[Hidden-tech] Network question

[matt lampiasi]

That's interesting that 1000BaseT uses all 8 wires didn't know that. 
fortunately haven't had to make any cables in a few years. ;)

Matt
On 12/1/11 10:59 AM, Tom Kopec wrote:
> just to clear (or muddy) the waters on some technical details.
>
> 1) gigabit ethernet uses all four pairs; 10M and 100M ethernet 
> generally use fewer pairs.
> 2)ethernet hubs are 'bad', because when you have hubs you can have 
> collisions and backoffs. Hubs can multiply the effect of a bad cable. 
> any modern ethernet switch, however, will never have a collision on 
> any port.
> 3) a bad cable can raise heck, because it may 'kind of' work. In some 
> of my work, we push ethernet to its limits, and I've had to deal with 
> the bizarro effects of bad cables more often than you'd believe.
> 4) Matt is dead on as to process: start from the uplink and work 
> backwards, and ditch any hubs. Be careful when measuring throughput 
> that there is no other traffic.
>
> ...tom