MPOA Architecture Multi-Protocol over ATM MPOA
B. AAL1 Structure
The Nx64 operation uses the AAL1 Structured Data Transfer SDT mode as described in ITU-T I.363.1. The AAL1 format used for the CES operation is shown in Figure 9-19. When N=1 i.e., the SDT block carries only one time slot, the AAL1 block pointer is not needed. In this case, the Non-Pointer Non-P format with 47-octet payload is used. When N 1, the Pointer P format with 46-octet payload is used. The 1-octet SAR PDU header contains a 4-bit Sequence Number SN field and a 4-bit Sequence Number Protection SNP field. The SN field includes a 1-bit Convergence Sublayer Indicator CSI to indicate the existence of a Convergence Sublayer and a 3-bit Sequence Counter SC to make sure that the SAR PDUs are received at a destination in the proper order they are sent from a source. The SNP field contains a 3-bit CRC and 1-bit even parity fields to provide error detection and correction for the SN field. When operating in the basic structured mode without CAS signaling, a block is formed by combining the time-slots belonging to this particular Nx64 channel in the order they are received from the physical PDH interface in a single frame. This format is shown in Figure 9-20. When the Structured with CAS mode is used, the SDT payload is divided into two subsections: the first section contains time slots corresponding to this Nx64 channel from the multiframe PDH data; the second section contains the CAS signaling A, B, C, and D signaling bits for these time-slots. This format is illustrated in Figure 9-20.C. Timing
There are two methods defined for synchronization between source and the destination CBR devices: synchronous and asynchronous clocking modes. In the synchronous clocking mode, both source and destination CBR end-devices attached to the CES-IS entities are synchronized to a reference clock, Primary Reference Source PRS, from the network through CES- IS entities. In the asynchronous clocking mode, both source and destination end-devices run without synchronizing to the network clock PRS. Figure 9-18 Unstructured CES-IWF protocol architecture. Figure 9-19 AAL1 format for CES.Parts
» 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
Show more