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How much does a brick wall reduce wifi range?

If a wifi transmittor from an omni antenna has a 50meter range, how much might that be reduced by a brick wall in that direction.

I mean would it reduce it to say 30meters the other side of the wall, or not that much?

Can you force any wireless a/b/g router to transmit only on 802.11a (eg to reduce 2.4ghz phone interference)?

I do not have a wireless router yet, have an ABG laptop and 2.4ghz cordless phones. I have a small distance between where the router will be placed and the laptop, so I’m not too worried about range. I just want to use the 802.11a bandwidth. I wonder if it is user-selectable [...]

Does wireless security reduce connection speed?

After I made my router’s security set to WPA2 my connection is now slower. Does anybody have an idea what the problem is?
what’s an MTU?

Ways to Cost Analyze and Reduce Telecommunication Expense

Cost analysis is a must for all operations of a business.  Expenses incurred due to telecommunication service charges require a considerable budget allocation and hence have to be analyzed with care to minimize cost.  The first step in the analysis will be to consolidate all the voice and data services used, and then to analyze [...]

8 Quick Ways to Reduce Local Phone Service Charges

Despite all the new and emerging business communications technologies of the 21st century (VoIP, Wi-Fi, Wi-Max, Bluetooth, cell phones, blackberries, etc.) the majority of companies in business today still write a check each and every month to a local exchange carrier for a 125 yr. old technology – local phone service – (sometimes referred to [...]