ADSL Interleaving now disabled.

Forums › Spark New Zealand (including Skinny and BigPipe) › ADSL Interleaving now disabled.

wreck90

780 posts

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Inactive user

#61632 20-May-2010 10:02

Not only did my ping speed drop from 42ms to 23ms, my speed increased from around 17,000 to 21,000.....

From modem webpage....

'''Current DSL Connection: '''

Down Up
Rate:
21209 kbs
752 kbs
Max Rate:
21209 kbs
840 kbs

And , from speedtest...

Nice, thanks telecom.

NZCoderGuy

513 posts

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Kiwi Dev Studios

#332146 20-May-2010 10:10

I've never understood what Interleaving actually is, nor what is actually does.. anyone want to enlighten me?

--
Stephen
twitter/ NZCoderGuy / KiwiDevStudios

wreck90

780 posts

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Inactive user

#332148 20-May-2010 10:12

gtxboyracer: I've never understood what Interleaving actually is, nor what is actually does.. anyone want to enlighten me?

It is an error correction function. Useful for poorer quality lines.

But, because of the extra processing, your ping and line speeds decrease.

Buttonmash

361 posts

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#332222 20-May-2010 11:11

Chops packets over several to improve error checking, which increases your latency.

l43a2

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#332311 20-May-2010 13:01

wreck90: Not only did my ping speed drop from 42ms to 23ms, my speed increased from around 17,000 to 21,000.....

From modem webpage....

'''Current DSL Connection: '''

Down Up
Rate:
21209 kbs
752 kbs
Max Rate:
21209 kbs
840 kbs

And , from speedtest...

Nice, thanks telecom.

looks good :)

cyril7

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Subscriber

#332328 20-May-2010 13:22

To be a little more informative, interleaving is when a length of data (interleaving depth) is cued up, then broken in to sub sections, the sub sections are then re ordered, a bit like shuffling a pack of cards, but in a known sequence. This whole length of data is then sent.

At the receiving end the shuffling of the subsections is reversed so you end up with the original length of data, but to do this the whole sequency length must be recieved then unshuffled, this results in a delay.

The idea is that if a burst of noise impacts on that length of data then its impact is now scattered across the length of data stream rather than all in one part of the data stream. This makes it easier for other error correction schemes that are also to follow this process (in particular convolutional coding that uses a Viterbi Forward error corrector) to work correctly, ie they deal better with little bits of noise over a bigger area or length, than a large single section of data thats damaged.

Hope this helps
Cyril