LSE-76 is the ICD for the DM to Summit Facility interface. This is an interface defining the physical requirements of DM at the Summit Facility. It is an interface between DM and Telescope & Site.
At present this appears to be limited to the rack space, power, and cooling required for the Summit-Base network endpoint. The rest of the Summit network is not formally a DM deliverable, though it is part of the integrated LSST network design described in LSE-78.
The completion of this milestone will reflect the conclusion of an agreement between DM and T&S on the details of the physical requirements, with these details added to LSE-76.