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This article describes Bandwidth Allocation in the PON network and highlights the advantages of Dynamic Bandwidth Allocation (DBA). A well-defined DBA algorithm can significantly improve network performance, provide a means of flexibly tailoring network responsiveness and enable a service provider to generate more revenue from their FTTH networks without boosting raw bandwidth by increasing the percentage of acceptable oversubscription.
A GPON Bandwidth Allocation algorithm allows the Optical Line Terminal (OLT) to control upstream bandwidth allocation to the Optical Network Terminals (ONT). This article compares currently available Bandwidth Allocation methods and their impact on the service provided to the subscriber. By simulating a real-life TCP download scenario, it shows that Status Reporting (SR) DBA is a superior tool to provide a high level of quality of service.
When using Static Bandwidth Allocation or Non-Status Reporting (NSR) DBA, operator visibility into the upstream channel is limited. The PON access network can easily turn into a bottleneck, limiting overall network performance, as the inability to control upstream latency can result in latencies of 10mS and longer in the upstream channel alone. In addition, packet loss is inevitable using NSR DBA. As a result, the operator cannot oversubscribe the network, cannot provide symmetrical 100 Mbps services and cannot maximize its revenue potential.
SR-DBA provides excellent visibility into the upstream channel. When using SR DBA, tight control reduces upstream latency by 90% and limits it to the 1mS range, enabling symmetrical services at 100 Mbps and beyond. The SR-DBA supports oversubscription and can allocate bandwidth equivalent to 5 Gbps and beyond, leveraging the traffic burstiness characteristics.
About PMC
PMC-Sierra is a leading provider of high-speed broadband communications and storage semiconductors and MIPS-Powered processors for Enterprise, Access, Metro Optical Transport, Storage Area Networking and Wireless network equipment. The company offers worldwide technical and sales support, including a network of offices throughout North America, Europe and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol and is included in the S&P 500 Index.
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The Importance of Dynamic Bandwidth Allocation in GPON Networks
This article describes Bandwidth Allocation in the PON network and highlights the advantages of Dynamic Bandwidth Allocation (DBA). A well-defined DBA algorithm can significantly improve network performance, provide a means of flexibly tailoring network responsiveness and enable a service provider to generate more revenue from their FTTH networks without boosting raw bandwidth by increasing the percentage of acceptable oversubscription.
A GPON Bandwidth Allocation algorithm allows the Optical Line Terminal (OLT) to control upstream bandwidth allocation to the Optical Network Terminals (ONT). This article compares currently available Bandwidth Allocation methods and their impact on the service provided to the subscriber. By simulating a real-life TCP download scenario, it shows that Status Reporting (SR) DBA is a superior tool to provide a high level of quality of service.
When using Static Bandwidth Allocation or Non-Status Reporting (NSR) DBA, operator visibility into the upstream channel is limited. The PON access network can easily turn into a bottleneck, limiting overall network performance, as the inability to control upstream latency can result in latencies of 10mS and longer in the upstream channel alone. In addition, packet loss is inevitable using NSR DBA. As a result, the operator cannot oversubscribe the network, cannot provide symmetrical 100 Mbps services and cannot maximize its revenue potential.
SR-DBA provides excellent visibility into the upstream channel. When using SR DBA, tight control reduces upstream latency by 90% and limits it to the 1mS range, enabling symmetrical services at 100 Mbps and beyond. The SR-DBA supports oversubscription and can allocate bandwidth equivalent to 5 Gbps and beyond, leveraging the traffic burstiness characteristics.
About PMC
PMC-Sierra is a leading provider of high-speed broadband communications and storage semiconductors and MIPS-Powered processors for Enterprise, Access, Metro Optical Transport, Storage Area Networking and Wireless network equipment. The company offers worldwide technical and sales support, including a network of offices throughout North America, Europe and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol and is included in the S&P 500 Index.
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