Routers in 5GHz only mode are not compatible with the PlayStation 3. The vast majority of routers operate on 2.4GHz. The PlayStation 3 operates on 802.11 b/g/n 2.4GHz networks and won't be able to find your network if your router is set to operate in 5GHz only mode.
Oct 15, 2011 PlayStation 3 technical specifications - Wikipedia Using Bluetooth, the PlayStation 3 BD Remote allows users to control videos and music on Blu-ray Disc and DVD. In Japan, the device was available starting December 7, 2006. The PS3 will accept signals only via its Bluetooth Remote, as the console does not have an infrared receiver; this prevents the use of universal remotes with the Does a PS4 have built-in Wi-Fi? - Quora The short answer is ‘Yes, the PS4 console does have built-in WiFi.’ If you want to find out only this, then you got the answer and if you want to know more about the upgraded wireless capabilities of the PlayStation 4, then read on. Just like the
A wireless connection on the PlayStation 3 allows for game and movie downloads, internet surfing and online play. There is no need to use an Ethernet cable to get started. Depending on the model of the PlayStation and the type of wireless router you have, the setup can be a little different.
How to make the audio settings on your PlayStation 3 Sep 16, 2013 Sony PlayStation 3 Specs - CNET
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PlayStation 3 technical specifications - Wikipedia