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EDACS



EDACS: The Enhanced Digital Access Communication System A radio communications protocol and product family invented in the General Electric Corporation, in the mid 1980's A brilliant young designer, Jeff Childress, created an autonomous radio base-station controller, known as the GETC (General Electric Trunking Card). The GETC was a general purpose controller with input/output optimized for radio system applications. Considered somewhat of a "jumper demo-kit" the GETC's unparalleled flexibility remains a testiment to American industrial engineering, and hundreds of thousands of users in the field continue to rely on this innovation for their daily operations, safety and security. Childress and the team demonstrated that a smart controller could be adapted to a variety of applications, but his interest was really in fault tolerance. The competition dealt with fault tolerance by means of the "brute force and ignorance" approach, deploying double the hardware for their controllers, and interconnecting them with massive and problematic relay banks. The EDACS system architecture supported extremely large communications footprints. By making the GETC's "trunk" among themselves, one GETC per channel, the system was designed to be inherently fault-tolerant. If one channel, or device, experienced problems, the others voted it off the network, and calls continued to be processed with the remaining resources. This provided substantial hardware reductions, and the required software efforts yielded a variety of unique features and options. This was not a new concept in systems design, however, few other teams have embodied this elegence into such wide distribution. The EDACS system continues to be sold, and supports a sizable portion of the market today for the public safety, public transit, and industrial two-way radio communications field. EDACS was developed in competition with Motorola's Smartnet trunking system. It claimed, and continues to hold, significant market share. GE teamed with Sweden's Ericsson, and the company became Ercisson GE, and eventually was sold after the telecom meltdown Over 500 large-scale EDACS radio systems have been sold, with hundreds of thousands of radios, and revenues in the billions. M/A-COM Inc, a holding of Tyco Electronics, acquired the asset (see OpenSky), and many of the original team members, some of their children, and even a few grandchildren continue to manufacture and support this innovative product family.


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EDACS


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