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- [ PROTOCOLS:OSDIR-4.TXT ] [ OJ, 5/86 ]
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- THE UNDER SECRETARY OF DEFENSE
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- WASHINGTON D.C 20301
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- 14 May 1984
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- 3
- (C I)
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- MEMORANDUM FOR SECRETARIES OF THE MILITARY DEPARTMENTS
- DIRECTORS OF THE DEFENSE AGENCIES
- DIRECTOR, JOINT STAFF, OJCS
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- SUBJECT: DoD Policy on Defense Data Network (DDN) Protocols
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- 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.
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- 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.
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- 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.
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- 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.
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- James P. Wade, Jr
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