[c-nsp] atm ubr settings?

[goemon at anime.net]

On Mon, 3 Apr 2006, Roy wrote:
> It may be a bad idea.  The UBR setting should not exceed the speed of
> the lowest physical link in the PVC.  In my case, we have a 44 Mbps ATM
> pipe feeding many DSL customers.    Too high a setting for the UBR
> results in cell drop at the DSLAM and really lousy performance.

Any authoritative source saying it is absolutely a bad idea? Anything I 
can cite which is definitive on the matter?

-Dan