PMD Sub-layer The Physical Layer
A. ATM Layer Functions
The ATM layer provides a variety of functions, such as: 1 Connection Admission Control CAC including connection assignment and removal 2 Cell construction, reception and header validation 3 Cell payload type discrimination 4 Cell relaying, copying and forwarding using the VPIVCI 5 Cell multiplexing and demultiplexing using the VPIVCI 6 Cell loss priority processing 7 Usage parameter control UPC 8 Support for multiple QOS classes 9 Generic flow control GFC 10 Feedback controls through Operation And Maintenance OAM 11 Explicit Forward Congestion Indication EFCI Figure 5-7 Idle cell format for cell rate decoupling at the TC sub-layer. ATM layer is where the cell headers are actually built. The ATM network nodes act based on that information. The VPI and VCIs are interpreted at the ATM layer so that the cell can be sent to the proper destination across the network. The mixing of cells for voice, video and data on the UNI also takes place at this layer which are then separated at the destination. As discussed in Chapter 6, construction of a virtual path VP and virtual channel VC is a key concept in ATM. In general, an ATM device may be either a connecting point or an endpoint for a VP or VC. As shown in Figure 5-11, a virtual path connection VPC or a virtual channel connection VCC can existParts
» ATM Technology for Broadband Telecommunications
» Ongoing ATM Standardization Activities A. Current Standardization Activities in ITU-T
» Scale of Investment Characterization of Broadband Telecommunications Market
» Scale of Market Size and Reward Regulatory Conditions Customer Driven Factors
» Residential Market Market Analysis for ATM Technology
» Business Market Market Analysis for ATM Technology
» Bandwidth Cost Trend Market Analysis for ATM Technology
» Market Opportunities Market Analysis for ATM Technology
» ATM Overview Basic ATM Concepts
» Introduction Signaling in ATM Networks
» Signaling Mechanisms Signaling in ATM Networks
» ATM Cell Structure ATM Switching Concepts
» Routing Cells in ATM Networks
» Call Setup Basic ATM Concepts
» Internet Service Services Offered through ATM Networks
» Video on Demand Video Telephony Distant LearningMedicine
» Telecommuting Services Offered through ATM Networks
» Wireless Networks Integration of Various Access Node Technologies into ATM
» Public Telephone Service Networks
» Data Networks Integration of Various Access Node Technologies into ATM
» Cable-TV Networks Integration of Various Access Node Technologies into ATM
» Integration of Various Transport Technologies
» ATM Protocol Stack ATM Protocols
» PMD Sub-layer The Physical Layer
» ATM Transmission Convergence TC Layer
» ATM Layer Functions The ATM Layer
» ATM Cell Types The ATM Layer
» AAL Structure ATM Adaptation Layer AAL
» ATM Adaptation Layer Functions
» Variable Bandwidth Allocation Bandwidth Allocation in ATM Networks
» Virtual Path and Virtual Channel Concepts
» Constant Bit Rate Bandwidth Allocation in ATM Networks
» Variable Bit Rate Bandwidth Allocation in ATM Networks
» Unspecified Bit Rate Bandwidth Allocation in ATM Networks
» Available Bit Rate Bandwidth Allocation in ATM Networks
» Input Buffering Output Buffering
» Routing Models for ATM Switching Networks
» ATM Switch Architectures Switching Architectures for ATM Networks
» The Traffic Contract ATM Traffic Management: Traffic Enforcement and Traffic
» Basic Quality of Service QoS Parameters
» Connection Admission Control ATM Traffic Management: Traffic Enforcement and Traffic
» UsageNetwork Parameter Control UPC NPC
» ATM Service Categories ATM Traffic Management: Traffic Enforcement and Traffic
» Traffic Shaping ATM Traffic Management: Traffic Enforcement and Traffic
» Flow Control and Congestion Control
» LANE Architecture LAN Emulation
» LANE Components LAN Emulation User to Network Interface LUNI
» LANE Connections LAN Emulation
» Basic Operations Flow for LEC
» LANE Connection Management LAN Emulation
» LIS Configuration and Operation
» MPOA Architecture Multi-Protocol over ATM MPOA
» MPOA Operations Multi-Protocol over ATM MPOA
» Structured CES Unstructured CES
» AAL1 Structure Timing Voice and Telephony over ATM VTOA
» Queuing Model for the ATM Traffic Simulation
» ATM Traffic Model Validation of Simulation Results
» Simulation Results ATM Traffic Simulation
» ITU-T Recommendations for ATM
» ATM Forum Specifications Current Standards
» IETF’s ATM-Related RFC Standards
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