# What does the network speed mean? What does bandwidth mean? What is the download speed of 1 Mbit/s network speed? [Convert to. Baidu]

Source: Internet
Author: User

Uncover the real speed of ADSL
Users who often use ADSL, do you know the real speed of ADSL? With this question, we will expand the problem step by step.
Many users report that,
Left and right! This is a misunderstanding caused by unclear conversion relationships.
512 K = 512 kbps = 512 kbits/S = 64 Kbytes/s (1 m = 1024 K) I think this conversion should be fine.
2. What does 64 Kbytes/S mean?
The true meaning of this 64 K is "the maximum download bandwidth that individual users can enjoy exclusively"
So what does this mean? I don't know if anyone has noticed the Application Form for installing China Telecom ADSL. The above bandwidth projects are all "no higher than K ", "no higher than 8 m", and so on, that is, we can have a maximum of 64 K proprietary bandwidth under normal circumstances.
Note that the value is "no higher than". That is to say, in many cases, our private bandwidth may be less than 64 KB. Why?
In fact, China Telecom's ADSL is running on the ATM, and the bandwidth from the ATM to the Chinanet edge router is 155 M. Each edge router can connect 3000 users. If these users access the Internet at the same time, in fact, each user only has 50 kbit/s of bandwidth, that is, 7 Kbytes/S. In addition, with the attenuation of the router, the speed of the common Modem may end up.
Of course, the above is just a hypothetical situation. After all, it is almost impossible for 3000 people to connect to an edge router at the same time. China Telecom will not allow the router to be connected at full load, making the speed drop so huge.
However, 64 K is undoubtedly the highest private bandwidth.
We figured out that 64 K is the maximum private bandwidth, but not equal to the maximum bandwidth. In fact, when dialing ADSL, we have allocated a download bandwidth of approximately 8 Mbps, that is, 1 Mbytes/s, however, China Telecom limits our VPC bandwidth to a maximum of 64 K, so when there are few vro connected users, we can obtain a portion of the shared bandwidth that exceeds the proprietary bandwidth (obviously, telecom does not need to idle the bandwidth ), of course, the K rate of ADSL can never reach the download speed of 1 Mbit/s by occupying the shared bandwidth, because after all, there are still many people surfing the internet at the same time, moreover, China Telecom certainly has some load balancing mechanisms.
TCP/IP stipulates that each packet must have a backend message of acknowledge. That is to say, a message reply is required for the transmitted data to determine the transmission speed, and decide whether to re-transmit the lost data.
In this case, we cannot limit the speed of all people, because it is unrealistic and unscientific for ADSL users. The appropriate speed limit is correct.
5. The speed of ADSL gradually decreases as the connection time increases.
As mentioned above, the maximum download bandwidth of 8 Mbps will be set up when ADSL is re-called. This bandwidth will never change! However, in fact, because of the noise detection mechanism of ADSL, if the line is not good, the connection established at the beginning is obviously impossible to reach the theoretical value. It may end with 5 Mbps, and the bandwidth will not change.
There are also some ways to maintain ADSL on the hardware, such as shortening the telephone line between the telephone outlet and the ADSL modem as much as possible, which can minimize the line loss, the specific operation can shorten the distance between the telephone outlet and the ADSL modem, and lengthen the network cable connecting the modem to the PC, without reducing the speed. In addition, do not place office devices (including personal computers) that emit electromagnetic waves near the ADSL modem, or household appliances and mobile phones such as televisions and refrigerators, which may interfere with the modem. People familiar with computers should know that the performance of personal computers depends not only on their own hardware base, but also on the software optimization of computers in the future can become the driving force for the Network to fly. On the one hand
The system's own performance can be improved through a number of "extensive" system optimization software, the CPU vacancy rate, memory usage, hard disk fragmentation cleaning, and so on, can be improved through the power of software. On the other hand, some special software can also be used to optimize the broadband access connection network and randomly adjust some network connection settings to achieve the best connection effect.
Glossary:
Bit
Byte bytes (note the case sensitivity of the B letter here)
1 mbps bandwidth is 1 Mbps
Translation:
1 mbitspersecond = 1 Mbit/s
The download speed of the operating system in the computer is calculated by KB/s or MB/s.
Kbytespersecond = Kbytes/s (kbyps or kb/s)
Or mbytespersecond = Mbytes/s (Mbps or MB/s)
1 byte = 8 bits
So
2 Mbps = 2048 Kbps = 2048/kbps = 256kb/s
Consider other factorsOver 200 K/SIs the fastest

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