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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).
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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.
Any UA system supporting data rates over 10Mb/s will implement and support CDL version F. This
includes the current UA systems: Shadow 200, Pioneer, MQ-1 Predator, MQ-9 Predator, and Global
Hawk.
Link 16
Link 16 is an encrypted, jam-resistant, nodeless tactical digital data link network established by joint
tactical information distribution system (JTIDS)-compatible communication terminals that transmit and
receive data messages in the tactical data information link (TADIL) J message catalog. Link 16 can
provide a range of combat information in near-real time to U.S. and NATO allies’ combat aircraft and C2
centers. The TADIL J messages and protocols are defined in STANAG 5516, while the communication
element is defined in STANAG 4175. Operating procedures are defined in allied data publication-16
(ADatP-16) or alternatively in the joint multi-TADIL operating procedures (JMTOP) (Chairman Joint
Chiefs of Staff Manual CJCSM 6120.01.
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Military Satellite Communications
Military satellite communications (MILSATCOM) systems include those systems owned or leased and
operated by DoD and those commercial satellite communications (SATCOM) services used by DoD. The
basic elements of satellite communications are a space segment, a control segment, and a terminal
segment (air, ship, and ground). An implementation of a typical satellite link will require the use of
　
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