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The command, control, communications, and computer systems directorate of the joint staff (J-6)
interoperability and supportability tool supported by JCPAT-E enables component program managers
(PM) to develop IT Standards Profiles IAW the DOD IT Standards Registry (DISRonline). The IT
standards profile is required as a supporting JCIDS predecessor document for capability development
document and CPDs. The standards profile generated by the DISRonline shall be submitted with its
related CDDs, and CPDs to the KM/DS during the JCIDS process, and the ISP.
The JCIDS predecessor requirement mandates the use of the J6 interoperability and supportability tool
access, use of the JCPAT-E registration number for IT and NSS, and development of IT standards profile
by component PMs.
Supported by the J-6 interoperability and supportability tool, DISR online enables system developers to
identify applicable DISR standards and provides users with an easy method to identify the applicable
DOD standards needed and to build an IT system Standards Profile through analysis of the IT and NSS
capability/system requirements. The J-6 interoperability and supportability tool may be accessed via the
SIPRNET at http://jcpat.ncr.disa.smil.mil.
Open Systems Interconnection/STANAG 4250
The NATO reference module for open systems interconnection is defined in STANAG 4250. This model
is based on the ISO open systems interconnect model, using seven layers to define the elements of the
interface protocol. The lowest level is the physical layer, defining the physical and electrical parameters
of the actual connection. The highest layer defines the support for the applications that use the data being
transported across the interface. The next part of the Standards appendix will describe standards for OSI.
NETWORK STANDARDS
The transport infrastructure is a foundation for net-centric transformation in DoD and the intelligence
community (IC). To realize the vision of a global information grid, ASD/NII has called for a dependable,
reliable, and ubiquitous network that eliminates stovepipes and responds to the dynamics of the
operational scenario— bringing power to the edge. To construct the transport infrastructure DoD will:
Follow the Internet Model
Create the GIG from smaller component building blocks
Design with interoperability, evolvability, and simplicity in mind
The Transport layer (OSI Layer 4)
The OSI reference model transport layer (layer 4) defines the rules for information exchange and manages
end-to-end delivery of information within and between networks, including making provision for error
recovery and flow control. It also repackages long messages when necessary into smaller packets for
transmission and, at the receiving end, rebuilds packets into the original message. Depending upon which
UAS ROADMAP 2005
APPENDIX E – INTEROPERABILITY STANDARDS
Page E-3
layer 4 protocol is in use, the receiving terminal’s transport layer may send acknowledgments of receipt
of packets. Two layer 4 protocols are recommended and both should be present on both the transmitting
and receiving platforms. The receiver should be able to determine which protocol the transmitting system
utilized by the information in the packet header.
User datagram protocol (UDP), IETF Standard 6, IETF RFC 768. This is a mandated standard
identified in the DISR. UDP is used when transport layer delivery assurance of packets sent over the
data link is not required (e.g., in the transmission of video frames, a condition where tolerance of
errors and/or missing frames is high and low latency is important).
Transport control protocol (TCP), IETF Standard 7, IETF RFC 793. This is a mandated standard
identified in the DISR. The TCP [RFC 761] provides a connection oriented reliable byte stream
service. TCP is a bi-directional protocol, which has no concept of messages. Any framing has to be
added at the application level. TCP contains an acknowledgement scheme which makes it reliable
(bytes are delivered correctly and in order) and which implements flow control.
The Network Layer (OSI Layer 3)
In the OSI reference model, the network layer (layer 3) provides a means for addressing messages and
translating logical addresses and names into physical addresses. It also provides a means for determining
the route from the source to the destination computer and manages traffic problems, such as switching,
routing, and controlling the congestion of data packets. The ubiquitous standard for layer 3 networking is
the Internet Protocol (IP). IP version 4 (IPv4) is currently in widespread usage. IP version 6 (IPv6) is an
emerging standard that is in development, and mandated for DoD usage with a transition completion goal
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