What is BS EN 14776- Telemetry and telecommand packet utilization about?  
BS EN 14776 is one of the series of space standards intended to be applied together for the management, engineering, and product assurance in space projects and applications.
BS EN 14776 addresses the utilization of telecommand packets and telemetry source packets for the purposes of remote monitoring and control of subsystems and payloads. BS EN 14776 does not address mission-specific payload data packets, but the rules contained herein can be extended to suit the requirements of any mission.
BS EN 14776 does not address audio and video data as they are not contained within either telecommand or telemetry source packets.
BS EN 14776 is applicable to any mission, no matter what its domain of application, orbit or ground station coverage characteristics. However, it is not the intention that the PUS is applicable to a given mission in its entirety. The operational concepts and corresponding services contained in BS EN 14776 cover a wide spectrum of operational scenarios and, for a given mission, only a subset of these operational concepts and services is appropriate.
Who is BS EN 14776 - Telemetry and telecommand packet utilization for? 
BS EN 14776 on telemetry and telecommand packet utilization is useful for: 
- Quality control personnel for spacecraft products      
- Aeronautical engineers 
- Manufacturers of space equipment
- Aerospace engineers
- Space researchers
- Space regulatory bodies
Why should you use BS EN 14776 - Telemetry and telecommand packet utilization?  
ECSS-E-50 and the CCSDS recommendations for packet telemetry and telecommand address the end-to-end transport of telemetry and telecommand data between user applications on the ground and application processes on-board the satellite, and the intermediate transfer of these data through the different elements of the ground and space segments.
BS EN 14776 complements these standards by defining the application-level interface between ground and space, in order to satisfy the requirements of electrical integration and testing and flight operations.
Using the specification of services as outlined in BS EN 14776, users will be able to understand and adapt to the expectation that different missions require different levels of complexity and functionality from a given service. BS EN 14776 helps identifying a number of standard services that can be provided by one or more application processes.
