  The Compact Muon Solenoid (CMS) detector is one of two general-purpose
detectors that measure the products of high energy particle interactions in the
Large Hadron Collider (LHC) at CERN. The silicon pixel detector is the
innermost component of the CMS tracking system. The detector which was in
operation between 2009 and 2016 has now been replaced with an upgraded one in
the beginning of 2017. During the previous shutdown period of the LHC, a
prototype readout system and a third disk was inserted into the old forward
pixel detector with eight prototype blades constructed using the new digital
read-out chips. Testing the performance of these pilot modules enabled us to
gain operational experience with the upgraded detector. In this paper, the
reconstruction and analysis of the data taken with the new modules are
presented including information on the calibration of the reconstruction
software. The hit finding efficiency and track-hit residual distributions are
also shown.
