Need help matching CAT5 to 4-core instrument cable.

Hi all,





I have a setup where a Power Over Ethernet Network is connected to a towed instrument vechile behind a ship.  The length of the cable can be up to 3km's long.  The Ethernet extender works fine with CAT5 cable at these lengths, but not with the armored 4-core cable used in maritime applications.





The maritime cable has a typical capacitance of 20uF/1km @kHz between cores and a DC resistance of 188Ohms/km.





The CAT5 spec calls for a DC loop resistance of <188Ohm/km and a capacitance of 200pF/twisted pair/km.





My question:


Would it be possible to build a matching network that would match the Ethernet extender and receiver to the maritime cable?  If so, what would be the design methology/steps be that I would need to follow?





Any advice would be greatly appreciated.





Best regards,





André