What is the relationship between network speed, broadband, bandwidth and traffic?

Broadband ： That is, the line connected to the WAN , It can be simply understood as optical fiber access of telecommunication connection , Or a highway .
bandwidth ： The theoretical upper limit of broadband access , And up （ Namely outflow ） Bandwidth and downlink （ Namely inflow ） bandwidth , For example, it is often said that 100Mbps Home broadband , That is to say, the maximum download of this access line （ The downside ） Speed is 100Mbps（12.5MB/s）, The uplink will generally be much smaller , Maybe it's just 5Mbps. Just understand it as the width of the highway .
Network speed ： Current network data traffic speed , Minimum 0MB/s, The maximum bandwidth limit is not exceeded . It can be imagined as the traffic flow on the highway .

Broadband

We can think of it this way , such as , Others will say whether your family can surf the Internet ？ In fact, this means whether your family has broadband , let me put it another way , It's a noun , First came the word Broadband , Then you can say how much bandwidth you have , It has nothing to do with the speed of surfing the Internet .

bandwidth

For example, we want to apply for broadband , I will definitely register with some providers , At this time, according to the different packages , You may have 10Mb/s 、 20Mb/s etc. , When we know some conversion units of computer , You can see that , such as ：

1B=8b
1KB=1024B
1MB=1024KB
1GB=1024MB

The bandwidth we applied for is 10Mb/s In this unit b It's lowercase , And what we just said 1B=8b, This happens to be 8 Times the relationship , namely Download speed ：10Mb / 8 = 1.25MB
Some people will ask , Why divide by 8, First, in our computer , The download speed is in bytes (B) Unit , The provider is talking about bits (b) Unit .
for instance , We download a software on the Internet , with B Unit , Another example is that you open a web page , There may be pictures on this page , written words , Video and so on , These contents are essentially , Also downloaded to your computer , Then you can see .

We can also calculate our download speed according to our home bandwidth ：
The bandwidth is 2Mb The download speed is 256KB/s
The bandwidth is 4Mb The download speed is 512KB/s
The bandwidth is 8Mb The download speed is 1.00MB/s
The bandwidth is 10Mb The download speed is 1.25MB/s
The bandwidth is 20Mb The download speed is 2.50MB/s
The bandwidth is 100Mb The download speed is 12.5MB/s

sometimes , When you use some software to test the network speed , It is found that there is a little gap with our calculated results , This is a normal phenomenon , This is caused by objective reasons such as wear and tear of some physical circuits .

And sometimes , When people download software late at night , Will find , The download speed is faster than what we theoretically calculated , This is also true , We can think of it this way , For example, your home is J District , Then the provider pulls to J The main line of the district is 100Mb/s, And your family applied for 10M, Because the restrictions are set from the router , This is related to the settings of the router . The second situation is , The server where you download the software is idle , This is also faster , The third case is when we download the software , You may use Xunlei's software , Because there are many people downloading this software , Then his speed is also relatively fast .

In common sense ：

Bandwidth is the size of your faucet , The Internet speed is better than how fast the water comes out of the tap .
All the above are about download speed , How to calculate the upload speed , In fact, the upload speed is different from the region , Generally, the upload speed is limited by the provider , I'm not sure about that .

Traffic

It is the sum of the size of external sending data and receiving data packets , The unit is to take 1024 It's binary , The unit has B,KB,MB(M),GB(G)

1M=1024KB
1KB=1024 byte （B）

Generally, our mobile traffic packages have 5 element 30MB,10 element 70MB The etc. , For example, we open a web page , How much traffic is needed ？
Suppose there is... On a web page 100 A Chinese character and a 100KB Pictures of the , A Chinese character =2 Bytes , That is, the data size of this page is ：100*2B/1024 + 100KB= 0.2KB +100KB =100.2KB;
Every time you visit this page , Will produce 100.2KB Of traffic , If it is 70MB Of traffic , Then visit a few web pages almost gone , So not to mention watching videos .