The NASA Integrated Services Network (NISN) is a global system of communications transmission, switching, and terminal facilities that provides NASA with wide area network communications services. The NISN services that support the Space Network (SN) include real-time and mission critical Internet Protocol (IP) routed data, as well as high-rate data and video services that connect the SN ground facilities. Inter-Center mission voice communications services are also provided for management of the network and support of user missions.
- Space Network Ground Segment Sustainment (SGSS) Mission System Requirements Document (MSRD). Section 3.6.1, NISN. NASA/GSFC: November 21, 2008