This article describes optical subnets ofgrowzd based receiving stazionsfor earth-space optical communications. The optical subnet concepts presented here providefuilline-of-sight coverage ofthe ecliptic, 24 hours a day, with high weather availability. The technical characteristics ofthe optical station and the user terminal are presented as well as the effects ofcloud cover, transmittance through the atmosphere, and impact ofbackground noisefor day or night time operation upon the communication link. In addition, candidate geographic sites are identified, and a link designfor a hypothetical Pluto mission in 2015 is included.