The National Aeronautics and Space Administration (NASA) Tracking and Data Relay Satellite (TDRS) System (TDRSS) is a unique, world-class satellite communications system which relays command, telemetry, and science data between on-orbit customer spacecraft and the ground. The purpose of the User Services Subsystem (USS) Component Replacement (USS CR) Project is to replace and upgrade, as necessary, the S-Band and K-Band (Ku & Ka) Single Access (SA) equipment in the Space Ground Link Terminals (SGLT) at the White Sands Complex (WSC). The replacement of the obsolete SN ground segment S-band and K-band equipment with upgraded new equipment requires modifications to the existing architecture for the two SGLTs. This new equipment includes both the narrowband (NB) and wideband (WB) modems that support advanced modulation and coding techniques such as Low Density Parity Check (LDPC) code, Turbo Product Code (TPC) and 8-PSK in addition to the conventional signal structures, as well as the new frequency converter and the associated control and monitor subsystem with TCP/IP and Simple Network Management Protocol (SNMP) interface protocols. This paper describes the upgraded two SGLTs, the new architecture and interfaces and the new system hardware (NB and WB modems, frequency converter and the new control and monitor subsystem, etc) that supports SA services. The enhanced capability of the USS-CR modems is presented.
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