MIL-STD-188-176
systems. To achieve interoperability between ATM end systems, each higher layer must have a peer in the other end system.
4.2.5.2.2 ATM adaptation layer . The AAL adapts the services provided by the ATM layer to the services required by high layers. The AAL supports both user and control plane functions, and supports information transfer between and among ATM end systems.
4.2.5.2.3 ATM layer . The ATM layer is common to all services and provides fast packet-transfer capabilities, based on a 53-byte cell. The 53-byte cell consists of a 5-byte header and a 48-byte payload.
4.2.5.2.4 Physical layer . The physical layer consists of two sublayers. The physical medium dependent (PMD) sublayer includes only physical-medium-dependent functions. The transmission convergence (TC) sublayer performs all functions required to transform a flow of cells into a flow of bits, which can be transmitted and received over a physical medium.
4.2.6 Virtual channel connections . Prior to transmission of traffic cells, a virtual channel connection (VCC) is established across the ATM network, providing a connection
between two or more ATM end points. Permanent virtual channel connections (PVCC) are set up and torn down by network managers (by means of an operational or administrative message, in response to a customer request). Switched virtual channel connections (SVCC) are established and released by using the signaling virtual channel (see 5.1.4).
4.2.7 Signaling capabilities . The signaling capabilities include the ability to control virtual channel and virtual path connections for information transfer; support communications configurations on a point-to-point and point-to-multipoint basis; negotiate or renegotiate source traffic characteristics of a connection; reconfigure already established connections; and support interworking with non B-ISDN services.
4.2.7.1 Point-to-point communications . The ATM Forum's UNI specification supports point-to-point communications. A point- to-point connection is a bidirectional connection between two end points. A point-to-point connection provides unidirectional or bidirectional asymmetric communications between parties "A" and
"B." Connections are established, modified, or released by
either party "A," "B," or an authorized third party (C or D), as
shown in Figure 5.
18
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business