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osdir-4.txt
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[ PROTOCOLS:OSDIR-4.TXT ] [ OJ, 5/86 ]
THE UNDER SECRETARY OF DEFENSE
WASHINGTON D.C 20301
14 May 1984
3
(C I)
MEMORANDUM FOR SECRETARIES OF THE MILITARY DEPARTMENTS
DIRECTORS OF THE DEFENSE AGENCIES
DIRECTOR, JOINT STAFF, OJCS
SUBJECT: DoD Policy on Defense Data Network (DDN) Protocols
Under secretary of Defense (Research and Engineering) Memorandum
"Defense Data Network (DDN) Implementation", dated 10 March 1983
prohibited the use of X.25 connections to the DDN until the DDN X.25
specifications had been approved by the DoD Protocol Standards Steering
Group (PSSG). The DDN X.25 specification has been approved by the PSSG
and it is hereby authorized for use on the DDN.
The requirement to use the DoD Standard Host-to-Host Transmission
Control and Internet Protocols (TCP/IP) promulgated by USDRE Memorandum,
"DoD Policy on Standardization of Host-to-Host Protocols for Data
Communications Networks," 23 March 1982, remains in effect.
With the approval of the DDN X.25 specification in the Defense
Communications Agency (P&SI) Memorandum, "DDN X.25 Specification",
4 January 1984, the DoD has taken another step toward standardized
data communication protocols, along with industry and the international
community. Since the use and availability of the X.25 protocol is
widespread, every effort should be made to bring DoD in line with all the
data communications users in this area. The DDN X.25 will be used as the
access protocol; TCP and IP will continue to be used as the internet
and transport layers. The 1822 protocol will continue to be supported by
the DDN until phased out via evolution.
All new systems and systems undergoing major redesign are
required to use levels 2 and 3 of the DDN standard X.25 protocol for
interfacing to the DDN. Case-by-case waivers will be considered by
Assistant Secretary of Defense (C3I). The on-going I-S/A AMPE and
BLACKER programs are specifically requested to take steps to implement
the DDN Standard X.25 specification as early as possible.
James P. Wade, Jr