ARINC 664, Part 5 provides the design and implementation guidelines for networks installed in aircraft. Such networks may be used to enable network devices to communicate among themselves and with networks outside of the aircraft. This specification defines a set of domains within the aircraft. These domains are defined in terms of the services they provide, the security they provide to the functions within their boundaries, and the connections required between a domain and other domains and networks external to the aircraft. This specification provides general design and implementation guidelines that, when they are implemented by aircraft devices and configured by the system integrator, the devices provide the required connectivity, quality of service, safety and security.