nx-interface is supplied with a 1m communication cable to mount on the device.
Cables of different lengths (3m, 10m and 50m) can be ordered. Item reference is:
nx-ethernetCab 3m/10m/50m. The length in meters is specified in reference.
You can buy your own ethernet cable for communication; it must be ethernet cat5
with 26AWG.
The maximal distance between the inverter and the nx-interface depends then on
the rest of the cabling. The total communication cable length in one system for the
Studer-nx-bus is 75m.