Ethernet LAN Crossover Vs. Patch Cables

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Subject Author Date
Crossover Vs. Patch Cables Tony 03-09-06
Posted by Tony on March 9, 2006, 11:15 am
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Hi everyone,

Can some people chime in as to whether or not patch cables are the same
as crossover cables? Are they or are they not the same? If you do not
already know the answer I would prefer you not respond. Please do not
look on Google to get your answer. :)

I recently bought three crossover cables from ComputerCableStore.com.
When the cables arrived I found they were actually patch cables, not
crossover cables. When I e-mailed the customer service person about the
problem she insisted that "patch" is just another term for "crossover".
In other words, ComputerCableStore.com is claiming there is no
difference between patch and crossover cables.

I'm not an Ethernet expert but I'm pretty sure (about 99.9%) that
crossovers are different from patch. Is it true or is the customer
service person from ComputerCableStore.com correct?

Thanks.


Posted by Stephen Sprunk on March 9, 2006, 12:41 pm
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> Hi everyone,
>
> Can some people chime in as to whether or not patch cables are the same
> as crossover cables? Are they or are they not the same? If you do not
> already know the answer I would prefer you not respond. Please do not
> look on Google to get your answer. :)
>
> I recently bought three crossover cables from ComputerCableStore.com.
> When the cables arrived I found they were actually patch cables, not
> crossover cables. When I e-mailed the customer service person about the
> problem she insisted that "patch" is just another term for "crossover".
> In other words, ComputerCableStore.com is claiming there is no
> difference between patch and crossover cables.
>
> I'm not an Ethernet expert but I'm pretty sure (about 99.9%) that
> crossovers are different from patch. Is it true or is the customer
> service person from ComputerCableStore.com correct?

Crossover cables have pins 1&2 swapped with pins 3&6. Patch cables have no
swaps. When you look at the plastic connector on each end (pins up), you
should be able to tell which you have based on the colors inside.

S

--
Stephen Sprunk "Stupid people surround themselves with smart
CCIE #3723 people. Smart people surround themselves with
K5SSS smart people who disagree with them." --Aaron Sorkin

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Posted by DLR on March 9, 2006, 5:01 pm
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Stephen Sprunk wrote:
>> Hi everyone,
>>
>> Can some people chime in as to whether or not patch cables are the same
>> as crossover cables? Are they or are they not the same? If you do not
>> already know the answer I would prefer you not respond. Please do not
>> look on Google to get your answer. :)
>>
>> I recently bought three crossover cables from ComputerCableStore.com.
>> When the cables arrived I found they were actually patch cables, not
>> crossover cables. When I e-mailed the customer service person about the
>> problem she insisted that "patch" is just another term for "crossover".
>> In other words, ComputerCableStore.com is claiming there is no
>> difference between patch and crossover cables.
>>
>> I'm not an Ethernet expert but I'm pretty sure (about 99.9%) that
>> crossovers are different from patch. Is it true or is the customer
>> service person from ComputerCableStore.com correct?
>
> Crossover cables have pins 1&2 swapped with pins 3&6. Patch cables have
> no swaps. When you look at the plastic connector on each end (pins up),
> you should be able to tell which you have based on the colors inside.
>
I've always thought of cross over cables as a subset of patch cables. A
patch cable in it's most generic meaning is a cable used to "patch" a
circuit between 2 jacks. Within that generic meaning I think of regular
vs crossover. And most folks call patch and "regular" the same. But a
crossover is a specialized case. Now days most folks don't even realize
the need for crossover cables as most hubs, switches, NICs, etc., auto
recognize the signals.

But to answer your question, a "patch" cable isn't always a crossover
cable. The seller is wrong.

Posted by Randy R on March 9, 2006, 3:03 pm
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> Hi everyone,
>
> Can some people chime in as to whether or not patch cables are the same
> as crossover cables? Are they or are they not the same? If you do not
> already know the answer I would prefer you not respond. Please do not
> look on Google to get your answer. :)
>
> I recently bought three crossover cables from ComputerCableStore.com.
> When the cables arrived I found they were actually patch cables, not
> crossover cables. When I e-mailed the customer service person about the
> problem she insisted that "patch" is just another term for "crossover".
> In other words, ComputerCableStore.com is claiming there is no
> difference between patch and crossover cables.
>
> I'm not an Ethernet expert but I'm pretty sure (about 99.9%) that
> crossovers are different from patch. Is it true or is the customer
> service person from ComputerCableStore.com correct?
>
What do you need a crossover cable for?
Crossover cables are usually used for connecting between network equipment,
but usually home network stuff autodetect whether or not you are using a
crossover cable, or there is a button to push to switch between the 2,
usually on port 1.
The only time I have seen where you absolutely have to have a crossover
cable is between a DSL router and a computer or switch, or for connecting 2
computers without a switch or hub. (I use one for connecting my Xbox to a
computer.)

Randy R



Posted by Mike on March 10, 2006, 7:55 am
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>The only time I have seen where you absolutely have to have a crossover
>cable is between a DSL router and a computer or switch, or for connecting 2
>computers without a switch or hub. (I use one for connecting my Xbox to a
>computer.)

If you'd like examples, I have a couple of Cisco 11501 content
switches operating in chassis redundancy mode where they *must* be
connected by means of a crossover cable.

Mike.

--
Entia non sunt multiplicanda praeter necessitatem

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