strange ethernet electric problem

[fert]

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?

[Annabell]

Hi fert

Just a thought, try taking the battery out of the Laptop then connect power and boot, what OS are the two Computers and what OS is the Laptop ?.