depends if ur ps3 has wifi mine doesnt so then u need the cable otherwise just connect to wifi and start playing
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No it can connect with a ethernet cable to your modem or router
If the hotel has broadband WiFi you don't need the computer just use the PS3 WiFi connection and if it has Ethernet then plug the Ethernet cable in your PS3.
To connect to the Internet without Wi-Fi on your Xbox 360, you will need an Ethernet cable. Simple connect one end of the cable to the rear of the console and the other end to the router.
You must have a Cable or DSL service provider and the hardware to connect with WIFI or ethernet cable. Then it is just a matter of setting for the PS3 see related link
Any broadband should be fine, you don't need a special ps3 broadband. You can connect wirelessly via the inbuilt wifi or with an ethernet cable to a router.