Purpose of LSST Long-Haul Networks
Provide reliable connectivity of sufficient bandwidth between all LSST Observatory sites (Base, Archive, Headquarters, and TBD Data Access sites) to meet transfer requirements.
Specifications and Design Documents
Data Management System-level network specifications (extracted from LSE-61 Data Management Subsystem Requirements)
180 days MTBF/year
48 hours MTTR/year
Base to Archive nightly data volume (science images and meta-data): 15TB
Amount of time available to transfer data from Mountain to Base to Archive:
Crosstalk-corrected images for Alert Production: 6 seconds to move between 7 and 13 Gbytes (depending on compression)
Raw images: 24 hours
Note, there is also Observatory Control System and other operational data transferred at night, and there is daytime engineering and calibration traffic potentially at the same volume. Finally, there is periodic data transfer from the Archive to the Base, primarily as a result of annual Data Release Processing. All the data flows and allocated bandwidths are defined in the following documents.
The LSST Long-Haul Networks are further specified in LSE-78 LSST Observatory Network Design
The schedule of deployment of links and bandwidth is documented in LDM-142 Network Sizing Model
The draft LSST Network Operations and Management Plan defines the plan for operating and maintaining the LSST networks as a single integrated process.