400 Mbps ADSL

isn't old already can already been done for a while now, and it's expensive
 
Someone wanna do the maths on how much this would cost us using 4mb lines?

Somewhere in the region of R60k a month, excluding cap?
 
It is quite sad when people outside of deep dark africa are talking about bonding 400MB Adsl lines. when we are bonding 20MB lines. Man I feel even more int he dark ages now.
 
wow 400Mb/s
we can't even get 4Mb/s correct here... :rolleyes:
 
“It reuses the existing wireline network infrastructure to provide a 400Mbps resilient packet ring”
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So first we need to get an infrastructure....
 
Telkom does not even has that type of bandwidth between exchanges in some cases. But they have enough dark fibre to enable much better access.
 
lilGr said:
400 Mb/s = 44 MB/s = 1 Meg per 23 ms

3GB Cap will last 68.181818 seconds :)
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Close, but not quite. How often do you reach 48KBps on a 384 line or 512 on a 4Mb line? The mean (statistically) speed achieved on an ADSL line is 83% of capacity, ie a 384 line will peak at 40KBps and a 4Mb line at 425KBps, although higher speeds are obtained now and then due to spikes and cached data somewhere along the line.

Thus a 400Mbps line is theoretically capable of 41.5MBps (down, up is not taken into consideration at all, since I have no data for it) and a 3GB cap (with maximum theoretical speed at 83% used at all times) will last 74 seconds if there is no upload. On a 40KBps download you usually have 1.5KBps upload (packet checking and handshakes), so in actual fact a 400Mbps line will do a theoretical 43.06MBps transfer for http. ~~71.89 seconds.

But take this as it is, since there are obviously other factors involved such as connection times and other speed fluctuations.
 
Yes it's around 82% or 83% of the total line speed, so how on earth can a 400Mbps only get a max of 41Mbps? Theoretically, it should get around 332Mbps.
 
mercurial said:
Yes it's around 82% or 83% of the total line speed, so how on earth can a 400Mbps only get a max of 41Mbps? Theoretically, it should get around 332Mbps.
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MBps .... megabytes per second. 400Mbps is equald to 400 megabits per second -> 50 megabytes per second.
 
froot said:
Close, but not quite. How often do you reach 48KBps on a 384 line or 512 on a 4Mb line? The mean (statistically) speed achieved on an ADSL line is 83% of capacity, ie a 384 line will peak at 40KBps and a 4Mb line at 425KBps, although higher speeds are obtained now and then due to spikes and cached data somewhere along the line.

Thus a 400Mbps line is theoretically capable of 41.5MBps (down, up is not taken into consideration at all, since I have no data for it) and a 3GB cap (with maximum theoretical speed at 83% used at all times) will last 74 seconds if there is no upload. On a 40KBps download you usually have 1.5KBps upload (packet checking and handshakes), so in actual fact a 400Mbps line will do a theoretical 43.06MBps transfer for http. ~~71.89 seconds.

But take this as it is, since there are obviously other factors involved such as connection times and other speed fluctuations.
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what ever happened to simple maths? :p How did you get the 83% max used all the time?

Edit: lets say "bytes" and "bits" instead of B and b to stop confusion.
 
Thats is fast!!! But would it really be of much help to everyday people like me and you? Surely we must stop somewhere?
 
eltherza said:
what ever happened to simple maths? :p How did you get the 83% max used all the time?

Edit: lets say "bytes" and "bits" instead of B and b to stop confusion.
Click to expand...

1. There is no such thing as simple maths.
2. 83% is both from personal experience on several linespeeds, locations, ISPs, and from othersources.
3.There is no confusion. Anyone who has even a little knowledge about it can tell Mbps and MBps apart.
 
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