"This SAE Aerospace Standard (AS) establishes guidelines for the use of IEEE-1394b as a data bus network in military and aerospace vehicles. It encompasses the data bus cable and its interface electronics for a system utilizing S400 over copper medium over extended lengths. This document contains extensions estrictions to ""off-the-shelf"" IEEE-1394 standards@ and assumes that the reader already has a working knowledge of IEEE-1394. This document does not identify specific environmental requirements (electromagnetic compatibility@ temperature@ vibration@ etc.); such requirements will be vehicle-specific and even LRU-specific. However@ the hardware requirements and examples contained herein do address many of the environmental conditions that military and aerospace vehicles may experience. One should reference the appropriate sections of MIL-STD-461E for their particular LRU@ and utilize handbooks such as MIL-HDBK-454A and MIL-HDBK-5400 for guidance. This document is referred to as a ""slash sheet"" and accompanies the SAE Sxxxx base standard. Purpose: The purpose of this document is to define an approach to using IEEE-1394b over extended distances in safety-critical/mission-critical applications for military and aerospace vehicles. This document is controlled and maintained by the SAE with technical support from subsystem vendors. Application: The information herein may be used to assist the design@ fabrication@ and maintenance of the subsystems that interface via the vehicle's network. Interpretation: The following interpretations shall be placed upon these words@ unless stated otherwise@ where they are used in this document. May: An allowed action. Shall: A mandatory requirement. Should: A recommended action. Will: A declaration of intent."