ATM Physical Layer in Java

Generate Denso QR Bar Code in Java ATM Physical Layer
592 ATM Physical Layer
QR Generation In Java
Using Barcode creator for Java Control to generate, create QR Code JIS X 0510 image in Java applications.
The physical layer is concerned with sending an ATM cell over a single physical link As shown in Figure 59-2, the physical layer has two sublayers: the Physical Medium Dependent (PMD) Sublayer and the Transmission Convergence (TC) Sublayer Sublayer Transmission Convergence (TC) Sublayer Physical Medium Dependent (PMD) Sublayer Responsibilites Idle Cell Insertion Cell Delineation Transmission Frame Adaptation Physical Medium Bit voltages and timings Frame structure
Creating Bar Code In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
Figure 59-2: The two sublayers of the physical layer, and their responsibilities The Physical Medium Dependent Sublayer The PMD sublayer is at the very bottom of ATM protocol stack As the name implies, the PMD sublayer depends on the physical medium of the link; in particularly, the sublayer is specified differently for different physical media (fiber, copper, etc) As shown in the above chart, it specifies the medium itself It is also responsible for generating and delineating bits There are two classes of PMD sublayers: PMD sublayers which have a transmission frame structure (eg, T1, T3, SONET, or SDH) and PMD sublayers which do not have a transmission frame structure If the PMD has a frame structure, then it is responsible for generating and delineating frames (The terminology "frames" in this section is not to be confused with link-layer frames used in the earlier sections of this The transmission frame is a
Barcode Recognizer In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
file:///D|/Downloads/Livros/computa o/Computer%20NetDown%20Approach%20Featuring%20the%20Internet/atmhtml (3 of 10)20/11/2004 15:52:43
Make Denso QR Bar Code In C#.NET
Using Barcode generator for VS .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
physcial-layer mechanism for organizing the bits sent on a link) The PMD sublayer does not recognize cells Some possible PMD sublayers include: 1 SONET/SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) over single-mode fiber Like T1 and T3, SONET and SDH have frame structures which establish bit synchronization between the transmitter and receiver at the two ends of the link There are several standardized rates, including: r OC-1: 5184 Mbps r OC-3: 15552 Mbps r OC-12: 62208 Mbps 2 T1/T3 frames over fiber, microwave, and copper 3 Cell based with no frames In this case, the clock at receiver is derived from transmitted signal Transmission Convergence Sublayer The ATM layer is specified independently of the physical layer; it has no concept of SONET, T1, or physical media A sublayer is therefore needed (1) at the sending side of the link to accept ATM cells from the ATM layer and put the cells' bits on the physical medium, and (2) at the receiving side of the link to group bits arriving from the physcial medium into cells and pass the cells to the ATM layer These are the jobs of the TC sublayer, which sits on top of the PMD sublayer and just below the ATM layer We note that the TC sublayer is also physical medium dependent -- if we change the physical medium or the underlying frame structure, then we must also change the TC sublayer On the transmit side, the TC sublayer places ATM cells into the bit and transmission frame structure of the PMD sublayer On the receive side, it extracts ATM cells from the bit and transmission frame structure of the PMD sublayer It also peforms header error correction (HEC) More specifically, the TC sublayer has the following tasks:
Generating QR Code In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
At the transmit side, the TC sublayer generates the HEC byte for each ATM cell that is to be transmitted At the receive side, the TC sublayer uses the HEC byte to correct all one-bit errors in the header and some multiple-bit errors in the header, reducing the possibility of incorrect routing of cells (The HEC is created by dividing the first 32 bits of the header by the polynomial x8+x2+x +1 and then taking the 8-bit remainder) At the receive side, the TC sublayer delineates cells If the PMD Sublayer is cell based with no frames, then this is typically done by running the HEC on all contiguous sets of 40 bits (ie, 5 bytes) When a match occurs, a cell is delineated Upon matching four consecutive cells, cell synchronization is declared and subsequent cells are passed to the ATM layer If the PMD sublayer is cell based with no frames, the sublayer sends an idle cell when ATM layer has not provided a cell, thereby generating a continuous stream of cells The receiving TC sublayer does not pass idle cells to the ATM layer Idle cells are marked in the PT field in the ATM header
Paint Denso QR Bar Code In .NET Framework
Using Barcode generation for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
file:///D|/Downloads/Livros/computa o/Computer%20NetDown%20Approach%20Featuring%20the%20Internet/atmhtml (4 of 10)20/11/2004 15:52:43
QR Code Generator In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Make Barcode In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
Creating Data Matrix 2d Barcode In Java
Using Barcode generator for Java Control to generate, create Data Matrix image in Java applications.
USS Code 39 Creator In Java
Using Barcode generation for Java Control to generate, create Code-39 image in Java applications.
Drawing Bar Code In .NET
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Creating USS Code 128 In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create USS Code 128 image in .NET framework applications.
Decode Data Matrix In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
Code-39 Creator In C#
Using Barcode generation for VS .NET Control to generate, create Code-39 image in Visual Studio .NET applications.