content source : khanacademy-internet101-wires, cables, and WiFi
(the original video and subtitles in English, the following Chinese content for personal understanding after the translation, for reference only)
1. Related nouns :
High traffic
High Flow
Fibre-optic
Fiber
Antenna
Antenna
Spherical
Sphere of
Bandwidth Bandwidth
Transmission capacity, measured by bitrate transmission capacity, measured in bitrate
bitrate ratio/bit rate/bitrate
The number of bits per second a system can transmit one bit per second
Latency Delay
Time it takes a bit-to-travel from the sender to receiver when a bit is taken from the sender to the receiving party
2. Conversion
Bytes = 1 kilobyte (1 Kb)
kilobytes = 1 megabyte (1 Mb)
In binary memory,
1024x768 Bytes = 1 kilobyte
1024x768 kilobytes = 1 megabyte
The Atom of information
BITS-a information atom
3. Connections and differences between wires, cables and WiFi
They are different ways of transmitting signals.
|
Things to transmit
|
Wire Wires
|
Electric Electric |
Cable Cable
|
Light |
Wifi
|
Radio Radio |
Speed of transmission of signals wire < Cable < WiFi.
Other than that
|
PRO |
CON |
Electric |
Cheap Cheap |
Signal Loss Signal Loss |
Light |
Fast transfer speed |
Expensive expensive |
|
No Signal Loss No signal loss. |
Hard-to-work with Inconvenience, for example, to use a network cable |
Radio |
Wireless Wireless |
Signal Loss Signal Loss |
Ps:
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Give an example to understand the concept of bandwidth and bitrate:
Suppose a person whose network connection bandwidth is 10MBITS/S, the bitrate will not exceed 10mbits/s unless the bandwidth increases. When trying to download a file, the download speed may generally be <1.5mbits/s.
Above these two 10mbits/s, 1.5mbits/s all refers to the code rate, the first 10mbits/s to describe the size of the bandwidth.
)
Internet101-1-Wires, Cables & WiFi (wire, cable &wifi)