Introduction to broadband rate, the relationship between bandwidth and speed

Let's first understand the relationship between several network speed quantifier units:

1 byte = 8 bits

1 kb = 1024 bits

1 kb = 1024 bytes

1 mb = 1024 kb

1 mb = 1024 kb

1. Mbps is a unit of bandwidth, and the "B" in the "Mbps" unit refers to "bit". Bandwidth is described in bits.

2. MB S is the unit of speed, and the "B" in "MB S" refers to "Byte". Because the data is transmitted by bytes.

3. The so-called 1M broadband actually refers to 1Mbps (megabits per second), that is, 1 x 1024 8 = 128KB sec, but this is only a theoretical speed, in fact, about 12% of the information header identification and other control signals need to be deducted, so its transmission speed is about 112KB sec.

4. In the same way, the limit value of various broadband can also be easily calculated: 1 m = 112 kb s2 m = 225 kb s8 m = 901 kb s10 m = 1126 kb s Network bandwidth, also known as bandwidth, refers to the amount of data that can be transmitted in a fixed time, that is, the ability to transmit data in the transmission pipeline.

5. In digital devices, the bandwidth is usually expressed in bps, that is, the number of bits that can be transmitted per second. In analog devices, bandwidth is typically expressed in cycles per second or Hz per hertz. Bandwidth is especially important for basic input-output system (BIOS) devices, such as fast disk drives, which are hindered by low-bandwidth buses.

It refers to the amount of data that can be transmitted at a fixed time, that is, the ability to transmit data in a transmission pipeline. It is usually expressed in cycles per second or hertz (Hz).

For example, if you use the bandwidth of 20MHz and 40MHz as an example, you can think of the width of the road, and the wider the width, the more data you can run at the same time, and the speed will increase.

Of course, the "road" of the wireless network is shared by everyone, and it is so wide in total (the frequency band of b g n is a total of the frequency band available in China is also 60MHz), the road you occupy is wide, and you run more data, of course, it is easier to crash with others, once you crash, everyone will slow down, slower than you walk on the narrow road, refer to this figure:

Home broadband speeds are expressed and illustrated in ADSL 4M, 6M, 8M, 10M, Fiber 10M, 20M, 50M, 100M, and there will be faster fiber 1GB in the future.

This 1m means 1mb s, which is similar to the maximum amount of water flowing out of a water pipe in 1 second.

And 1GB is 1024MB s

In the calculation of network speed, b=bit and b=byte

8 b = 1 b means that 8 lowercase bs are an uppercase b

The definitions of the two debaters are different and should not be confused.

Note that the unit has been changed to kb s by formula

1. And so on:

<>2. Formula: A few megabytes of bandwidth 1024 8=several kbs

3. Speed measurement chart of 20m broadband:

1. Calculate the theoretical velocity of 20m according to the above method: 20 1024 8=2560kb s

2. The measured speed is:

3. You can see that the gap is not very obvious, which is acceptable for destruction, because the online experience is basically not felt.

In fact, the loss of the middle line in the middle of the line, some connections are lost due to speed limiting, and the throughput of the receiving client's network card is not enough during peak hours of Internet access.