[Gllug] Calculating 'real' bandwidth

[John Hearns]

Dylan wrote:
> Hi All,
> 
> A friend of mine wants to know what the maximum useful bandwidth of his 8meg 
> ADSL line should be. I've explained that it's a theoretical maximum including 
> transport overheads, and that the 8meg figure is decimal. But I can't for the 
> life of me work out what that should equate to in the binary kilobits or 
> kilobytes speed reported by his network monitoring app, taking in to account 
> the overheads.

As someone who still likes ATM networking, I should whistle and look 
innocent and not mention ATM cell tax.
http://www.utstar.com/Document_Library/WP_ATMCellTax.pdf

I'm assuming that all of the UK ADSL traffic is still PPP over ATM.
Is PPP over Ethernet more common now?
http://www.cisco.com/en/US/tech/tk175/tk819/tsd_technology_support_protocol_home.html
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