A repository of data related to the manuscript titled "Distributed Abstraction and Verification of an Installed Optical Fiber Network" A joint experiment between the University of Cambridge, University of Bristol and UCL to abstract the transmission performance of part of the national dark fibre facility. MATLAB file TRx_Calbrations.m reports the receiver calibration phase. excel file RawLoopBackResults_Dec2018_v1.xlsx contains the reported results for the abstraction probing phase from each partner. excel file Summary_for_Partners_v3.xlsx summaries the abstraction phase and reports the verification results. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% The authors acknowledge funding support from the UK EPSRC (through the project INSIGHT EP/L026155/2 and the programme TRANSNET EP/R035342/1), the UK Royal Academy of Engineering under the Research Fellowships scheme and the EU H2020 project(Metro-Haul,761727), equipment from Ciena and Facebook and use of the UK EPSRC National Dark Fibre Facility, EP/S028854/1. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%