Older router, putting out a very slow wireless signal.

I am using a BEF11S4 ver. 4 wirelss (b) router. I have a cable modem and service from Cox Communications. My desktop, which is plugged into the router via ethernet, receives around 1.2 Mbps, which is what the cable company promises. However, the wireless router puts on only 215 kpbs to my laptop.
I called linksys, and was advised to update the driver, which I have done. Any further advice from them will be costly. What else do I need to do to make the router deliver a decent wireless bandwidth?
Thank you very much for any suggestions.
Aashish.

Hi,
               Do the following setting to ressolve ur issue !
Click on the Wireless tab
Click on Advanced Wireless settings.
Change the Beacon Interval to 50
Change the Fragmentation Threshold to 2304.
Change the RTS Threshold to 2304
Click on save settings. 
Network Security Administrator (EC Council)
linksysfirmwares.googlepages.com/

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    If the above does not fix your problem, download and install the latest driver for your wireless card.
    If you still have trouble, try the following:
    For wireless g routers, try setting the "Transmission Rate" to 54 Mbps. For wireless n routers, try setting the "n Transmission Rate" to 162 Mbps, and the (wireless g) "Transmission Rate" to 54 Mbps.
    Hope this helps.

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