20) Transmission Media (Wi-Fi (a, b, c), Bluetooth, IrDA, RJ11, RJ45, RS-232)

20) Transmission Media (Wi-Fi (a, b, c), Bluetooth, IrDA, RJ11, RJ45, RS-232)
-WiFi 802.11a
The first revision of the 802.11 standard was born back in 1999 and operates over the 5 GHz frequency band, with a maximum speed of 54 Mbps.
-WiFi 802.11b
The revision 802.11b soon began to enjoy great general acceptance due to the fact that operating in the 2.4 GHz band reduced the attenuation eliminating many interferences improving the quality of the Wi-Fi signal.
- WiFi 802.11ac
The new WiGig standard brought the great speeds to wireless connections and proof of this is the advance achieved with Wi-Fi 802.11ac.
-WiFi 802.11ad
The Wi-Fi technology baptized as WiGig is also one of the most recent and although it is still not very well known to the general public, it will soon begin to be so due to its incredible potential. Not only because equipment compatible with it has already been announced, such as the Talon Ad7200 from TP-Link, but above all by the speeds of up to 4.6 Gbps it can offer in the 60 GHz frequency band.
-Bluetooth: is an industrial specification for Wireless Personal Area Networks (WPAN) created by Bluetooth Special Interest Group, Inc. that enables the transmission of voice and data between different devices through a radio frequency link in the ISM band of 2.4 GHz.
-IRDA: Infrared Data Association (IrDA), "Infra-Red Data Association", defines a physical standard in the form of infrared transmission and reception of data. IrDA was created in 1993, between: HP, IBM, Sharp and others. This technology is based on light rays that move in the infrared spectrum.
-RJ11: RJ11 plug. The RJ11 connector (RJ stands for Registered Jack) is the most used connector for telephone lines. It is similar to an RJ45 connector but smaller. On a computer, it is usually used to connect the modem.
-RJ45: It is a physical interface commonly used to connect computer networks with structured cabling (categories 4, 5, 5e, 6 and 6a). It has eight pins or electrical connections, which are normally used as twisted pair cable (UTP) ends. It is part of the United States Federal Code of Regulations
-RS-232: (Recommended Standard 232, in Spanish: "Recommended Standard 232"), also known as EIA / TIA RS-232C, is an interface that designates a standard for the exchange of serial binary data between a DTE (Data Terminal Equipment, "Terminal Data Equipment"), such as a computer.