Page No. 1 Kelvin Nichols Payload Operations and Integration Center EO50 Delay Tolerant Networking (DTN) Implementation on the International Space Station.

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Page No. 1 Kelvin Nichols Payload Operations and Integration Center EO50 Delay Tolerant Networking (DTN) Implementation on the International Space Station (ISS) Joint Station LAN (JSL)

Page No. 2 Project Objectives: Provide an end to end DTN service for ISS users (Payload Developers and the Flight Control Team) in an effort to improve operational efficiency and to increase ISS research and technology utilization. Provide enhanced file transfer capabilities as an initial operation capability which will utilize the DTN service being implemented under this project. Provide an opportunity for Payload Developers to design applications that can take full advantage of the DTN service to help simplify/automate some of their payload operations. Provide a high-fidelity in-space operationally-relevant testing platform to test, verify, and mature DTN protocol features necessary for advanced explorations communications systems

NASA MSFC Mission Operations Laboratory MSFC Page 3 Benefits to payloads  DTN Benefits to Payload Communications : —Provides capability for Payload Developers (PDs) to automate operations and ensure science delivery with little regard for link or facility outages  HOSC and ISS DTN nodes will store user file uplinks/downlinks and forward bundles as Ku-band becomes available  HOSC DTN node will also store user telemetry and forward it to the PD site when it comes back online —Reduce PD real-time support to access and downlink science data  DTN stores data during LOS and automatically initiates transfer upon AOS  A download transfer can span Ku-Band AOS periods without any special scheduling or scripting  Reduces need for duplicate storage and extra retrieval actions —Reliable data transfer for ISS during LOS/AOS cycles  Automatic verification of bundle receipts, retransmissions reduced  When transmission errors occur only the bundles that have errors are retransmitted  Maximizes use of bandwidth by reducing the amount of data that has to be retransmitted —Allows PDs to use DTN protocols for their own applications (streaming, telemetry, etc.)

NASA MSFC Mission Operations Laboratory MSFC Page 4 MCC, HOSC and SDIL Implementation Ground Architecture  HOSC Ground System DTN Architecture includes: –Modification to HOSC DTN nodes running DTN2 implementation to communicate with ISS and MCC-H DTN Nodes (Existing resource that supported CGBA DTN operations) –New DTN ION enabled version of TReK software (TReK v4.1.0):  ION Wrapper – a utility program to start /stop ION, automatically generate ION configuration files, etc.  Updates TReK CFDP products to work with ION. –New Bundle replay capability for the HOSC science archive –Leverages network interfaces deployed under CR Payload Ku-Forward  MCC Modifications include: –Deploy DTN Nodes in OCA Ops (3) and one in OCA Development and Integration Environment (ODIE) - Leverages OCA 21 design –Install SWRDFSH and DTN on the OCA

NASA MSFC Mission Operations Laboratory MSFC Page 5 ISS System Implementation Architecture  ISS DTN Architecture includes: –Two DTN nodes using Interplanetary Overlay Network (ION) on an SSC File Server platform  ION is developed by JPL, and maintained by NASA (open source, publically available application) –Incorporates DTN capability on SSC and Payload Express Laptops –Payload Developers will be able to use the same TReK software onboard at their Payload to access the ISS DTN institutional service. PD’s will have the option to use TReK toolkit to access the ISS DTN Payload node