It's extremely difficult to gauge foliage attenuation. It literally varies as the wind blows. Because of the wavelength, 5.8GHz also requires less fresnel zone clearance compared to 2.4GHz so if you were skimming the top of the trees on a marginal link, the blockage at 2.4GHz would be more severe, perhaps enough to dip you below the required signal-to-noise ratio.
If the trees were dense and the power ouput the same then 2.4GHz would win out.
Yes but you are free to use more power with 11a than 11g which balances out its weakness in solid object penetration. And the greater power enables better LOS distances which makes it superior for point-to-point fixed wireless usage. Overall 11a is better unless there happens to be a ton of inband interferrence or a PCS cell tower in the region which hits the 5.8GHz frequency range with a third harmonic.
There is virtually no difference between those two frequencies in terms of ability to penetrate objects. 2.4GHz would be superior but a much more important factor would be the amount of power used... or more specifically EIRP.
Let's not forget that there needs to be an untapped market to create/exploit in order for such growth to occur. If there were to be another Intel in some far off land, it wouldn't be making it's bones in CPUs. The PC revolution was a singular event.
We have to assume that there is a new field of this size with such growth potential. I doubt next-gen electronics will be nearly as explosive.
Bluetooth should be able to use AES encryption. The algorithm has never been cracked. In fact the only way AES has ever been beaten is through a side channel attack which requires crazy skills plus hands on access to the internals of both radios. Until someone beats AES, wireless is secure.
Unreferenced Fact: to beat AES through brute force it would take a machine attempting 255 keys a second 149 trillion years to crack the code.
If bits are encoded on a wave then wouldn't more waves (higher frequency) give the opportunity to encode more bits and therefore increase throughout? Assuming the same SNR?
VoIP has extremely small bandwidth requirements - something on the line of 25kbps IP bandwidth per stream. The main consideration is QoS. Getting the diffserv header in those packets marked as Voice 6 and enabling seamless roaming are what make everything run smoothly. Extra Mbps are meaningless until you hit the enterprise level. Even then you would really have to hammer your internal network and would still have to deal with your Internet bottleneck.
The US is declining in science and engineering because our schools are no longer fostering a competitive atmosphere. This last century has seen an explosion of scientific progress coupled with a fading of religious influence. We, as a country, were producing way more scientists when religion was a stronger everyday force so you can't blame it for today's shortfalls. Take a step back and look at the big picture, religion doesn't have a damn thing to do with it. Our public schools have become terribly inefficient fiscally and as a result scholastically noncompetitive. Keeping kids interested in learning challenging subjects will become more and more difficult until we find a way to fix our school systems - not our religious beliefs.
"is this really something new and bigger than before?"
This conflict is clearly new and bigger than before. When the VHS Betamax war went down, nobody knew that these "VCR thingies" would revolutionalize home entertainment. Video stores were smaller than 7-11s and had less movies than I have at home now. Now there is a multi-billion dollar industry at stake and everyone knows it. Plus the outcome could have a profound effect on who comes out on top of this round in the console gaming market. And the winner in that market will have successfully integrated the home computer with the living room. Why do you think MS has been willing to lose money consistently on the XBox? They are dying to get their greedy hands into our living rooms.
But who cares if you can fit a HD movie on a dual layer dvd? there will never be any hd content released for regular dvd players because they don't have the uptake bitrate to play it back right? If we want HD on a DVD, we are going to need to choose from blue-ray or hd-dvd.
FYI, last I heard PS2 had triple the installed base market share of XBox and over 95% in foreign markets so to say that XBox sales weren't that far below PS2 is a fallacy.
disclaimer: I'm shamelessly rooting for the XBox and despise Sony products
A future release of the XBox360 will have a hd-dvd player to counter the PS3 blue-ray. What I can't figure out is what took them so long to move on this.
Blue-ray is a massive gamble on Sony's part. If it becomes the standard, sales of PS3s will go through the roof and the XBox will fade to obscurity. Why Microsoft didn't buddy-up with Toshiba earlier is beyond me since the whole console gaming market is at stake. And now that people know there will be a bigger better XBox360 coming out nextgen, initial sales are going to suffer unless they can make the hd-dvd an upgrade feature but I haven't heard anything about it being a modular component.
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It's extremely difficult to gauge foliage attenuation. It literally varies as the wind blows. Because of the wavelength, 5.8GHz also requires less fresnel zone clearance compared to 2.4GHz so if you were skimming the top of the trees on a marginal link, the blockage at 2.4GHz would be more severe, perhaps enough to dip you below the required signal-to-noise ratio.
If the trees were dense and the power ouput the same then 2.4GHz would win out.
Yes but you are free to use more power with 11a than 11g which balances out its weakness in solid object penetration. And the greater power enables better LOS distances which makes it superior for point-to-point fixed wireless usage. Overall 11a is better unless there happens to be a ton of inband interferrence or a PCS cell tower in the region which hits the 5.8GHz frequency range with a third harmonic.
There is virtually no difference between those two frequencies in terms of ability to penetrate objects. 2.4GHz would be superior but a much more important factor would be the amount of power used... or more specifically EIRP.
Let's not forget that there needs to be an untapped market to create/exploit in order for such growth to occur. If there were to be another Intel in some far off land, it wouldn't be making it's bones in CPUs. The PC revolution was a singular event.
We have to assume that there is a new field of this size with such growth potential. I doubt next-gen electronics will be nearly as explosive.
He's right, it was the Greeks not the Chinese who used the pole.
Bluetooth should be able to use AES encryption. The algorithm has never been cracked. In fact the only way AES has ever been beaten is through a side channel attack which requires crazy skills plus hands on access to the internals of both radios. Until someone beats AES, wireless is secure.
Unreferenced Fact: to beat AES through brute force it would take a machine attempting 255 keys a second 149 trillion years to crack the code.
If bits are encoded on a wave then wouldn't more waves (higher frequency) give the opportunity to encode more bits and therefore increase throughout? Assuming the same SNR?
VoIP has extremely small bandwidth requirements - something on the line of 25kbps IP bandwidth per stream. The main consideration is QoS. Getting the diffserv header in those packets marked as Voice 6 and enabling seamless roaming are what make everything run smoothly. Extra Mbps are meaningless until you hit the enterprise level. Even then you would really have to hammer your internal network and would still have to deal with your Internet bottleneck.
The US is declining in science and engineering because our schools are no longer fostering a competitive atmosphere. This last century has seen an explosion of scientific progress coupled with a fading of religious influence. We, as a country, were producing way more scientists when religion was a stronger everyday force so you can't blame it for today's shortfalls. Take a step back and look at the big picture, religion doesn't have a damn thing to do with it. Our public schools have become terribly inefficient fiscally and as a result scholastically noncompetitive. Keeping kids interested in learning challenging subjects will become more and more difficult until we find a way to fix our school systems - not our religious beliefs.
"is this really something new and bigger than before?" This conflict is clearly new and bigger than before. When the VHS Betamax war went down, nobody knew that these "VCR thingies" would revolutionalize home entertainment. Video stores were smaller than 7-11s and had less movies than I have at home now. Now there is a multi-billion dollar industry at stake and everyone knows it. Plus the outcome could have a profound effect on who comes out on top of this round in the console gaming market. And the winner in that market will have successfully integrated the home computer with the living room. Why do you think MS has been willing to lose money consistently on the XBox? They are dying to get their greedy hands into our living rooms.
But who cares if you can fit a HD movie on a dual layer dvd? there will never be any hd content released for regular dvd players because they don't have the uptake bitrate to play it back right? If we want HD on a DVD, we are going to need to choose from blue-ray or hd-dvd. FYI, last I heard PS2 had triple the installed base market share of XBox and over 95% in foreign markets so to say that XBox sales weren't that far below PS2 is a fallacy.
disclaimer: I'm shamelessly rooting for the XBox and despise Sony products A future release of the XBox360 will have a hd-dvd player to counter the PS3 blue-ray. What I can't figure out is what took them so long to move on this. Blue-ray is a massive gamble on Sony's part. If it becomes the standard, sales of PS3s will go through the roof and the XBox will fade to obscurity. Why Microsoft didn't buddy-up with Toshiba earlier is beyond me since the whole console gaming market is at stake. And now that people know there will be a bigger better XBox360 coming out nextgen, initial sales are going to suffer unless they can make the hd-dvd an upgrade feature but I haven't heard anything about it being a modular component.