On 27 Jun 00 at 11:55, Systems Administrator wrote:
> could somebody explain to me as if i where a small kid why we need to use
> a cross cable when we stack hubs? a mathematical explanation? thanks
> guys.
Simple....
A network card has pins 1 and 2 for transmitting and pins 3 and 6 for
receiving, while a hub has pins 1 and 2 for receiving and pins 3 and 6 for
transmission. When we connect a network card to a hub, a straight through
cable is ok. When you connect two network cards together (w/o a hub) you need
a cross connect. The same is through for hub to hub connection.
Except that some hubs have the MDI/MDI-X switch, in which case, you don't need
a cross connect cable if you toggle this switch (on one of the hubs).
-
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