The Space Network (SN) is a data communication system comprised of a constellation of Tracking and Data Relay Satellites (TDRSs) and various ground terminal complex employing high-gain microwave antennas.  The combination of elements comprising SN allows ESC to offer 24/7 support to our customers including global telecommunication services for telemetry, tracking, and command between low earth orbit (LEO) spacecraft and customer control and data processing facilities.