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Possible Drawbacks with Wireless
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Not everything with wireless data is perfect (same for wireline) Occasionally, there will be problems that must be overcome The use of wired facilities has improved over the years with the use of fiber optics in the backbone Newer technologies have allowed the industry to improve performance of data to a 10 15 10 16 bit error rate This was unheard of before the use of fiber and SONET in the backbone The local loop (last mile) is the weakest link in the equation, producing bit error rates of 10 6 Still, today this is not as bad as it may sound because the distances we run on copper (the local loop) are being shortened daily The shorter the copper, the better the performance we achieve (because the weakest link is minimized, and the cables are correctable) Therefore, we see improved data performances on the local copper-data transmission systems However, wireless (air interfaces) have been traditionally error prone, and the amount of frequencies available have always been limited This interface is limited to the point that many people did not want to use air interfaces in the past With the culture shift and the use of digital techniques to compound the data, air became much more acceptable The wireless medium is also prone to more delay and latency than the wired world In the wired arena, the average delay for transmitting information across the nation networks is 50 msec or less In the wired world, this delay can jump to more than 250 msec At 250 msec, we find that echo begins to get out of control, requiring more equipment to handle this problem However, while handling the echo control function, we introduce more latency and buffering of the real data This almost becomes a Catch 22 problem The more the data is buffered and manipulated across the medium, the greater the risks of introducing errors
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Pros and Cons to Wireless
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Some of the inherent problems bring other solutions and benefits to the table For example, when using a wireless interface, the user is mobile and can go almost anywhere at whim This allows more flexibility However, the downside is that the use of cellular and PCS systems causes data and call handover to occur, which can be detrimental to the overall performance Security issues cannot be ignored with data in the air On a copper cable, data is slightly more secure because the medium is a little more difficult The use of an interceptor in the airwaves is much simpler Digital cellular and PCS make the data more secure than analog, but one still has to be concerned with putting anything in the airwaves From the perspective of financial information, the wireless data can be very expensive In the circuit-switched arena, just as in voice, we pay the carrier a flat rate for a guaranteed amount of usage The price is fixed whether you use the minutes or not If you exceed the minutes of usage, you pay a premium added cost for the overage usage Some plans do allow you to pay for only what you use; however, these plans tend to be at a higher cost per minute for all the minutes of usage Therefore, it becomes difficult to assess the best deal, depending on variable usage Packet switched data, such as CDPD and RAM Mobile data services, can be less expensive when small amounts of data are transferred Yet, if the user transmits large and lengthy files, the cost of packet switched data can be as much as 500 100% higher than circuit-switched data The variables are still less attractive to use the wireless data Other areas where differences exist are in the devices themselves When dealing with a radio interface (like a cell phone), we have to be aware of the battery life of the device Power consumption with lengthy data transfers can be critical The use of the overall battery life is contingent upon the technology used, but current industry standards allow for 2 4 hours of talk time on a portable device (transmission time for data) Anything over that is prone to cut off and produce errors The digital sets are better equipped to handle the data transfers, but dual mode phones can be problematic when they are in analog mode
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