Multibus boards are backplane crate systems that are designed to hold modules. Multibus boards are similar to computer automated measurement and control (CAMC) and network interface module (NIM) systems. A CAMC board is a modular data handling system which is mainly used in data acquisition. The network interface module (NIM) contains the system control processor that manages the operation of the entire of the system. Intel® Mulitbus Boards use Intel 8086, 8088, 80186 and 80386 processors. There are many different types of Intel® Multibus Boards. Examples include Multibus I boards and Multibus II boards. Both Multibus I and II boards are provided with jumper options that need to be set, but in Multibus II these options can be set by software control rather than using a conventional technique of jumpers or wire-wrapping. A multibus backplane is incorporated in an AGS+ modular router chassis. A split multibus backplane is mainly used in multiprocessor systems. Other multibus boards are commonly available.
There are several ways in which multibus boards function. Multibus boards contain a mutibuse which is a data bus that interconnects the processor and the multibus interface cards. A CAMC board covers the electrical and physical specifications for the modules, a crate backplane, and instrument housings. Multibus I boards use card edge fingers as connectors. Multibus II boards are 32-bit microprocessor buses at 80MBps and are widely used. Multibus II boards are available in two sizes which are 3U x 220mm and 6U x 220mm (U= 1.75 inches). Multibus II boards are capable of working together without any bus timing or bus loading problems. Multibus boards are designed and manufactured to meet most industry specifications.
Multibus boards are used in many applications. Examples include air traffic control, communication systems, and in logical applications. Multibus boards should adhere to standards approved by the Institute of Electrical and Electronics Engineers, Inc. (IEEE).