MIL-STD-188-176 Asynchronous Transfer Mode ATM, Standardized Profile for No S/S DocumentThe purpose of this military standard MIL-STD is to provide a profile of applicable standards to be used by all Department of Defense DOD activities and associated organizations when acquiring asynchronous transfer mode ATM products, systems, or services.

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MIL-STD-188-176

5.1.1.7 DS-1 physical layer interface . This section provides a 1.544-Mbps interface based on AF-PHY-0016.0000.

5.1.1.7.1 TC sublayer for DS1 interface . The TC sublayer shall provide the functions of ATM cell mapping, cell rate decoupling, cell delineation, and HEC generation/verification, in accordance with AF-PHY-0016.000, sections 3 and 4. The frame format shall be the 24-frame multiframe extended superframe

format (ESF).

5.1.1.7.2 PMD sublayer for DS1 interface . The DS-1 interface shall be in accordance with AF-PHY-0016.000, section 2.

5.1.1.8 Satellite physical layer interface . It is anticipated that satellites will play a significant role in DISN. However, standards to accommodate the high BERs and delays for

ATM over satellites are not yet available.

NOTE: The ATM Forum is developing additional physical layer interfaces. These physical layer interfaces may be used when approved, and will be cited in later versions of this MIL-STD.

5.1.2 ATM layer . The ATM layer provides connection- oriented sequence preserving service to the higher layers by assigning connection identifiers to each link of a connection when required, and releasing them when no longer needed. The ATM

layer uses ATM connections to provide its service. Signaling and user information are carried on separate ATM layer connections. The ATM layer provides its users with multiple types of communications services, such as unidirectional point-to- multipoint communications, and bidirectional asymmetrical point- to-point communications. The ATM layer includes support for the control and user planes, and for ATM layer management. The ATM layer shall be implemented in accordance with AF UNI specification, section 3, except that the referenced letter ballot, T1 LB310, shall be replaced with the approved and published standard, ANSI T1.627.

5.1.2.1 ATM cell structure and encoding at UNI . ATM cell header format and encoding at UNI shall be as specified in the AF UNI specification, section 3.3.

5.1.2.2 ATM layer functions . ATM layer functions shall be in accordance with AF UNI specification, section 3.4.

5.1.2.3 ATM layer management functions . ATM layer management functions shall be in accordance with the AF UNI specification, section 3.5.