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10.1 OVERVIEW
Specifically developed for computer communications in a factory environment
1980 GM decides to begin development of a networking protocol for the high data rates expected, while improving noise immunity. This scheme was expected to provide a common standard for all equipment to simplify integration.
Standards are so broad that they have become very complex and hard to develop hardware and software for, thus driving up the costs
Versions 2.1 and 2.2 left the application layer under-defined, but a new effort in version 3.0 to define the application layer. This has lead to even higher levels of disagreement.
In 1985 GM realized that it couldn't meet its needs for CIM. Only 15% of the 40,000 programmable devices could communicate.
No single vendor could meet all the needs, and multiple vendors caused communication incompatibilities.
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