  The Cherenkov Telescope Array (CTA) is the next-generation ground-based
observatory for very-high-energy gamma-ray astronomy. An innovative 9.7 m
aperture, dual-mirror Schwarzschild-Couder Telescope (SCT) design is a
candidate design for CTA Medium-Sized Telescopes. A prototype SCT (pSCT) has
been constructed at the Fred Lawrence Whipple Observatory in Arizona, USA. Its
camera is currently partially instrumented with 1600 pixels covering a field of
view of 2.7 degrees square. The small plate scale of the optical system allows
densely packed silicon photomultipliers to be used, which combined with
high-density trigger and waveform readout electronics enable the
high-resolution camera. The camera's electronics are capable of imaging air
shower development at a rate of one billion samples per second. We describe the
commissioning and performance of the pSCT camera, including trigger and
waveform readout performance, calibration, and absolute GPS time stamping. We
also present the upgrade to the camera, which is currently underway. The
upgrade will fully populate the focal plane, increasing the field of view to 8
degree diameter, and lower the front-end electronics noise, enabling a lower
trigger threshold and improved reconstruction and background rejection.
