CAT6 cable by the roll

[James Knott]

Lennart Sorensen wrote:
> On Sat, May 26, 2007 at 12:34:57AM -0400, Jamon Camisso wrote:
>   
>> Here we are: http://www.connectworld.net/syscon/support.htm
>>
>> "1. What is the difference between CAT-5, CAT-5e, CAT-6, CAT-7...
>>
>> The Simple Answer:
>> CAT-5 is rated to 100M
>> CAT-5e is rated to 350M
>> CAT-6 and CAT6e is rated to 550M or 1000M depending on your source
>> CAT-7 is supposedly rated to 700M or presumably 1000M"
>>
>> I hadn't heard of the 6e variety. What is so enhanced (and how) where 
>> the e designator is present anyways?
>>     
>
> So 5e should be more than plenty for Gbit ethernet.  Gbit runs 4 pairs,
> each at 125MHz, with transfers on both clock edges, so 4 * 2 * 125MHz =
> 1Gbit/s.  Of course it both sends and receives on each pair so the
> overlapping signals may cause interesting other frequencies, but 5e
> should be plenty, and 6 even better.
>
> --
> Len Sorensen
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>   
There shouldn't be "interesting other frequencies" unless there's some 
non-linear device in the circuit.  So, if you're getting that, I'd look 
for a bad connection or defective NIC.

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