One-way satmodems (DVB-IP modems ) use a return channel not based on communication with the satellite, such as telephone or cable.
Two-way satmodems (DVB-RCS modems, also called astromodems) employ a satellite-based return channel as well; they do not need another connection. DVB-RCS is ETSIstandardEN 301 790.
... 959 housing units at an average density of 83.8/km² (216.9/mi²). The racial makeup of the town is 98.03% White, 0.59% African American, 0.00% Native American, ...