> But if you slow it down then the absolute amount of time before the error
> is exceeded is lengthned.

Yes, but the absolute time error is also lengthened by the same factor.

> Change your examples to a time scale by inverting:
>
> 300 bPS cell width: 3.3333 ms +- 0.3ms
> 115k bPS cell width: 0.00886805 mS +- 0.000256 ms
>
> There's several orders of magnitude more error available at the slower
speed
> before you get bit errors.

So what!?  3% is still 3%.  At the lower speed both the error and the error
tolerance are longer in absolute time.  A 5.88% speed error is still the
absolute upper limit regardless of bit rate.

The speed only matters if something is taking a finite amount of time per
bit, like the high to low transition of a gate.  The assumption here is that
we are using a slow enough bit rate so that these can be ignored, which is
certainly true at a few tens of thousands of bits/second.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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