System 75: Physical architecture and design

This paper discusses the physical architecture, the rationale for design choices, and the physical design of the System 75 office communication system. The design features a single equipment cabinet housing up to 720 ports, a display-enhanced attendant console, and a modular-jack-based station-administration facility. The architecture minimizes the small system cost while providing modular building blocks for feature additions and growth. Customer participation in maintenance and administration is encouraged by attention to human factors in design and labeling details.