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No. You need to connect the ethernet cable to a modem or router. You can disconnect the PC ethernet cable from the modem and connect an ethernet cable from the Xbox 360 to the modem until you purchase a router.
You are supposed to connect an ethernet cable from the modem to whatever device that needs an online connection and if you have 2 or more items connect the router to the modem with an ethernet cable and then connect the devices to the router with ethernet cables
Ethernet
connect the cable modem to PC using the usb port, leaving you the ethernet porton on the cable modem to connect to the wireless router.
Usually with an ethernet cable
If you have a router the ethernet cable connects to it. If you have another item like a PC connected to a modem you could disconnect the ethernet cable from it and plug in the PS3 until you purchase a router.
Find a Broadband or DSL internet provider or if you already have one and are already using it connect a router to your modem. Then simple connect an ethernet cable from your modem to your router and one from your router to your PS3. The cable that was going from the modem to your computer now goes from your router to your computer. If you are not using the internet service before then just connect th ethernet cable from your new modem to the PS3. Then if you do get a computer just buy the router and the ethernet cables then.
No it can connect with a ethernet cable to your modem or router
First you must have an internet service provider and it then depends on what equipment they have provided. An ethernet cable will connect to a modem or a router and go to the device for a wired connection. I used a Cat 6 ethernet cable and a router to split the signal from my first cable modem to a router and then from my PS3 and PC connected 2 more ethernet cables to the back of the router. Later Comcast sent a gateway modem and that already had WiFi and more than one spot to plug in the ethernet cables and I put my router away
A PS3 has WiFi and you can put the router next to your modem. The only thing the back of a PS3 uses for the internet is for a wired connection with an ethernet cable to your router or modem instead of a WiFi connection
You connect you PS3 to the Modem to allow you access to the PlayStation Network with either an ethernet cable or a WiFi connection with a wireless modem or router
dsl cable router