Internet101-1-Wires, Cables & WiFi (wire, cable &wifi)

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.

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Internet101-1-Wires, Cables & WiFi (wire, cable &wifi)