There is definitely confusion between these two terms when talking about NBN Broadband and your home or office Wi-Fi network.
Very simply put:
5G is mobile.
5GHz is on a Wi-Fi router.
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They really are a game changer now for homes that have poor Wi-Fi reach or stability with conventional routers.
If you need more explanation about 5G & 5GHz read on …
5G and 5GHz are both terms used for wireless connectivity or Wi-Fi, both are Radio Frequencies but they are not the same frequency. People often shorten the term 5GHz Wi-Fi to 5G which adds to some confusion especially when researching any health affects* of radio frequencies.
5GHz is a radio signal frequency. GHz stands for Giga Hertz (1,000 megahertz MHz).
5G is the mobile signal standard of radio frequency. The G stands for ‘Generation’. Before 5G there was 4G LTE and 3G.
Low-band 5G uses a similar frequency range as current 4G mobiles, 600 – 700 MHz. Low-band 5G will have a similar range and coverage area to current deployed 4G towers.
Mid-band 5G uses microwaves of 2.5-3.7 GHz. Each mobile tower providing service up to several Kms radius.
High-band 5G currently uses frequencies of 25 – 39 GHz, near the bottom of the millimeter wave band (mmWave).
* There is a fair amount of research – past and ongoing on the effects of non-ionising 5G and 5GHz Radio Frequencies.