How does fastpath and interleaving effect the sync speed with regards to an ADSL, ADSL2 and ADSL2+ connection?
I know that latency may increase and that stabilty may increase stabilty when switching from fast path to interleaved, is this achieved my lowering the sync speed of line?
No it's achieved by transmitting extra redundant data that the router uses to fix errors in the data stream without having to request a re-transmit. It's called forward error correction, FEC.
On ADSL Max the typical maximum sync rates are 8128kbps for fast path and 7616kbps for interleaved. That indicates the the interleave process grabs of the order of 512kbps of sync. If you are lucky with the combination of home/exchange modems you can sync at 8128kbps on interleaved.
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A crucial point Badboy has missed (made obvious by the fact its called Interleaved) is that data is sent to your modem in non-contigious segments. Data is buffered by the sender and re-ordered. Your modem then needs to spend time re-ordering the data into its original sequence before passing it for routing.
It should also be pointed out that whilst BTw state that applying interleaving shouldn't reduce your line speed, it does reduce the maximum line rate achievable from 8128kbps to 7616kbps due to the additional overhead required for check bytes.
On clients sync I haven't noticed a change is sync-rate when enabling/disabling interleaving on their line, however I have yet to change it from Auto on a line that is at 7000+ sync.
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