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Generic Framing Procedure (GFP)
Standards Profile compliant systems will as a minimum implement international telecommunications union (ITU) generic framing procedure as defined in the CDL waveform specifications appendix II,
4 Defined in Waveform Specification for the Common Data Link (CDL), Specification Number 7681990, Revision F, available through the Air Force Aeronautical Systems Center (ASC/RAJD).
APPENDIX E – INTEROPERABILITY STANDARDS
Page E-5
annex B. GFP provides a simple and highly efficient means of transmitting asynchronous Ethernet (and other framing procedures) over the synchronous CDL channel. The key to GFP efficiency is derived from the means utilized to identify the start of data frames in the continuous serial bit stream received over CDL.
Media Access Control Addressing
Interoperability profile compliant systems will implement media access control addressing as defined in the CDL waveform specifications, appendix II, and annex B.
External Network Interface
The Ethernet port is expected to facilitate “plug and play” interconnection and interoperation of systems with Ethernet-based local area networks on board aircraft and surface vessels.
Interoperability Outside the Data Link
Defense transformation, and more specifically the development of the GIG, is built on the concept of information system networking. CDL systems have the potential for being connected to the edge of the GIG, and for this reason networking capabilities are being implemented in CDL-based transmission systems. Networking capabilities, although they may be considered as operationally integral to a particular CDL system, actually are implemented through standards, protocols, and methods external to the data link itself (i.e., at layers 3 through 7 of the OSI networking model). Networking standards are an important consideration in the overall interoperability of UA systems and are discussed in the previous Section. Systems will as a minimum implement a user interface based on IP packets and IP addressing as needed to support the specific program network addressing requirements. Implementation of IP and IP addressing should conform to the CDL waveform specifications, appendix II.
CDL will have an expanding role as the intelligence community and the entire DOD migrate toward network-centric warfighting capabilities. Although CDL has been used traditionally as a point-to-point ISR data link, the CDL waveform standard revision F, along with future revisions, will include the necessary networking and interface standards to better assure end-to-end interoperability. Improved ISR end-to-end interoperability facilitates integration across all ISR assets supporting the warfighter.
In parallel, the U.S. has cooperated with NATO to develop STANAG 7085 which embodies the CDL specification. Additionally, it should be noted that STANAG 7085/CDL is a key component of interoperability for CIGSS/DCGS.
While the CDL specification and STANAG 7085 define the basic requirements for interoperability, the numerous options available within the standard allow for non-interoperable implementations that are all compliant. A set of profiles is being developed within the NATO community to provide more specific guidance for users of CDL systems. Developers will adopt one of the profiles whenever possible to minimize the proliferation of compliant, but non-interoperable data link systems.
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无人机系统路线图 Unmanned Aircraft Systems Roadmap(152)
