Re: Pipeline Production Problems

[Chris Albertson <chrisalbertson90278@yahoo.com>]

What's going on I think is he has one switch acting in effect like
a mulitplexer.  It takes data from three computers ech over it's
own cable and sends all this data over one cable to a second
switch that in effect acts like a de-multiplexer and routes the
data to each of three other computers.  The bottle neck is of
course the single cable interconnecting the two switches.

I I have described Tom's netwok topology corretly there is
no need to run any tests.  It is clear that the some of all
the transfers can not exceed 100Mbps and that the only second
transfer show up the bottle neck.

There is now way around it. he needs to either live with a
100Mbps link between the two physical locations or install
more bandwidth, with unaviodably means more physical cable
or if he is _extreamly lucky_ the existing cable run will
support 1000BaseT. but likey either more cable or fiber is
required.

Note that you can double a Cat5 cables bandwidth by useing
all four pairs to support two Ethernet runs. (looks ugly but
works)


--- Robert Creager <Robert_Creager@LogicalChaos.org> wrote:
> When grilled further on (Mon, 13 Oct 2003 22:47:27 -0700 (PDT)),
> Chris Albertson <chrisalbertson90278@yahoo.com> confessed:
> 
> > 
> > Rob,
> > 
> > I think you missed a post.  Tom has two switches daiy chained.
> > When any of the PCs on switch one need to send data to any of the
> > PCs on switch two the data must go over the uplink cable.
> > There is a 100Mbps bottle neck between the two switches.
> 
> I did miss that one, but I have 4 switches between the PII and the
> server
> mentioned previously.  And saw full bandwidth between those two
> computers.


> 
> > 
> > Looks like he has the Windows camera controlers all on one
> > switch and the data pipeine boxes on a second switch.  He needs
> > to buy one big switch and pull more wire or just put up with it.
> 
> I suspect one of them is really a hub then, not a switch.  I can try
> a slightly
> different test tonight.  I've three computers on one switch, and then
> the one
> out-lier.  This will test the speed of the switch with two different
> transfers
> going on between three ports.
> 
> Cheers,
> Rob
> 
> -- 
>  07:48:47 up 74 days, 15 min,  6 users,  load average: 2.11, 2.05,
> 2.01
> 

> ATTACHMENT part 2 application/pgp-signature 



=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org
  KG6OMK

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