ABSTRACT
In the late 1980s, there was a push toward integration of multiple functions on a common computing and I/O platform, also referred to as integrated modular avionics (IMA). This push was due to the advantages of IMA systems over then prevalent federated architectures. The advantages are decreased size, cost and weight, increased reliability, less-frequent maintenance and more flexibility. The success of an IMA system hinges on a backplane bus connecting Line Replaceable Modules (LRMs). The backplane bus must be designed to support the requirements of space and time partitioning. These requirements are derived from the concept of “robust partitioning” that prevents functions on a common platform from adversely influencing each other, even when some functions may be faulty. Honeywell designed SAFEbus as a backplane for the Aircraft Information Management System (AIMS), which is the IMA part of the avionics for the Boeing B-777 airplane.
