【 Weak current College 】 network bandwidth and speed

"Bandwidth" and "speed" in the strict distinction between the concept of

In fact, the so-called 1M broadband refers to 1Mbps (the megabits per second), i.e. 1x1024/8 = 128KB/sec, but this is just a theoretical speed, actually is to be detained for about 12% of the information header identifies a variety of control signals, so the transfer rate limit should be around 112KB/sec. Here is a list of all the relationships between the speed unit:

1Byte=8bits

1Kb=1024bits

1KB=1024bytes

1Mb=1024Kb

1MB=1024KB

Here it should be noted that the wording of the transport unit, the B and b represent Bytes and bits, which is defined as different, be sure not to confuse.

Therefore various broadband download value of limit can also be easily calculated.

1M=112KB/s

2M=225KB/s

8M=901KB/s

10M=1126KB/s

Mbps is actually a bandwidth units, rather than speed units, "Mbps" unit "b" means "Bit (bit)." But the real speed units should be MB/s, one of the "B" means "Byte (bytes)". Because the data is transmitted by bytes rather than bitwise.

Because both large and small different "B" and "b", making these two units must not be identical, and very different. Of course they also exist between larger associations, 1MB/s = 8Mbps, can be understood, that is, the port is the port's bandwidth the theoretical maximum transfer rate, the actual speed of much smaller than the bandwidth value (usually 60 ~ 80%).

The current market offers bandwidth leased Internet company, neither the above the bandwidth of a single argument, in my opinion, the various experts are summarized below:

Network bandwidth is also called bandwidth is defined as a fixed period of time the amount of information can be transmitted, i.e. in the transport pipeline can ability to transfer data. In digital devices, the bandwidth is usually expressed in bps, i.e. per second transmission of digits. In the analog devices, the bandwidth is usually transmitted cycle per second, or Hertz Hz. Bandwidth on basic input output system (BIOS) devices are especially important as fast disk drives will be affected by the low-frequency wide bus.

Especially overseas IDC on bandwidth, roughly divided into local bandwidth and international bandwidth, local broadband, as its name suggests, refers to the IDC region bandwidth (although Hong Kong Taiwan belong to China, but from mainland China to Taiwan belong to the international bandwidth), Hong Kong and Taiwan regions local bandwidth are 100M, dedicated and shared, similar to our community LAN fiber Internet access point, but a local that belong to the international bandwidth, even if it is to China that belong to the "international". Part of the IDC commitment can give users a few M of exclusive, insider those are some of the local computer, but user most M are in mainland China, Hong Kong local number of bandwidth, and the user does not have a relationship. The key lies in the Mainland to Hong Kong's bandwidth, which is the international bandwidth, and the so-called point-to-point bandwidth. This section of the international bandwidth prices are relatively expensive, and local bandwidth prices are not in the same breath. For example, their own check with the local telecommunication network, 2M year 900RMB and international bandwidth to several thousand dollars a month 2M.

So how do you test room bandwidth and speed?

At present, IDC market rapidly, the virtual IDC operators like sprang up, no matter how big small IDC all boasting of how good bandwidth, speed, how fast, in fact, there are a lot of mistakes. We first take a look at how to properly test the speed of a computer room.

Fujian: http://www.21idc.com.cn/speedtest.asp

Hong Kong: http://219.90.116.157:88/speedtest.asp

Taiwan: http://tw.21idc.com.cn/speedtest.asp

In addition, you can use PING to observe local to the target server's response, PING method as destination IP or domain name can be, for example, PING out 21idc.com.cn: 218.85.132.215. the start menu-run-> > > enter CMD-enter in the DOS interface "ping21idc.com.cn-t" a good room rate, the first packet loss rate cannot be more than 1 per cent, preferably 1000 ping no packet loss, this is the ideal, but this is not an absolute value, as long as less than 1 per cent of the routes are good. Second ping value to small, local telecom adslping mean absolutely cannot exceed 10 20, generally, overseas such as Hong Kong Taiwan ping average should be 20-40 is normal. The third point is ping value to uniform, and the size of large and small, are all within 100 gap routing instability.

At the same time, the test route tracertrouter this is take a look at the test point to the destination server takes many routers, and under each of the number of milliseconds that the route to slow in the router, and to see this through www.123cha.com ip belongs to the carrier, or even the provinces of operators, so that you can see at a glance.

ThenTake a look at the user's own how to test your own server, the allocated number of IDC what bandwidth?

Test method also has two, first installed on the server software, can real-time DU concern your server bandwidth usage. Upload, download, is part of the normal range; second: at the server using FTP, pull a capacity bigger file, we can see the peak reached number K, and how to start the conversion, the article has been clarified.

Xiamen hymo technology co., Ltd. (website brand "new century data center" http://www.21idc.com.cn) was established in 1999, is the oldest and biggest one IDC operators. In line with the principle of good faith, commitment to quality and service of faith and does not participate in market competition with malignant price is committed to providing users with first class A class room, eliminated despite prices low but the quality is not good room. Limit the number of the server cabinet, ensure that each server is functioning smoothly. Have independent NOC (nnmc), on the national node and the node such as Hong Kong Taiwan United States implement 24 x 7 x 365 x 7 real-time monitoring and maintenance management; senior/maintenance engineers 24 x 7 telephone, email, QQ online and on-site technical support services, in particular, Xiamen hymo company directly in the main room residency network management engineer, including the front line, the new world, Internet communications, IDC and Taiwan Chunghwa Telecom, speed, and network, etc., arrangements for IDC company's own technical staff to ensure that the first time responding to the needs of the client.