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What is Li-Fi?

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds.With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.The term Li-Fi was coined by University of Edinburgh Professor Harald Haas during a TED Talk in 2011. Haas envisioned light bulbs that could act as wireless routers.Subsequently, in 2012 after four years of research, Haas set up company pureLiFi with the aim ‘to be the world leader in Visible Light Communications technology’.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves.

As we now know, Li-Fi is a Visible Light Communications (VLC) system. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into ‘streamable’ content.An LED light bulb is a semiconductor light source meaning that the constant current of electricity supplied to an LED light bulb can be dipped and dimmed, up and down at extremely high speeds, without being visible to the human eye.

For example, data is fed into an LED light bulb (with signal processing technology), it then sends data (embedded in its beam) at rapid speeds to the photo-detector (photodiode).

The tiny changes in the rapid dimming of LED bulbs is then converted by the ‘receiver’ into electrical signal.

The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

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Wi-Fi 6 explained

The introduction of Wi-Fi 6 ushers in a new era of Wi-Fi codes. With the new Wi-Fi codes from Wi-Fi Alliance, it will be easy for the layman to understand Wi-Fi updates when labeled 6, 7, 8, etc. compared with 802.11ax.

 

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Cum dezactivați iMessages pe Mac

Aplicația Mesaje de pe Mac funcționează exact ca omologul său iPhone și iPad, permițându-vă să trimiteți iMessages către alte dispozitive Apple. Dacă preferați să mențineți mesajele separate, puteți dezactiva Mesaje pe macOS urmând aceste instrucțiuni.

Aceste instrucțiuni vor funcționa pentru Catalina, dar puteți găsi pașii diferiți pentru versiunile mai vechi de macOS. Aceasta va dezactiva doar mesajele iMessages și SMS (dacă aveți un iPhone) pe Mac, dar puteți dezactiva și iMessage pe un iPhone sau iPad dacă doriți.

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Do Not Disturb(DnD) While Driving on iPhone

Do Not Disturb has some variant modes, such as Do Not Disturb During Bedtime in the iOS 12 update. But the most famous is the version introduced in iOS 11 to reduce distractions when driving. It blocks incoming notifications (but you can set an automated reply for selected contacts only along the lines of “I’m driving right now, will get back to you in a bit”) and blocks phone calls too, unless you’ve got a hands-free kit.

  • Go to Settings > Do Not Disturb and then, under Do Not Disturb While Driving, tap Activate.

You’ll see there are three settings: Automatically (which attempts to work out when you’re driving by your motion, and which we wouldn’t recommend, given how many times we’ve seen this activate on trains), When Connected to Car Bluetooth, and Manually. Choose whichever option suits you.

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