Cable broadband at 100Mbps coming soon to Asutralia (1 Viewer)

[HotShot]

dude there cable speed at 20Mbps just search google, nbut the problem most computers cant handle it.

 

[...]

dude there cable speed at 20Mbps just search google, nbut the problem most computers cant handle it.

you are an idiot

we asked for proofs, not where you googled

 

[Frigid]

wouldn't internet bandwidth increase to a point where it's faster than the harddrive read/write capacity?

 

[MedNez]

Indeed, that too, may be a problem. Some cable modems connect to the computer through USB1.1/2 , also. This is a speed limitation in data transfer too.

 

[SashatheMan]

Indeed, that too, may be a problem. Some cable modems connect to the computer through USB1.1/2 , also. This is a speed limitation in data transfer too.

thats true i did optus speed test with a USB wire and got around 5MBs but with a ethernet wire i got arouind 15MBs. much greater then 10

 

[Not-That-Bright]

You guys obviously don't have a raptor drive in ur computer.

 

[SashatheMan]

You guys obviously don't have a raptor drive in ur computer.

dinosaur drive?

 

[Not-That-Bright]

=/ ok????????

 

[Templar]

Raptors aren't that much faster than your average SATA hard disks, and aren't really worth the cost.

 

[sunny]

dude there cable speed at 20Mbps just search google, nbut the problem most computers cant handle it.

Hard disks and IDE drives offer 66/100/133Mbps, ethernet offers 100Mbps, gigabit ethernet offers 1000Mbps, AGP and PCIe offer several gigabits/s. You're telling me computers can't handle 20Mbps?

Saying cable is unlimited is like saying that you have a 1mm wide water pipe - but you can fit an unlimited amount of water through it at any instant - there is a physical limit to how many bandwidth a given medium can hold - broadband is not "unlimited"

 

[velox]

Raptors aren't that much faster than your average SATA hard disks, and aren't really worth the cost.

yes they are, and most people who own them have them in raid 1/0

 

[HotShot]

dude it is unlimited, its like today cable is 'limited' to 10Mbps but tomorrow its 'limited' to 20 Mbps, therefore it is unlimited. Proof? where is the proof that is its limited? i havent seen it?

 

[jm1234567890]

dude it is unlimited, its like today cable is 'limited' to 10Mbps but tomorrow its 'limited' to 20 Mbps, therefore it is unlimited. Proof? where is the proof that is its limited? i havent seen it?

That maybe true. I haven't read any research on whether there is a physical limit to the bandwidth of a medium.

But, with any currently known medium, attenuation increases with frequency. To have more raw bandwidth you need higher frequency levels. eg. 10Ghz-11Ghz is alot more bandwidth than 10Hz-11Hz. This also reduces the distance the data can be sent. Though with new modulation/compression techniques this bandwidth is being used to send more data.

 

[sunny]

That maybe true. I haven't read any research on whether there is a physical limit to the bandwidth of a medium.

Yes there is. I do not know the mathematics behind the maximum theoretical bandwidth, but the maximum theoretical error free data rate is given by a formula called Shannon's Law, which if I remember right is C = B log2 (1+S/N), where B is the maximum theoretical bandwidth and S/N the signal-to-noise ratio (SNR), and C is the max error free data rate.

dude it is unlimited, its like today cable is 'limited' to 10Mbps but tomorrow its 'limited' to 20 Mbps, therefore it is unlimited

*shakes head*
You might as well say, since microprocessors based on silicon are doubling in core frequency every 18 months (like Moore's law says) it should therefore continue down this road until we get to an infinitely high clock speed. Obviously this is ridiculous - using silicon for microprocessors is reaching the end of its life. Its almost as ridiculous as saying cable is unlimited in speed.

Proof? where is the proof that is its limited? i havent seen it?

See above for Shannon's Law. Need a simpler proof? Basic physics and network concepts. Frequency division multiplexing requires the overall frequency spectrum to be divided into smaller parts for different purposes and uses. There is only a finite number of divisions that can be made. Time division multiplexing requires the entire frequency spectrum to be cut up into time slices, which can only be cut up into a finite number of slices. Added to that, no conductor is perfect, and coax cable is one of them - there will be losses along the wire due to interference, signal and phase distortion (quality of the dielectric material), skin effect of electricity, just to name a few.

Where is the proof that its unlimited? I haven't seen it?

Please, at least think about what you say before you make ridiculous claims.

 

[jm1234567890]

Yes there is. I do not know the mathematics behind the maximum theoretical bandwidth, but the maximum theoretical error free data rate is given by a formula called Shannon's Law, which if I remember right is C = B log2 (1+S/N), where B is the maximum theoretical bandwidth and S/N the signal-to-noise ratio (SNR), and C is the max error free data rate.

oh yeah... I think we briefly touched on that last year.

But that is only the raw bandwidth. Is there any limit to the compression that can be achieved? I guess though there is a limit since you can't represent a gigabyte with a single bit, although that would be nice

 

[sunny]

oh yeah... I think we briefly touched on that last year.

But that is only the raw bandwidth. Is there any limit to the compression that can be achieved? I guess though there is a limit since you can't represent a gigabyte with a single bit, although that would be nice

I don't know if this is absolute, but I'm pretty sure the optimal lossless compression algorithm that exists is Huffman's encoding. But I may be wrong here.

 

[Shuter]

Yes there is. I do not know the mathematics behind the maximum theoretical bandwidth, but the maximum theoretical error free data rate is given by a formula called Shannon's Law, which if I remember right is C = B log2 (1+S/N), where B is the maximum theoretical bandwidth and S/N the signal-to-noise ratio (SNR), and C is the max error free data rate.


*shakes head*
You might as well say, since microprocessors based on silicon are doubling in core frequency every 18 months (like Moore's law says) it should therefore continue down this road until we get to an infinitely high clock speed. Obviously this is ridiculous - using silicon for microprocessors is reaching the end of its life. Its almost as ridiculous as saying cable is unlimited in speed.


See above for Shannon's Law. Need a simpler proof? Basic physics and network concepts. Frequency division multiplexing requires the overall frequency spectrum to be divided into smaller parts for different purposes and uses. There is only a finite number of divisions that can be made. Time division multiplexing requires the entire frequency spectrum to be cut up into time slices, which can only be cut up into a finite number of slices. Added to that, no conductor is perfect, and coax cable is one of them - there will be losses along the wire due to interference, signal and phase distortion (quality of the dielectric material), skin effect of electricity, just to name a few.

Where is the proof that its unlimited? I haven't seen it?

Please, at least think about what you say before you make ridiculous claims.

You didn't explain where the B came from in that equaltion though, and if you were reffering to that in your last statement, then we are still nowhere near the absolute theoretical limit of frequency divisions.

 

[sunny]

You didn't explain where the B came from in that equaltion though

I do not know the mathematics behind the maximum theoretical bandwidth

which if I remember right is C = B log2 (1+S/N), where B is the maximum theoretical bandwidth

The fact that this number exists in Shannon's Law already confirms that there is a theoretical maximum bandwidth to any given medium - otherwise we would just be substituting infinity into that equation everytime.

 

[Shuter]

Obviously there is an finite restriction for a each individual cable at a certain point, but if that point is so far away (i.e. tends to infinity) then therefore the potential speeds to us now would be "virtually" unlimited.

e.g. you can fit a virtually unlimited amount of water through a strong but thin pipe. It just has to be pumped at a faster and faster rate, untill such times as the friction of the particles would slow it down from going any faster. The limiting factor in that instance however would primarily be that we don't have pumps capable of moving it that rediculously quick such that it will start hitting the partical friction limit, not the partical friction limit itself. The same analagy could be applied to copper wires, in that it has a theoretical limit so far in excess of what we're using now, it's just we haven't got efffective enough modems to be able to sucessfully push that much amount of data through. The limit is in our transmission and receiving algorithems, not in the absolute theoretical frequency divisions limit of the wire.


Anyway, just some food for thought.

 

[redslert]

dude it is unlimited, its like today cable is 'limited' to 10Mbps but tomorrow its 'limited' to 20 Mbps, therefore it is unlimited. Proof? where is the proof that is its limited? i havent seen it?

keep digging that hole mate....
just drop it and don't reply back in this thread again nor make up crap which you can't backup