Erlang?

[Alex Fraser]

    Well generally to start anyway. Seems it might be a good tool to explain
what happens in disaster communication situations.  I have not seen any
descriptions of 9-11 from a point of view of channel capacity, all services
included.
    Would Erlangs now be considered part of information theory?

Richard Barth wrote:

> Alex,
>
> If I don't misunderstand your question, you're asking about Erlangs
> generally rather than specifically about their use in radio channels.
>
> As pointed out on the web site whose URL you gave, erlangs were
> first created for use in the telephone biz.  The idea was that if there
> are 100 people in town A and 100 in town B, you don't need 100 lines in
> the trunk between the two because chances are they won't all be talking
> from one town to the other at the same time.  How many do you need?  You
> can look count the amount of actual traffic during the busiest hour and
> decide how much risk you will accept that during some future busy hour
> callers will get busy signals, and also decide how long you want a user
> to wait before his call goes through.  Then you use the models.
>
> The theory is useful anyplace you have a bunch of people waiting to use
> a limited resource: telephone trunks, microwave channels, paging systems
> and, as pointed out earlier, bank clerks.
>
> Another way of measuring traffic density is in hundreds of call seconds,
> or ccs.  You'll find this in the literature as well.
>
> 73,
>
> Dick
>
> Bob Bruhns wrote:
> >
> > Hi Alex,
> >
> > I saw Erlang analysis used in the paging industry, to quantify the
> > probability of congestion.  In paging, congestion is deadly because
> > if the system is clogged and pages are delayed in a que, users will
> > start resending en-masse, and the system will REALLY choke.  I saw a
> > 12% increase in system capacity result in the elimination of 20
> > minute (!) paging delays on Friday evenings.
> >
> > It was very confusing to do any kind of system test in those
> > conditions, if you did not realize what was happening.  One Friday
> > evening I was trying to get the TDD system working.  I was trying
> > different configurations, but test pages did not come through, so I
> > thought the configurations were wrong.  Then about a half hour
> > later, the first of the test pages started coming through!  Geez.
> >
> >   Bob
> >
> > ----- Original Message -----
> > From: "Alex Fraser" <beatnic@comcast.net>
> > To: <tacos@amrad.org>
> > Sent: Friday, May 17, 2002 11:26 AM
> > Subject: Erlang?
> >
> > > Are Erlangs ever used in radio channel analysis? It is new to me.
> > >
> > >  http://www.erlang.com/whatis.html
> >
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--
>>>>>>>>>>>>>>>>----<<<<<<<<<<<<<<<<<
........ Alex Fraser  N3DER .........
......... beatnic@comcast.net .......
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