Redundancy board for the Application Module - AMR (51401070-100). The Application Module Redundancy Subsystem includes two Application Module nodes that are cable-connected through AMR or EAMR boards and a K4LCN16 processor.

AM Redundancy includes hardware (51401070-100) and software that allow a secondary AM to back up the operation of the primary AM. To do this, all of the application data in the primary AMR is transferred to the secondary AMR, where an exact copy of the data is maintained to be used if the primary AMR should become inoperative.

AM Redundancy requires the following memory in redundant AMs: 157,000 words (fast/slow processor buffers), plus an additional 22,000 words for the AM redundancy Internetwork Point Processor (IPP) option if used. The total amount of memory in an AM can range from 3 Mw to 16 Mw (Mw = one million words). The amount of user memory available in an AM is a function of the total AM memory size. The total AM memory used increases with each point loaded into the AM and with each CL block linked to a point. If one of these operations results in the total memory used exceeding the total user memory available, the operation is aborted and an error message is generated.