Difference between revisions of "Interleaving"

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1 byte removed ,  20:44, 23 March 2015
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==More about interleaving==
[[File:Interleaving.png|none|frame|This line dropped shortly after 11am, and reconnected with higher latency. This could be interleaving being applied]]
On broadband lines there is a key factor that affects the latency. Lines use a technique called Forward Error Correction which allows small errors in the signal to be corrected without having to resend the data. This only works for small errors (e.g. one bit), but sometimes lines have interference (called Impulse Noise) which affects lots of bits at a time (a click or pop on the line, in effect). To fix this a technique called interleaving is used. It spreads each packet out over a longer time, interleaving it with other packets. When there is impulse noise the effect is a small error in a whole series of packets, each of which can be corrected.
 
 
There is often one other option, which is running the line at a lower speed. This can remove the interference if it is only at certain frequencies, and as we explained above, the speed is not necessarily a key factor.
 
[[File:Interleaving.png|none|frame|This line dropped shortly after 11am, and reconnected with higher latency. This could be interleaving being applied]]
 
== TalkTalk lines ==

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