Cordless 3D Models

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3D Models of Cordless Phones.

They are a system consisting of a base, to which analog or digital subscriber lines from the PBX are connected, and one or several cordless handsets, which can both communicate with each other and call external lines.

Can use different types of modulation.
Work at different frequencies. Previously, only analog devices with a carrier frequency of several tens of megahertz, which were subject to distortion and, basically, were equipped with only one tube, were produced.

Then, phones with a 900 MHz carrier frequency and digital signal coding appeared on the market; their sound quality is better, the range of reliable work is increased, and accidental eavesdropping on your conversation by neighbors is excluded.

The next step was the phone with a carrier frequency of 2.4 GHz. These devices are sometimes made with several handsets, increased communication range, and sound quality.

Recently Phones with a carrier frequency of 5.8 GHz appeared on the market, having a communication range sometimes sufficient to operate within a quarter with good sound quality without mutual interference in apartments; often allow to connect several tubes.

Modern Cordless telephones, the most popular is the use of the DECT protocol (Digital Enhanced Cordless Telecommunication) – wireless communication technology at frequencies of 1880-1900 MHz with GMSK modulation (BT = 0.5). The range of 50-300 meters. The DECT standard is not only widely used in Europe but is also the most popular standard for a cordless phone in the world, thanks to the ease of deploying DECT networks, a wide range of user services, and high-quality communications.