OEM
Hughes Information Technology Systems
Satellite Telemetry Switching
  Mid-Atlantic RF Systems, a Systems Integrator in Forest Hill, MD developed a satellite telemetry switching system which employs an embedded EDAS Ethernet Data Acquisition System. Hughes Information Technology Systems employs these systems, called Switch Mainframe Assemblies (SMA's), to switch satellite telemetry communications from one base station, or ITCU, to another in the event of a base station failure. The SMA allows Hughes to minimize communications downtime with the satellites. The system is a relay matrix which connects satellite command signals to a selected uplink and satellite telemetry downlink signals to a selected ITCU. In the event of a faulted on-line ITCU, the SMA switches in a hot back-up (redundant) ITCU. All switching is performed by TTL logic, while the EDAS system provides the communications link between the SMA and a host computer where commands are issued.

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