Nowadays, we basically use amplification signals and switches for routing and connecting machines, but we cannot connect machines. However, there are also large switches available.
The English abbreviation is ICD, and the full name is Industrial Communication Device. Wired communication equipment mainly refers to serial communication in industrial sites, professional bus type communication, industrial Ethernet communication, and conversion devices between various communication protocols. Wireless communication devices mainly include wireless APs, wireless bridges, wireless network cards, wireless lightning arresters, antennas, and other devices.
Wi Fi communication device WirelessFidelity is a short range wireless technology used in offices and homes. This technology uses a frequency band near 2.4GHz, which is currently an unlicensed wireless frequency band. There are currently two standards that can be used, namely IEEE802.11a and IEEE802.11b. The so-called WiFi communication devices should refer to communication devices that support this technology.
The theory of electromagnetic waves was founded by Maxwell, and the Italian Marconi invented the telegraph communication equipment based on electromagnetic waves, while Bell was the inventor of the telephone
Wireless communication is the use of radio waves instead of cables to achieve communication between devices. This communication method has the advantages of fast and simple installation and maintenance, not affected by the terrain environment on site, and low cost. The rich products can meet the different needs of users in terms of communication distance and communication speed.
Category of communication equipment
1、 Mobile communication devices
Mobile communication devices are wireless communication devices based on mobile communication technology. At present, common mobile communication devices mainly include multiple categories such as smartphones, tablets, mobile routers, and mobile landlines. Smartphones and tablets have become essential communication devices in people's daily lives, and mobile routers and fixed phones have also been widely used in mobile office and mobile life.
2、 Fixed communication equipment
Fixed communication equipment refers to devices installed in a fixed position for communication. Mainly including fixed telephone, fixed broadband access equipment, office equipment, etc. Fixed line telephones were the earliest communication equipment and are still commonly used in residential and office settings. Fixed broadband access equipment mainly includes fiber optic broadband ADSL broadband is the main way for households and businesses to access broadband.
3、 RF equipment
Radio frequency equipment is a device used to transmit and receive wireless signals, mainly including wireless walkie talkies, radio transmitters, radars, etc. Wireless walkie talkies and radio transmitters are widely used in industries such as law enforcement and firefighting, while radar is mainly used in fields such as aircraft navigation and geological exploration.
4、 Fiber optic equipment
Fiber optic equipment refers to equipment used to transmit optical signals, mainly including light sources, optical modules, fiber optic connectors, optical switches, etc. Currently widely used in fields such as data communication, fiber optic communication, and computer room construction.
Overall, communication devices cover many categories, among which mobile communication devices and fixed communication devices are the two most common types. RF equipment and fiber optic equipment are devices applied in specific fields, and specific applications depend on specific circumstances. Understanding the categories of various communication devices can help people better choose and apply communication devices.
Optical signals are mainly divided into business channels and management channels.
Starting from the switch, the switch transfers business traffic to the client port of the TXP/MXP board, and then the Chunk port enters the 40OD or WXC wavelength division equipment. The optical power is amplified by an erbium-doped/Raman amplifier, and the management optical signal transmitted from the engine card is added to the OADM card. The synthesized optical signal is then transmitted to the opposite end through the intermediate amplification node, and the opposite end amplifies the signal before reverse processing and parsing it into the original business traffic.
Add a few points.
1/The main protective measures include PSM, WSON
2/Cards with secure function are not allowed to be sold in China, I am not very familiar with them
3/There may also be devices such as optical attenuation and dispersion compensator in the middle
4/Domestic fiber optic cables are unreliable, and the links of operators should not fluctuate too much
5/Cisco equipment always receives optical signals during transmission. It is said that friendly equipment first restores electrical signals at amplification stations and then converts them into optical signals for amplification, using electrical crossover technology
Communication equipment: telephone, mobile phone, radio switch
There are currently three main communication operators in China: China Telecom, China Unicom (Netcom), and China Mobile
There are many mobile phone brands, such as Apple, Samsung, HTC, Nokia, Sony, etc
Domestic allowed registration of radio equipment: Motorola, Siemens, etc
Communication switches: Siemens, Nokia, Alcatel, Motorola, Philips, Sony Communications, and many other brands. However, currently there are more Sinoswitch and Alcatel switches used domestically.
