Institutional Computing and Information Services (ICIS).

Harris Corporation is under a 5-year contract to JPL for the DSN's operations and maintenance. Harris has responsibility for managing the Goldstone complex, operating the DSOC, and for DSN operations, mission planning, operations engineering, and logistics.

Antennas 

Each complex consists of at least four deep space terminals equipped with ultra-sensitive receiving systems and large parabolic-dish antennas. There are:

 One  diameter High Efficiency antenna (HEF).
 Two or more  Beam waveguide antennas (BWG) (three operational at the Goldstone Complex, two at the Robledo de Chavela complex (near Madrid), and two at the Canberra Complex).
 One  antenna.
 One  antenna.

Five of the  beam waveguide antennas were added to the system in the late 1990s. Three were located at Goldstone, and one each atcontrol the antennas, receive and process the telemetry data, transmit commands, and generate the spacecraft navigation data. Once the data is processed at the complexes, it is transmitted to JPL for further processing and for distribution to science teams over a modern communications network.

Especially at Mars, there are often many spacecraft within the beam width of an antenna.  For operational efficiency, a single antenna can receive signals from multiple spacecraft at the same time.  This capability is called Multiple Spacecraft Per Aperture, or MSPA.  Currently the DSN can receive up to 4 spacecraft signals at the same time, or MSPA-4.  However, apertures cannot currently be shared for uplink.  When two or more high power carriers are used simultaneously, very high order intermodulation products