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1 pair (two wires)

That's a classic :-)

Thanks VE1BLL.. Wireless is not an option too. Did I mention that the 4 km distance is actually drilled inside the ground :-)

Thanks all for the replies. Sorry. I forgot to mention the data rate. The minimum requirement is ~ 150 kbps downstream and less than 10 kbps upstream. But, it is better to design for 200 kbps downstream for future expansion. The data is mostly video images and/or sound waves. It may not look as...

Hi All, I will start by introducing myself, I am a Professional Engineer in the province of Alberta-Canada. Also a partner in a small company (4 of us). We build instrumentaions and sensors for the oil and gas industry. We have a potential project coming up and I am doing some background...