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Communication Equipment

Communication Equipment


Communication equipment includes telephones, mobile phones, PHSs, walkie-talkies, pagers, fax machines, etc. and supporting products.

1. Telephone

As early as the 18th century, Europe had the term "telephone", which was used to refer to a microphone stringed with wires (a cup is stringed with a wire). The emergence of the telephone is attributed to Alexander Graham Bell. The principle of the early telephone is: the sound of speech is a compound vibration in the air, which can be transmitted to a solid and transmitted on a conductive metal through an electric pulse.

2. Mobile phone

Mobile phone, or wireless phone, usually called mobile phone, was originally just a communication tool. In the early days, it was commonly known as Big Brother. It was a portable phone terminal that could be used in a wide range. It was first developed by Bell Labs in the United States. The battlefield mobile phone was developed in 1940.

3. PHS

PHS uses micro-cell technology to achieve wireless coverage through micro-cell base stations. The user terminal (ie, wireless local phone) is connected to the local telephone network in a wireless manner, so that fixed phones in the traditional sense are no longer fixed at a certain location. It can be used freely within the coverage of wireless network, and can receive and make local, domestic and international calls anytime and anywhere, which is an effective extension and supplement of local calls.

4. Walkie-talkie

The English name of the walkie-talkie is two way radio, which is a two-way mobile communication tool. It can make calls without any network support. There is no call charge. It is suitable for relatively fixed and frequent calls. There are currently three types of walkie-talkies: analog walkie-talkies, digital walkie-talkies, and IP walkie-talkies.

5. Pager

The receiver of the called user in the radio paging system. It is composed of superheterodyne receiver, decoder, control and display. It selects the useful signal that it needs to receive from the paging signal and interference transmitted by the base station, restores the original baseband signal for paging the machine, and generates sound (or vibration) and displays digital (or letters, Chinese characters) messages.

6. Fax machine

Fax machine is a communication device that uses scanning and photoelectric conversion technology to convert still images such as documents, charts, and photos into electrical signals, which are transmitted to the receiving end and copied in the form of records.