RE: hubs and switches

[Frank Knobbe <frank () knobbe us>]

On Thu, 2004-08-05 at 14:41, Fulp, J.D. USA wrote:
> So... bottom line... if there is a "col" led (light-emitting diode) on
> the device, you can be 99% sure you've got a true "dumb" hub.

That is almost correct. If the device has a SINGLE Col LED, then indeed
the chances are very good that it is a hub. However, if it has a Col LED
for each port, then it is a switch.

I have an old LinkSys switch for example that has Lnk/Col LEDs in
addition to the FD/HD and 10/100 LEDs. 

So a single Col LED means single collision domain meaning it's a hub.
Multiple Col LEDs indicate multiple collision domains meaning it's a
switch.

Almost forgot... If you have two Col LEDs, then you have most likely a
dual-speed hub  ;)


Regards,
Frank

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