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. DETAILED REQUIREMENTS

5.1 ATM user-to-network interface . The ATM user-to-network interface consists of the physical interface, and the formats and protocols that control information flow. A profile of protocol

and interface standards for ATM is shown in Figure 7. The protocol layers applicable to the user and control planes for ATM UNI are illustrated in Figure 8. The characteristics described

in 5.1.1 through 5.1.5.2 apply to the ATM UNI.

5.1.1 Physical layer . UNI physical layer standards specified herein provide for 155.52-Mbps (optical and electrical), 100-Mbps (optical), STS-1 (electrical), DS-3, DS-1, and E1 rates. The physical layer provides transmission services to the ATM layer. The physical layer consists of two sublayers, the transmission convergence (TC) sublayer, and the physical media dependent (PMD) sublayer. The TC sublayer performs all

functions required to transform a flow of cells into a continuous flow of bits that can be transmitted and received over a physical medium. Common functions of the TC sublayer--including header error control (HEC), header sequence generation/verification, and cell delineation--are specified in ITU-T I.432. These and other TC sublayer functions, including transmission frame adaptation

and transmission frame generation/recovery, are specified below. The PMD sublayer includes only physical-medium-dependent functions, including line coding, bit timing, and bit transmission over the physical medium.

5.1.1.1 SONET STS-3c physical layer interface . This interface provides a 155.52-Mbps ATM network access.

5.1.1.1.1 TC sublayer for SONET STS-3c . The TC sublayer shall perform the functions of HEC generation/verification, cell scrambling and descrambling, cell mapping, cell delineation, and ATM payload construction indication, as specified in the ATM UNI specification, section 2.1.1.2.

5.1.1.1.2 PMD sublayer for SONET STS-3c . The 155.52-Mbps physical medium interface may be an optical, an unshielded

twisted pair, or a shielded twisted pair interface.

5.1.1.1.2.1 SONET-based STS-3c optical interface . The PMD

sublayer for the optical SONET STS-3c shall be as specified in

the ATM UNI specification, section 2.1.1.1.