What is an 2.4GHz digital cordless telephone?
Cordless telephone is a wireless duplex mobile telephone device that can enter PSTN. It consists of a landline connected to the PSTN subscriber line and one or more handheld cordless telephones that perform the function of the ordinary telephone within a defined range.
2.4GHz refers to a working band, 2.4GHz ISM (Industry Science Medicine) is a worldwide public radio band universal use, Bluetooth technology is working in this band, the anti-interference ability at 2.4GHz band can be obtained using larger and stronger, is widely used in household and commercial areas. 2.4GHz wireless technology is a short-range wireless transmission technology for open source use.
The basic development of cordless telephone is a public telephone network, 1970s, when the economy of developed countries PSTN has been very popular, almost every family have installed ordinary electronic telephone, using the phone to solve problems in daily life and work has become a habit. But the telephone should be connected to a telephone office with a dual core telephone line, and the telephone's landline must be connected to the handle with a microphone with a four core cable. Therefore, the telephone is restricted and can not be moved at will. To this end, people in other rooms in parallel with an extension to solve the problem can not be moved freely. But if people are outdoors, it's a big problem to call at will. In this demand, a new type of mobile communication way, between the handle and the phone is equipped with headset microphone connected by radio telephone, cordless telephone came into being.
