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.
... of mankind, who can not be recluses,
are called.
The charge has even been made that
the piety commended by the "Imitation" is of a
selfish monkish type. It was ...