barcode generator in vb.net codeproject Addressing and Signaling in ATM in Software

Make Code39 in Software Addressing and Signaling in ATM

Addressing and Signaling in ATM
Code 39 Full ASCII Decoder In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing Code 39 In None
Using Barcode generator for Software Control to generate, create Code 39 Extended image in Software applications.
ATM is a connection-oriented, virtual circuit technology, meaning that communication paths are created through the network prior to actually sending traffic. Once established, the ATM cells are routed based upon a virtual circuit address. A virtual circuit is simply a connection that gives the user the appearance of being dedicated to that user, when in point of fact the only thing that is actually dedicated is a time slot. This technique is generically known as label-based switching and is accomplished through the use of routing tables in the ATM switches that designate input ports, output ports, input addresses, output addresses, and quality of service parameters required for proper routing and service provisioning. As a result, cells do not contain explicit destination addresses, but rather contain time slot identifiers. Every virtual circuit address has two components, as shown in Figure 5-8. The first is the virtual channel (VC), which is a unidirectional conduit for the transmission of cells between two endpoints. For example, if two parties are conducting a videoconference, they will each have a VC for the transmission of outgoing cells that make up the video portion of the conference. The second level of the ATM addressing scheme is called a virtual path (VP). A VP is a bundle of VCs that have the same endpoints, and that when
ANSI/AIM Code 39 Decoder In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Generating Code 39 Extended In C#.NET
Using Barcode creator for .NET framework Control to generate, create Code 39 Extended image in .NET framework applications.
Figure 5-8 Virtual paths and virtual channels in ATM.
Code-39 Creation In VS .NET
Using Barcode generator for ASP.NET Control to generate, create ANSI/AIM Code 39 image in ASP.NET applications.
Encoding Code 39 In .NET Framework
Using Barcode maker for .NET framework Control to generate, create USS Code 39 image in Visual Studio .NET applications.
Virtual Channel Bi-directional Virtual Path Virtual Channel
Print USS Code 39 In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create USS Code 39 image in Visual Studio .NET applications.
EAN 128 Creator In None
Using Barcode generator for Software Control to generate, create EAN128 image in Software applications.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
ANSI/AIM Code 128 Encoder In None
Using Barcode drawer for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
UPC-A Supplement 5 Creation In None
Using Barcode generation for Software Control to generate, create UPC Code image in Software applications.
Asynchronous Transfer Mode (ATM)
Code 3/9 Creation In None
Using Barcode creation for Software Control to generate, create Code 39 Extended image in Software applications.
Painting EAN-13 Supplement 5 In None
Using Barcode maker for Software Control to generate, create EAN 13 image in Software applications.
5
Identcode Printer In None
Using Barcode printer for Software Control to generate, create Identcode image in Software applications.
Creating GTIN - 128 In None
Using Barcode printer for Font Control to generate, create EAN 128 image in Font applications.
considered together make up a bi-directional transport facility. The combination of unidirectional channels that we need in our two-way videoconferencing example makes up a VP.
Barcode Drawer In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
Code 128 Maker In Java
Using Barcode encoder for Java Control to generate, create Code 128A image in Java applications.
ATM Signaling
Paint Data Matrix In Java
Using Barcode maker for Java Control to generate, create Data Matrix image in Java applications.
Painting GS1 - 13 In Java
Using Barcode drawer for Java Control to generate, create EAN13 image in Java applications.
Signaling in ATM is similar to that used in ISDN and is a subset of the preexisting ISDN signaling standards. Whereas ISDN uses Q.931 signaling, ATM relies on a subset of Q.931 called Q.2931, which defines signaling packets that establish, maintain, and release VPs and VCs, and negotiate traffic characteristics for each connection at the time that they are established. The ATM signaling procedures define three types of signaling virtual channels (SVCs):
Making USS-128 In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create GS1 128 image in Visual Studio .NET applications.
Scanning UPC Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Meta-Signaling Virtual Channel (MSVC): The MSVC is a bidirectional permanent channel that is used to create and tear down the temporary SVCs created by users to transfer data. Each interface has one MSVC; the channel is permanent because it must be available so that the switch can signal to the CPE about the status of an incoming call. Signaling Virtual Channel (SVC): This is used for the exchange of actual signaling messages. General Broadcast Signaling Virtual Channel (GBSVC): A channel used by the network to announce an incoming call at all appropriate devices at an interface.
The ATM Cell Header
As we mentioned before, ATM is a cell-based technology that relies on a 48octet payload field that contains actual user data and a five-byte header that contains information needed by the network to route the cell and provide proper levels of service. The ATM cell header, shown in Figure 5-9, is examined and updated by each switch it passes through, and comprises six distinct fields: the Generic Flow Control Field, the Virtual Path Identifier, the Virtual Channel Identifier, the Payload Type Identifier, the Cell Loss Priority Field, and the Header Error Control Field, which are described in the following list:
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Asynchronous Transfer Mode (ATM)
Asynchronous Transfer Mode (ATM)
Figure 5-9 ATM cell header.
Generic Flow Control (GFC): This four-bit field is used across the UNI for network-to-user flow control. It has not yet been completely defined in the ATM standards, but some companies have chosen to use it for very specific purposes. For example, Australia s Telstra Corporation uses it for flow control in the network-to-user direction and as a traffic priority indicator in the user-to-network direction. Virtual Path Identifier (VPI): The eight-bit VPI identifies the virtual path over which the cells will be routed at the UNI. It should be noted that because of dedicated, internal flow control capabilities within the network, the GFC field is not needed across the NNI. It is therefore redeployed, as shown in Figure 5-10; the four bits are converted to additional VPI bits, thus extending the size of the virtual path field. This provides the identification of more than 4,000 unique VPs. At the UNI, this number is excessive, but across the NNI it is necessary because of the number of potential paths that might exist between the switches that make up the fabric of the network. Virtual Channel Identifier (VCI): As the name implies, the 16-bit VCI identifies the unidirectional virtual channel over which the current cells will be routed. Payload Type Identifier (PTI): The three-bit PTI field is used to indicate network congestion and cell type, in addition to a number of
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Asynchronous Transfer Mode (ATM)
Copyright © OnBarcode.com . All rights reserved.