Had to use small "cat" walk in the vastness of the "'net' foreign," Thinking about it now makes one miserly, it is because a variety of network connection, such as the emergence of springing up to provide you a fast and stable network access services, ADSL broadband access is one of a beautiful landscape. Today I come to ADSL broadband, and we discuss about the optimization, troubleshooting knowledge, and take a look at some of its typical application related.
I. Determination of network speed
ADSL lines using traditional phone lines, its main characteristic is faster speeds and low cost. "Internet speed" is a generic description of all the network speed of a term, in fact, the place about the "connection speed" should include two aspects, one is the uplink speed, the other is downstream speed, upstream speed refers to the Internet from the local upload the speed of downlink speed refers to our download speed. In addition, the upload and download of the destination server is different upstream and downstream speeds are not quite the same speed, in short, we usually speak of the "Internet speed" is a general theory of value.
1. Bandwidth of the factors affecting the actual speed
ADSL does not require setting up a private network and due to have a strong advantage of today's most widespread use of copper as the transmission medium of telephone and in a pair of copper twisted pair (telephone line) get three information channels: one for standard telephone service channel, a rate of 640kbps ~ 1Mbps medium-speed upstream channel, a rate of 1Mbps ~ 8Mbps high-speed downlink channel, and these three channels can work simultaneously. DMT modulation and demodulation techniques in a pair of copper telephone line 0 ~ 4kHz frequency band used to transmit telephone audio, 26kHz ~ 1.1MHz frequency used to transmit data, and put it to the width of 4kHz is divided into 25 sub-channels and 249 upstream downstream sub-channels. After the input data bits into bits and cache sub-block, and then modulated by the TCM coded QAMM sent to sub-channel, in theory, can transfer 15bits of data per Hertz, so the theory ADSL line speed of 25 × 4 × 15 = 1.5Mbps, The theoretical downlink speed of 249 × 415 = 14.9Mbps, due to line quality and transmission distance and other factors, the actual connection speed is difficult to achieve the desired value. Here I teach you several ways to complete measure out their own network speed:
2. Software Testing
DU Meter
Software Version: 3.05
Software Size: 1065 KB
Software Type: Shareware
Application Platform: Windows 9x/2000/XP
Download and install the software after the system is running, the system tray will have a triangle and the next by a triangle formed on the program icon, when the network has upload or download data package, this icon is green, if the current network, no data packet transmission, this icon will show red. Click the will open the window shown in Figure 1.
Figure 1 DU Meter speeds show
Figure 1 in the "DL" refers to the "Download" that is down the speed, "UL" means the "Upload" ie uplink speed.
Since DU Meter is based on current network traffic to analyze, the downstream speed, so the test network speed should be to create a test environment before: download or upload large files, suggest that you also download software to download to use several 4 to 5 large-scale software, so as to fill the bandwidth, also download the software for uploading abnormal features, it is recommended you download the software more to download with a metamorphosis, so the test is more effective.
Tip: you can also use the Bandwidth Meter 2001 to test the network speed.
3. Website Testing
Speeds to test domestic related sites
Typing in the browser address bar http://www.linkwan.com/gb/broadmeter/SpeedAuto/ (World Networks Test Site), including various test points, will open the page, click on a test point (for example, "Beijing "), the page will start the appropriate testing procedures, such as testing is completed, we will get a bar graph shows the test results, shown in Figure 2.
Figure 2 Web results
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Related sites abroad speeds test
http://www.numion.com/ is a very good web site, the site, we can by clicking the "YOURSPEED" link to test the speed of the network of individual countries, while site also provides the network per unit time speed test capabilities to test the following speeds in different countries tell us to use an example.
Click the "YOURSPEED" link in the page that opens, select an end state, then click "Start" button, then open the page in the countries listed in the selection of the site, select a site to start the test, test completion Then we will see the test results shown in Figure 3 pages.
Figure 3 numion site test results
Tips: Generally, the provisions of ADSL speeds are as follows: up speed "640kbps ~ 1Mbps", downlink speed "1Mbps ~ 8Mbps", now generally assigned to an individual user's bandwidth is 512kbps, under normal circumstances, normal ADSL user downlink speed can reach 60KB / s or so.
In the above mentioned units we have two, one is "bps", the other is "B / s", former "bite per secend" (bits per second) of the abbreviation, the latter is "Byte / secend" (bytes per second) of the abbreviation, the "bite" (bit) and "Byte" (bytes) of the conversion relationships 1Byte = 8bite, so the above-mentioned downlink speed "60KB / s" is equivalent to 60 × 8 = 480kbps.
Second, ADSL optimization
ADSL speed is affected by many factors, so how can we create these effects and to minimize the loss of it? Here we talk about ADSL optimization knowledge. ADSL hardware, software optimization can be divided into the optimization, and optimization of hardware, including line, hardware, the surrounding environment, the software will have to take into account the dial-up software and systems.
1. Hardware optimization
(1) ADSL alignment of the proposed
ADSL is a technology based on twisted pair, twisted pair is two insulated copper wires wrapped around each other with some regularity and together, this can effectively resist the external electromagnetic interference. If households parallel lines over 20 meters, then, should replace the first twisted pair of parallel lines, preferably brand Category 5. When the exchange line to note the strength of twisted pair is very weak, we must try to be fixed, and can not have loose, otherwise, will greatly affect the speed ADSL.
In addition, because ADSL is the voice of ordinary telephone lines superimposed on high-frequency low-frequency digital signal, so in order to ensure the normal data transmission, the filter will not connect the phone before, call security and other devices. Although theoretically ADSL telephone line connection will not have any impact on connection speed, in fact, connected to standard equipment, the speed still slow. If conditions permit, it is best to install an ADSL line, this can avoid many problems. But also in the interior wiring issues, and power lines must be careful not to run line level. Power cord to the telephone line has a very strong interference. We have modified line, the best single pull.
(2) Select-performance network card
Card as a very important network equipment, all network data is sent or received by it to, so cards performance is good or bad impact on the speeds is great, good or bad performance for the most important card in its hardware itself , then we only have excellent properties by selecting a card for this purpose. I give you the choice card in when some advice: The best choice 10/100M adaptive network card, do not select those 10M network card; best not to select those ISA interface products.
(3) Select-performance ADSL "Cat"
And similar cards, ADSL network is another important device ADSL "cat" and also directly affects good and bad performance speeds of fast and slow, and now most users in the installation of ADSL, the bureau are all ready for ADSL "Cat" Often in these ADSL "Cats" performance are not the best, as we can go to the computer peripherals market, relatively hard buy some brands of equipment, see more products in the choice of performance parameters, intuitively, we can through ADSL "Cat" brand of products, work is fine, and packaging to determine, for example: Shida company, UT Starcom Inc. of products these two companies is still quite a good reputation.
2. Optimization software
In addition to hardware optimization program, we also can make use of some of the ADSL software to optimize the software itself, often starting from the hardware optimization, combined with the system parameters related to optimal settings to achieve the optimization objectives.
ADSL Overclocking Jones
Software Version: 2.02
Software Size: 1153 KB
Software Type: Freeware
Application Platform: Windows 9x/2000/XP
Download: http://dl.pconline.com.cn/html/1/4/dlid=5064&dltypeid=1&pn=0&.html
OC Jones and the ADSL speed ADSL software. PC system registry by modifying the original low-speed access to the settings for the TCP / IP default parameters, to adapt to the way PPPoE ADSL access. Measured can be about double the download speed, and solve the slower ADSL problems browsing the web. Download and install the software to begin after the system is running, run the window 4 shows.
Figure 4 ADSL interface overclocking Jones
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In this, the program provides two optimization scheme, one is ordinary overclocking, the other is advanced overclocking, general overclocking is simple to use, direct-click the window shown in Figure 4 in the "ordinary overclocking" button, the program that parameters can be optimized using the default parameters instead of the current system, let's look at the major advanced overclocking features.
Click the "Advanced Overclocking" button to see the high overclocking of the window shown in Figure 5.
Figure 5 High overclocking window interface
Conducting high-level overclocking, we should first detect MTU value, the operation is simple and direct as shown in Figure 5, the window in the "Select Check Site" drop-down list, select a particular site, then click the "Start Test" , test procedures such as the end of a connection to the site will be the best MTU value, as detected by an MTU value of a site are not necessarily accurate, and can be detected by the same method more than a few websites. Finally, click the "Advanced overclocking" button to reboot the system to complete the optimization.
In addition, OC Jones provided a "system restore" function, if you are not satisfied with the previous optimization settings, or optimized in trouble, you can restore this function to optimize the system state before, just click in Figure 5 The "System Restore" button to achieve the purpose.
Tips: MTU means Maximum Transmission Unit. MTU determines the size of packets, if packets are too small, the same size will be divided into lots of data packet transmission, the computer had to frequently respond; if the information packet will be too large an error, leading to transmission failure.
Network Hurricane (Netspeeder)
Software version: 2.1
Software Size: 1926 KB
Software Type: Shareware
Application Platform: Windows 9x/NT/2000/XP
Hurricane Network is a optimization software developed by people, can optimize the Modem, ADSL and other equipment. Download and install the software into the system to start the trial, as is the sharing of software, each time you run the former will open a register window, just click "Close" to display the main program window.
Use optimization wizard: If we optimize the network is not too familiar, you can let the wizard to help us fast optimization, click "Optimization Wizard" will enter the optimization wizard, in this guide, we should be following some of the settings: Select the Internet type of interface (a network connection interface), and finally click click "OK" and then look at the system restart to complete the optimization purposes.
Manual optimization: direct click, "fine-tuning" icon, and then we can fine-tune the right window of the relevant parameters, shown in Figure 6.
Figure 6 fine-tuning options
We can manually set the MTU value, TCP received packet size and some other parameters, is set up after the click "Apply" button to reboot the system to take effect.
Tip: There are a lot of optimization software, such as "ultimate Internet Speed" (Download Address: http://www.skycn.com/soft/8508.html), "Throttle"
3. Optimizing DNS
DNS domain name system, domain name in a TCP / IP architecture of the network (eg Internet) environment, DNS is a very important and commonly used system. The main function is to people easy to remember Domain Name and the people do not easily remember the IP Address for conversion, it is optimization of DNS for the network speed has improved to some extent. Click the "DNS Accelerator" button, the window will display the list of favorites in most of our website, then select "Settings" tab and "Enable DNS optimization" option selected, so that we can optimize DNS, purpose of the.
As the optimization of network parameters, its not very familiar to some readers, it would be best to use the program's default settings to be optimized.