From: Karl Young (kaelwyoung@xxxxxxxxxxxx)
Date: Mon Jul 22 2002 - 13:24:32 GMT-3
The Rule I have always used is this : If you have two of the same devices Us
e a X-over. all else use a straight thru.
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.
Karl.
<jakeczyz@yahoo.com> wrote:
>Well said!! The only other thing I might add is that you can think of it in t
erms of DTE
>and DCE. Whenever you connect two DCE together or two DTE together, you'll nee
d to
>crossover, otherwise use straight through. Since routers, firewalls, and, of c
ourse, PC's
>are all considered DTE (data terminal equipment) while switches, hubs, and bri
dges are
>considered DCE (data communications equipment) the rules make sense.
>
>Just my $.02 worth.
>
>HTH,
>Jake
>9102
>
>
>--- Asim Khan <asimmegawatt@yahoo.com> wrote:
>> Tom,
>>
>> The decision when to use Cross and when to use
>> straight cable depends upon the interface type. By
>> defualt all the interfaces are grouped in two classes;
>> MDI (media dependent interface) and MDI-X (media
>> dependent interface-Crossover i.e internally crossed).
>> All the end devices have MDI interfaces like Routers,
>> Computers, Firewalls etc. Whereas all the intermediate
>> devices have MDI-X interfaces like Switches and Hubs.
>> So when you connect two MDI interfaces you will have
>> to use Cross cable. Similarly between MDI and MDI-X
>> interfaces you have to use Straight and between two
>> MDI-X interfaces you have to use Cross. So from above
>> discussion we conclude
>>
>> 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
>>
>> Remember on some Hubs we have uplink port which can be
>> changed from MDI to MDI-X and vice versa through the
>> toggle switch located near the uplink port.
>>
>> Hope this helps.
>>
>> Asim Khan
>>
>>
>> --- Tom Young <gitsyoung@yahoo.co.jp> wrote:
>> > Hi, group
>> >
>> > A very simple question ,may I use crossover cable
>> > to
>> > connect a computer to router's ethernet port
>> > directly?Certainly I will set the port address and
>> > computer's address in one subnet.
>> >
>> > Thanks
>> >
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