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Digital Enhanced Cordless Telecommunications (DECT) is a cordless telephony standard maintained by ETSI.It originated in Europe, where it is the common standard, replacing earlier standards, such as CT1 and CT2. [1]
CAT-iq allows IP-DECT gateways with integrated NG-DECT base stations operate in full-feature mode with any certified CAT-iq 2.0/2.1 handset, regardless of different vendors and silicon or software protocol stack implementations. The base stations will also work with GAP handsets, though supporting only the basic GAP features.
However, DECT 6.0's late start compared to DECT elsewhere has led to a large installed base of legacy cordless phones using other frequencies, many of which remain in use today despite increasingly common interference with the ever growing use of Wi-Fi, Bluetooth and other unlicensed digital radio standards, especially at 2.4 GHz and 5.8 GHz.
This page was last edited on 4 September 2024, at 09:00 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. To reduce interference with other protocols that use the 2.45 GHz band, the Bluetooth protocol divides the band into 80 channels (numbered from 0 to 79, each 1 MHz wide) and changes channels up to 1600 times per second.
The transmission media (often referred to in the literature as the physical medium) used to link devices to form a computer network include electrical cable, optical fiber, and free space. In the OSI model , the software to handle the media is defined at layers 1 and 2 — the physical layer and the data link layer.
The first Bluetooth device was revealed in 1999. It was a hands-free mobile headset that earned the "Best of show Technology Award" at COMDEX. The first Bluetooth mobile phone was the unreleased prototype Ericsson T36, though it was the revised Ericsson model T39 that actually made it to store shelves in June 2001.
Skype supports conference calls, video chats, and screen sharing between 25 people at a time for free, [62] which then increased to 50 on 5 April 2019. [ 63 ] Skype does not provide the ability to call emergency numbers , such as 112 in Europe, 911 in North America, 999 in the UK or 100 in India and Nepal. [ 64 ]