Re: Please explain why an RJ45 splitter won't work

On Mar 28, 5:29 pm, Robert Redelmeier <red...@xxxxxxxxxxxxxxx> wrote:
Albert Manfredi <bert22...@xxxxxxxxxxx> wrote in part:

When two computers are connected with a cross-over cable, you
can indeed get collisions. The point is, both computers can
detect the collision, because the Tx pair of one goes to the Rx
pair of the other. A computer would detect the collision when
it sees energy in its Rx pair, while at the same time it is
transmitting. So with two computers set up this way, no problem.

This is not a collision because no data gets mangled.  
This is just normal full duplex operation.

Or think of it this way. If multiple computers are connected via and
L2 switch, no data would ever "get mangled" either. And yet, if these
compouters are set up for half duplex operation with the switch,
collisions can occur.

When separate Tx and Rx pairs are uised in an Ethernet interface, half
duplex operation may simply mean that simultaneous use of the two
twisted pairs is not allowed. Even in cases where data would never get
mangled.

Bert
.

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