Although usermacs ping is high, I'd certainly assume that he is on FAST path,
1) That's what his router is reporting. FAST path is not capable of transmitting interleaved data.
Basically there are 2 different bearer channels down which data can be transmitted (FAST or Interleaved). The interleaved channel is capable of simulating fast but not vice versa.
2) He is syncing at a full 8128 on G.992.1 (g.DMT) . Usually interleaved adsl1 connections sync at 7616.
There are some exceptions to this ie account type is adslmax but the EU is attached to an adsl2+ capable MSAN.
3) Interleaving only occurs between the modem and DSLAM. The modem contains an interleaver/de interleaver, as does the DSLAM/MSAN.
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FTTC always uses the Interleaved Path for data transmission. However, interleaved depth=1 is the equivalent of Fast Path as data is sent contigously without any chopping up and re-arranging of the data stream.
Im on FTTC with an Interleaved depth of 1
I'm also up in the NW, so you'd expect my latency to be slightly higher than someone living near to London. That said Im now on an MSE bRAS which is supposed to shave a 1or2ms from latency due to MSE bRAS's being nearer to local exchanges and can hop onto the core quicker whilst there are only a limited number of the old style bRAS's dotted around the UK.
Faster speed doesnt mean that you will get less latency. Latency is the measure of how long it takes a single packet to get from A -> B. The higher speeds dont decrease latency, you are just able to send more packets at once.
Over the years Ive been on 512k, 2Mb, 8Mb, 24Mb and 80Mb and its always taken me circa 14ms to get to London. Its only since my exchange moved to MSE bRAS last Oct that my latency to London reduced to 12/13ms.
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My trace to 185.16.86.18 is in
this post and as you can see its 12ms.
Another thought occurred - what about BT Fon