SPSCGR generates a contact graph suitable for use by the ION (Interplanetary Overlay Network) DTN (Delay/Disruption Tolerant Network) implementation from data provided by the JPL SPS (Service Preparation System) Portal. Prior to SPSCGR, there was no way for a mission or other entity to route DTN traffic across the DSN without manually constructing a contact graph. SPSCGR automates this process of contact graph construction.

The tool generates a syntactically correct DTN contact graph from antenna scheduling information from the DSN SPS Web portal. The DTN contact graph is a data structure used by the JPL-developed ION implementation of the internationally standardized DTN specification to make efficient data routing decisions.

SPSCGR runs on a variety of platforms with a minimum of dependencies.

This work was done by Philip C. Tsao of Caltech for NASA’s Jet Propulsion Laboratory.

This software is available for commercial licensing. Please contact Dan Broderick at This email address is being protected from spambots. You need JavaScript enabled to view it.. Refer to NPO-48907.

This Brief includes a Technical Support Package (TSP).

(reference NPO48907) is currently available for download from the TSP library.

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This article first appeared in the November, 2015 issue of NASA Tech Briefs Magazine.

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