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This article mainly introduces what is the basic transmission unit of the tcp/ip physical layer in the Internet. It is very detailed and has a certain reference value. Interested friends must read it!

The basic transmission unit of the tcp/ip physical layer is bit. Bits, which are units of information, are transliterated from English BIT. It is also the bit in the binary number, the unit of measurement of the amount of information, and the smallest unit of the amount of information.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

The basic unit of the TCP/IP protocol can be said to be a packet. Because the main work of TCP/IP protocol is to transmit data, and to make sure that the data has been delivered and received, and the next layer after data is processed by TCP/IP protocol is the network layer, and the data unit of the network layer is data packet, so it can be considered that the basic unit of TCP/IP protocol is data packet.

The unit of the network layer is the packet (packet); the data link layer is the frame (frame); and the physical layer is the bit (bit).

Bit, a computer term, is a unit of information, which is transliterated from English BIT. It is also the bit in the binary number, the unit of measurement of the amount of information, and the smallest unit of the amount of information. The information necessary to halve the number of alternative stimuli when different choices need to be made. That is, the amount of information (bits) of the signal is equal to the logarithm of the signal stimulus with 2 as the base. l. Hartley thought in 1928 that it was most appropriate to measure the amount of information in logarithmic units.

The physical layer is mainly physical transmission media and signals, the mainstream signals are analog signals and digital signals, and the transmission media are mainly twisted pair and optical fiber.

Analog signal: a constantly changing physical quantity with weak anti-interference and attenuation, mainly used in telephone networks.

Digital signal: two kinds of constant physical quantity, some anti-interference and anti-signal attenuation, suitable for computer network, is the current mainstream signal.

Twisted pair: classified by function: shielded and unshielded

Classified by rate: category 5 100 megabit lines, over category 5 100 megabit lines, transmission speed several times faster than category 5 lines, category 6 gigabit lines

By interface: standard 568A: green-white, green, orange-white, blue, blue-white, orange, brown-white, brown; standard 568B: orange-white, orange, green-white, blue-white, green, brown-white, brown.

Optical fiber is divided into: single-mode multimode, core thick and fine, low speed and high speed, near and long transmission distance, cheap and expensive, connector: FC,LC,ST

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