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DSLAM for your service, so the only people who can change the interleaving settings are the physical provider of your service.
The exception to this is the Cisco range of ADSL routers, where interleaving can be increased or reduced, if you have the enable password for the router.
Increasing latency by setting higher interleaving rates means your connection is less vulnerable to noise. Decreasing latency by decreasing interleaving may cause connection drops.
Recently, Covad is allowing ISPs to request Interleaving be disabled for their ADSL circuits, reducing ping time considerably. If you are not sure whether Interleaving is off for your ADSL line, contact your ISP and ask.
Also read About DSL for lots more information