DocuTech is the name given to a line of electronic production-publishing systems produced by Xerox Corporation.
However, image generation in the DocuTech was performed using a digitally driven, dual-beam, Laser ROS (Raster Output Scanner) rather than by the light-lens optics and exposure lamps found in the "analog" 5090 system.
The scanner also had a semi-automatic side feeder which could be used to scan large originals and computer fan-fold (CFF) input.
The ESS incorporated a large number of Xerox proprietary Mesa processors which were specifically designed for high-speed image processing, 32 MegaBytes of RAM, I/O control interfaces for communicating with the Printer and Scanner modules, as well as 3 disk drives which contained system software and space for storing images (including those for saved jobs).
The network connectivity to allow sending print jobs over was absent on release, but planned for the following year.
In fact, the Xerox DocuTech line of publishing systems is largely credited with establishing the "print-on-demand" industry.