How to set NID on Evolution Network

Some remotes are better able to identify the correct satellite if they have a network ID. This NID is a four digit number that is part of the DVD-S2 transmission protocol, as used by the downlink on evolution networks. I would like to assign a unique NID to my downlink carrier. I am thinking this could be done with some sort of custom key on the network configuration, like NID = 2321
Does anyone know how to do this?