strange ethernet electric problem

strange ethernet electric problem
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Subject Author Date
strange ethernet electric problem peancor 06-22-2007
Posted by peancor on June 22, 2007, 5:39 am
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Hello,
we have to connect two computers via ethernet in an industrial
enviroment. we are using a crossover cable to connect both computers.

If i connect my laptop running with bateries to one of this computers
the ethernet connection works fine but when i plug my laptop to the
power line the ethernet connection brokes. This power line is common to
all devices and we have tested with several cables.

This problem does not happen always. Some days all seems to work fine
but other days the ethernet connection does not work a all.

Any ideas?

Pure Networks
Posted by glen herrmannsfeldt on June 22, 2007, 6:47 am
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peancor wrote:

> we have to connect two computers via ethernet in an industrial
> enviroment. we are using a crossover cable to connect both computers.

> If i connect my laptop running with bateries to one of this computers
> the ethernet connection works fine but when i plug my laptop to the
> power line the ethernet connection brokes. This power line is common to
> all devices and we have tested with several cables.

Are they homemade crossover cables? It is possible that a mispaired
cable could cause that problem. It must be such that pins (1,2)
and pins (3,6) are each the two wires of a twisted pair.

-- glen


Posted by ghost in the machine on June 22, 2007, 9:10 am
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The cables work fine in my development enviroment. It is only in the
industrial enviroment where the failure is detected and i suppose that
it is related to the power line since my laptop connects fine when it is
running on batteries.

>
> Are they homemade crossover cables? It is possible that a mispaired
> cable could cause that problem. It must be such that pins (1,2)
> and pins (3,6) are each the two wires of a twisted pair.
>
> -- glen
>
>


Posted by Al Dykes on June 22, 2007, 9:23 am
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>
>The cables work fine in my development enviroment. It is only in the
>industrial enviroment where the failure is detected and i suppose that
>it is related to the power line since my laptop connects fine when it is
>running on batteries.
>
>>
>> Are they homemade crossover cables? It is possible that a mispaired
>> cable could cause that problem. It must be such that pins (1,2)
>> and pins (3,6) are each the two wires of a twisted pair.
>>



You haven't answered the question.

--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore. A Proud signature since 2001

Posted by peancor on June 22, 2007, 12:39 pm
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Sorry, the cables are cat5e but the ethernet connectors are attached to
the cable manually (i dont know the name of the machine used to do
that).



>>
>>The cables work fine in my development enviroment. It is only in the
>>industrial enviroment where the failure is detected and i suppose that
>>it is related to the power line since my laptop connects fine when it
>>is running on batteries.
>>
>>>
>>> Are they homemade crossover cables? It is possible that a mispaired
>>> cable could cause that problem. It must be such that pins (1,2)
>>> and pins (3,6) are each the two wires of a twisted pair.
>>>
>
>
>
> You haven't answered the question.
>


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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