MIL-STD-188-176
5.1.2.4 Preassigned header field values . Preassigned virtual path indicator (VPI) and virtual channel indicator (VCI) values reserved for unassigned cells shall be in accordance with AF UNI specification, section 3.4.3.
5.1.2.5 Traffic control and congestion control . Traffic control and congestion control shall be in accordance with the AF UNI specification, section 3.6.
5.1.3 Signaling ATM Adaptation Layer (SAAL) . SAAL conveys signaling information between layer 3 entities across the UNI.
SAAL consists of two parts: a common part and a service-specific part. The service-specific part, called the service=speciiic convergence sublayer (SSCS), is divided into two sublayers: the service-specific coordination function (SSCF) and the service- specific connection-oriented protocol (SSCOP). The SSCF shall
map the services of SSCOP to the needs of the layer 3 entity, in
accordance with ANSI T1.638, sections 7 through 11. SSCOP shall
provide assured data delivery for the signaling PDUs by means of
selective retransmission, in accordance with ANSI T1.637,
sections 6 through 8. SSCOP uses the services of the common part
protocol, the SAR and CPCS, which shall be in accordance with
ITU-T I.363, section 6.
5.1.4 UNI signaling . Signaling at the UNI shall be in accordance with the AF UNI specification, section 5. The signaling function supports point-to-point and point-to- multipoint network connections. ATM signaling permits users on
B-ISDN to connect to users on N-ISDN. ATM signaling also permits users on different N-ISDNs to interconnect via B-ISDN
(see 5.5.2.1).
5.1.4.1 Connection control . Connection at the UNI shall be in accordance with the AF UNI specification. The AF UNI specification provides deviations from ITU-T Q.2931, which
specifies the procedures for establishing, maintaining, and clearing point-to-point connections at the ATM UNI.
5.1.4.2 Addressing . UNI signaling shall support the address formats specified in AF UNI specification, section 5.1.3 and Annex A. For the Defense Information System Network, the numbering plan specified in DCAC 370-175-13, the section titled DSN Worldwide Numbering and Dialing Plan (WNDP), shall be supported.
5.2 ATM adaptation layer (AAL) . The AAL supports user plane functions and information transfer between and among ATM end systems. Several AAL protocols are available to support different types of users. The AAL is subdivided into sublayers, as shown in Figure 7. The common part (CP) sublayer consists of
29
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business