On 05/29/2014 10:09 AM, Jonathan Morton wrote:
>
> On 28 May 2014 20:31, "David Collier-Brown" <davec-b@rogers.com
> <mailto:davec-b@rogers.com>> wrote:
> > A niggle: people working in queuing theory* make the simplifying
> > assumption that queues don't drop. When describing the real world, they
> > talk of "defections", the scenario where a human arrives at the tail of
> > the queue and "defects", either to another queue or to the exit door of
> > the store!
>
> I think my description of the black box is still valid: a "defection"
> must imply a second output from the box, otherwise it will appear as
> either a reordering (preserving the property) or a discard.
>
> - Jonathan Morton
>
Yes, I entirely agree: your black box is slightly larger than the usual
queuing box... which make your box think  "outside the box" (;-))

--dave

-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb@spamcop.net           |                      -- Mark Twain