The Horizon® Communications System

When the Horizon Communications System was introduced in 1977, it was one of the first processor-controlled hybrid Key TelephonePBX systems in the marketplace. It has evolved over time and been enhanced by adding both features and functions. This paper reviews Horizon´s design and discusses some of the goals and the rationale which guided the development. Other than station message detail recording (SMDR) and toll restriction, Horizon´s rich set of PBX features and their operation are not discussed. Rather, the technology employed, the system architecture, the relationship of the major component parts, the system software structure, and the maintenance and administration capabilities are explained.