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

TABLE I. SONET/SDH Signal Hierarchy .

OC-LEVEL

SONET DESIGNATION

SDH DESIGNATION

BIT RATE (Mbps)

PAYLOAD RATE (Mbps)

OC-1

STS-1

51.84

50.112

OC-3

STS-3

STM-1

155.52

150.336

OC-12

STS-12

STM-4

622.08

601.344

OC-48

STS-48

STM-16

2488.32

2405.376

5.3.2.1 ATM cell header format and encoding at NNI . ATM

cell header format and encoding at the NNI shall be as specified

in ANSI T1.627, section 12.2.2.

5.3.2.2 ATM layer functions . ATM layer functions shall be in accordance with ANSI T1.627, section 10.

5.3.2.3 ATM layer management functions . ATM layer management functions shall be in accordance with ANSI T1.627, sections 9 and 11.

5.3.3 SAAL at the NNI . The SAAL at the NNI is the same as at the UNI (see 5.1.3) except for the SSCF. The SSCF at the NNI shall map the particular requirements of the NNI layer 3 protocol to the SSCOP services, in accordance with ANSI T1.645.

5.3.4 ATM network layer . For Government-owned WANs, signaling at the NNI shall be in accordance with ITU-T Q.2764, as indicated in Figure 8. Interworking between UNI signaling and

B-ISUP (ITU-T Q.2764) shall be in accordance with ITU-T Q.2650. When leasing WAN services, the requirement to comply with ITU-T Q.2650 and Q.2764 may be waived.

5.4 Base ATM network . The standards for the base ATM network are based on standards for private ATM networks. The interface between base ATM switches is referred to as the private network-node interface (P-NNI). In the user plane, the P-NNI consists of a physical layer and an ATM layer (see sections 5.1.1 and 5.1.2). The control plane, which also includes a network layer, is shown in Figure 9. Signaling in the base ATM network shall be in accordance with the AF P-NNI signaling specification. It is a modified version of the AF UNI specification section 5, which is based on Q.2931 and denoted in Figure 9 as Q.2931*. The AF P-NNI signaling specification applies to signaling between

base ATM switches.