FAA HDBK-009-B PDF

This handbook provides the definitive detailed description of the Common Message Handling Protocol (CMHP) that should be used to support the software development and implementation of the protocol. In addition, it should be used as a reference document in the development of the Interface Requirement Document (IRD) and Interface Control Document (ICD) that will be developed by systems using CMHP.

CMHP is an application-level protocol developed by the FAA. It is designed for TCP/IP users. TCP/IP is a fire-and-forget protocol with no message receipt acknowledgment and little socket management. CMHP adds functionality (at the application level) that provides message-delivery assurance, regardless of the number of sockets that are traversed between end-systems.

The EPS PMO can provide CMHP source-code libraries under an "as-is" agreement to any user system that wants that to develop CMHP-based applications. The EPS PMO also provides potential users with the associated IRD and ICD to connect to the NADIN MSN, WMSCR, and ADAS.

This handbook describes how CMHP is implemented. It also provides the conformance test plan that the EPS PMO arranges to conduct with new user systems that want to connect to WMSCR, ADAS, or NADIN and who want to use CMHP features.

The scope of this handbook is restricted to the latest version of CMHP (v1.3), its predecessors CMHP v1.2 and CMHP v1.1, and obsoletes CMHP v1.0. The scope is further restricted to CMHP use over Transmission Control Protocol/Internet Protocol (TCP/IP).

Note: This handbook discusses the base functionality defined as part of CMHP v1.1. Any new functionality defined by CMHP v1.2 and CMHP v1.3 is called out explicitly.

This handbook provides:

• An overview of CMHP 
• A description of the functions CMHP provides 
• A technical description of CMHP message elements 
• The CMHP conformance test plan, which includes an overview of the test cases and a strategy to execute them.

This handbook is for guidance only and cannot be cited as a requirement.