie
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