RE: Kinda On Topic - network question

["Paul Gordon" <paul_gordon@xxxxxxx>]

Oh and of course one other thing that I forgot to mention - If you have a
switch, you can connect devices in full-duplex mode. This is not possible
with a hub. Thus you can potentially double the available LAN bandwith (i.e
on a 100MB LAN you can have 200MB/sec throughput between devices, as they
can be both transmitting and receiving simultaneously at full speed)

Paul G.





>From: "Steve Morgan" <steve@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: <ukha_d@xxxxxxx>
>Subject: RE: [ukha_d] Kinda On Topic - network question
>Date: Fri, 14 Sep 2001 06:59:20 +0100
>
>A hub is a fairly dumb device that effectively has all the ports
connected
>together all the time. Any traffic on ANY port appears at EVERY port,
so
>all
>devices on all ports are contending for the same bandwidth (10 or 100
>megabits per second, depending on the hub).
>
>A switch is rather more intelligent in that it can open multiple
>point-to-point pathways between ports and allow data to flow at full
speed
>along those separate paths. Traffic coming in on one port only appears
on
>other ports if that's where it was supposed to go.
>
>As an example, suppose you have 4 machines, A, B, C and D. With a hub,
if A
>and B are communicating at full speed, network performance will degrade
for
>machines C and D as well, because the network bandwidth is shared
between
>all the ports. Replacing the hub with a switch, A and B can continue to
>communicate at full speed without impacting on C or D since the traffic
>doesn't reach them. C and D can also now communicate at full speed and
the
>overall bandwidth has increased.
>
>With a hub, the maximum throughput is determined by the network speed
(10
>or
>100 Mbps). With a switch, the maximum _theoretical_ throughput is
>determined
>by the network speed * number of switch ports / 2.
>
>However, if you have multiple clients communicating with a single
server,
>as
>might be the case with a small network, performance will be constrained
>because there is contention at the server port.
>
>The biggest benefit will be realised upgrading your hub from 10Mbps to
>100Mbps.
>
>Hope that helps,
>Steve
>
> > -----Original Message-----
> > From: Jon Bhargava [mailto:jonathan.bhargava@xxxxxxx]
> > Sent: 13 September 2001 10:27
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] Kinda On Topic - network question
> >
> >
> > Hi
> >
> > I need to upgrade my old 8-port network hub to something faster
> > I have just seen a 16-port network 'switch' on the Scan site.
> > Please can somebody excuse my ignorance & tell me the
> > difference between a
> > hub & a switch?
> >
> > Many thanks
> >
> > Jon Bhargava
>
>
>
>For more information: http://www.automatedhome.co.uk
>Post message: ukha_d@xxxxxxx
>Subscribe:  ukha_d-subscribe@xxxxxxx
>Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
>List owner:  ukha_d-owner@xxxxxxx
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>


_________________________________________________________________