From: André Bersvendsen (an-bersv@xxxxxxxxx)
Date: Tue Jul 23 2002 - 05:08:55 GMT-3
Hi,
We all agree that a TP connection must be crossed to establish a
connection. Tx must go to Rx at the other device and vice versa.
If the cable is not crossed one of the ports must be crossed. And if the
port is crossed it is often marked with a X. On a Catalyst switch the
port numbers is 1x 2x 3x 4x.... So the crossover is done at the port if
you use a switch or a hub, almost everything else do not have a crossed
port.
The two pars "pin 1,2" and "pin 3,6" must be crossed.
Crossed cable:
1-3 White/Orange
2-6 Orange
3-1 White/Green
6-2 Green
Straight cable:
1-1 White/Orange
2-2 Orange
3-3 White/Green
6-6 Green
So if you connect two switches together both ends is crossed so you are
back to where you started. Then you need a crossed cable. :-)
>Karl
>
>If, according to your rule, similar devices use
>crossover and disimilar use striaght cable, then what
>about connection between
>
>1)computer to Router
>2)Router to Firewall
>3)Firewall to VPN Concentrator etc...
>
>All these connections need Crossover cable. You can
>verify this in the lab. Please read my previous
>explanation, you'll understand the concept.
>
>Regards.
>
>Asim Khan
>
>
>
>>Viz: Two computers connected back to back X-over
>> Two Routers connected back to back X-over
>> Two HUBs " " " X-over
>> Two Switches " " " X-over
>>
>> ALL Else use
>> Straight Thru.
>>
>>
>>>>Computer to Router ----> Cross Cable
>>>>Router to Router ----> Cross Cable
>>>>Computer to Computer -----> Cross Cable
>>>>Computer to Switch/Hub---> Straight Cable
>>>>Router to Switch/Hub ----> Stright Cable
>>>>Switch to Switch -----> Cross Cable
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