Caledonian has produced a very small volume Smart Multifunction Display (SMFD) that has a considerable degree of capability integrated within it. The aim of this product was to integrate the symbol generator (Usually an LRU in its own right) within the SMFD enclosure. Further the SMFD can display various video standards and has integrated within its enclosure the capability to digitise a number of aircraft data buses such as Integrated Multiple Synchro and Aircraft Instrument Digitiser Modules. The unit also features ARINC 419/429, Mil Std 1553, Analogue and Discrete Interfaces. Owing to its small size, volume and mass it is not uncommon to install these units in pair to aid failure redundancy.