That depends on what you are attempting to do. If you are trying to access the internet, then no, a wireless router is not needed.
If the access point has a wireless interface and if your laptop supports the wireless network type, no you do not need a router. <><><><><> If the laptop is not near enough to an access point, it will not be able to connect. The router is immaterial.
You will need to add a wireless access point to the wired network.
You need a WAP - WIreless Access Point. This is a bridge device that connects the two types of networks together. Or, use a router.
You need to check log files while logged in to your access point.
It's best to use a wireless access point whenever the cost of running Ethernet is either too expensive, or inapplicable to certain settings. For example, if you worked in an office building that had false ceilings, it would be somewhat easy to have someone come in and run Ethernet. However, if you worked in a warehouse that is constantly re-utilizing it's space, it is unlikely that running Ethernet would be a good investment. Thus a wireless access point, or several access points would be used instead.
The best thing to do is to set up a wireless router at your downstairs point and then access the Internet anywhere in the house from that. Presuming you have a laptop that has wireless access. Then you don't need to worry about the line going upstairs. Your PC at the point of access can still access the net direct via the line, so it doesn't need to have wireless. So just get yourself a wireless router.
The needed devices are wireless access point (WAP), a wireless router. You need computers with wireless networking adapters. And you need a "wired" connection to the internet for the router to plug into. Most people are able to install it themselves but your ISP will install it if you are more comfortable with that.
No, why would you? I suggest just buying a wireless PCI card for the two desktops. It would make life much more easier. You can, what you need is a wireless router... this will allow you to have approximatly 4 ethernet ports and wireless access to your network, but look in your manual to make sure you encrypt the data so as to protect from wireless predators...
I personally feel that I am getting everything I need out of my access point. I am very happy with my wireless plan and do not feel that it is necessary to change at the current time.
You'll need to purchase and install a "wireless adapter" for your computer -- and today the most popular ones are little "dongles" that plug into your USB port. You'd spend anywhere from about $30 to $80 for an adapter. One that is installed, you will need to connect to a wireless network -- which is either going to be in a Hotel, coffee shop, or at your home if you've installed a Wireless Router or an Access Point. The adapter in your PC will "associate" to an "Access Point" -- and the Access Point will put your signal onto the network so you can access resources and/or the Internet.
Wireless LAN Switches: The Best Solution There are two types of wireless access points Intelligent (Fat) and Thin wireless Access points. A fat wireless access point has everything it needs to handle wireless clients. A Thin wireless access point is basically a radio and antenna that is controlled by a wireless switch. If you deploy several Fat wireless access points they need to be configured individually. With thin wireless access points the entire configuration takes place at the switch saving you time and money. Wireless LAN Switches provide many benefits: Wireless Mobility - Intelligent access aren't managed in a central location which means there is no third party monitoring the movement of a user. If a user moves to another work area traditional wireless access points have a hard time passing off the user to the new access point. Thin wireless access points are controlled be the wireless LAN switch who will manage the users movement. Security- Using the wireless LAN switch the administrator can check logs, configure is security settings, make group polices for wireless users all in one spot. Also built in to many wireless LAN switches are RADIUS servers which will give another layer of security on top of your encryption policies. In enterprise wireless networks the administrators biggest fear is rogue wireless access points. Wireless LAN switches can detect when a new wireless access point comes into the area and decide if it is a trusted or non-trusted device. Placement - Power over Ethernet is another great feature of wireless LAN Switches. Power over Ethernet eliminates the need for an power outlet to be near the wireless access point. This saves your company money by not having to install new power outlets. Also this improves security by not having the wireless access points within easy reach of passerby's. If you are deploying a wireless LAN for a company I would be scared if you don't utilize wireless LAN switches and wireless thin access points. The upfront costs of these products are more but your total cost of ownership will be less than having to administer each wireless access point separately. To sum it up home owners should stick with Fat access points and businesses should use thin.