20mbps is 160M megabit broadband (theoretically); theoretically, the conversion between rate and bandwidth is 8 times. In other words, 4M bandwidth is theoretically the actual download speed 4 divided by 8, that is, 0.5MB /s, that is, 500KB/s; on the contrary, if you download at a speed of 20 megabytes per second, the theoretical bandwidth is 20 times 8, which is 160 megabits, usually 20Mbps.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
How much bandwidth is 20mbps?
160M bandwidth (theoretically). The conversion between rate and bandwidth is (theoretically) 8 times. In other words, 4M bandwidth is theoretically the actual download speed 4 divided by 8, which is 0.5MB/s, or 500KB/s.
On the contrary, if you download at a speed of 20 megabits per second, the theoretical bandwidth is 20 times 8, which is 160 megabits, usually 20Mbps. Note that the downlink rate is not equal to the download rate. Usually, when we download software or movies, we can only achieve 1MBps instead of 20Mbps.
In fact, 20M broadband is 20M bits, not 20M bytes. According to the formula of 8 bits = 1 byte, we calculate: 20Mbit = 20480Kbit = 2560KByte, so in theory the maximum download speed of 20M broadband should be 2M. Due to some other factors, it is normal for the actual download speed to be around 2M.
Extended information:
Broadband has no strict definition. From a general perspective, it can meet the bandwidth of various media that people can feel in network transmission, so it is also a dynamic and evolving concept.
In the annual broadband progress report released by the Federal Communications Commission (Federal Communications Commission) on January 7, 2015.
Current chairman Tom Wheeler has redefined the term "broadband" from 4Mbps downlink to 25mbps and from 1mbps uplink to 3Mbps.
The upstream rate refers to the data transfer rate when the user's computer sends information to the network. Downstream rate refers to the rate at which the network transmits information to the user's computer.
Of course, in the actual uploading and downloading process, the quality of the line and the speed of the equipment (including computers and other equipment) will also have more or less impact.
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