Product Code Database
The Enhanced Digital Access Communication System ( EDACS) is a
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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 EDACS system architecture supported large communications footprints. By making the GETC's "trunk" among themselves, one GETC per channel, the system was designed to be inherently fault-tolerant. 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 it cleanly into such wide distribution.
AEGIS was the second generation EDACS digital voice mode, made once again by GE, with Adaptive Multiband Encoding as its coding scheme. The voice quality was supposedly 10 times better than Voice Guard, but it was still not very great, especially compared to ProVoice.
ProVoice is Tyco Electronics' (formerly M/A-COM, Ericsson and GE) implementation of IMBE digital modulation for radio communications, being the third generation of EDACS digital voice. It is not APCO-25 compliant, but does use the same IMBE vocoder developed by Digital Voice Systems, Inc. (DVSI). The technical difference between ProVoice and the APCO Project-25 standard is how error correction and modulation is provided to transmit the data.
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