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The fundamental benefits of PON technology include flexibility, reliability, and simplicity Their deployment eliminates active network components, such as amplifiers, switches, or regenerators from in-field locations, thus adding to the robustness, simplicity, and reliability of the structure In EPON architecture, all active network components are placed at the ends of the fiber line and all in-field devices are completely passive, data rate transparent, and typically environmentally hardened, featuring mainly passive splitter combiners (PSCs) These splitters fit into standard splice enclosures and can be conveniently installed with the cable, providing little maintenance, if any Environmentally controlled vaults (CEVs), required in DSL and other copper technology deployments are thus eliminated, thus no air conditioning systems, large pedestals, commercial powering, backup power systems as well as time-consuming technician dispatches are required EPON networks also employ bidirectional communications over a single fiber cable, thus reducing the amount of required fiber deployment by approximately 50 percent and providing a more cost-effective fiber structure for the network operator In case of service providers with exhausted fiber capacity, EPON systems enable the reclamation of capacity through better fiber utilization, allowing for service provision for greater numbers of subscribers A single fiber strand can, therefore, provide connectivity to as many as 16/32 customers at a distance of up to 20 km, in accordance with the IEEE 8023ah standard The smaller the network diameter, the greater the number of customers, thus typical upgrades from P2P Ethernet links to EPON systems result in a fiber structure capable of supporting more than 32 customers at a time The only shortcomings of the presented EPON system stem inherently from its advantages ie, relaxed PHY requirements Lower grade lasers and receiver modules as well as the application of 8B/10B channel encoding result in increased transmission overhead when compared with competitive ITU G984 GPON systems This fact has been recognized by the EPON proponents though it has been argued that the increased channel efficiency of GPONs comes with a much higher price tag, leading to less costeffective solution It is therefore difficult to identify whether the said relaxed PHY specifications are indeed disadvantageous for EPONs or whether they were originally the enabling factor for the wide adoption of the said system and its robustness
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The EPON is a point-to-multipoint (P2M) network, with a single CO providing services to a number of residential/business customers All transmissions in the EPON system are performed between the OLT and ONUs, where the OLT is typically a blade in a CO chassis, while the ONUs are more commonly deployed as stand-alone boxes, with their exact location depending on the deployment scenario (home for FTTH, curb in FTTC, business office in FTTB see Figure 71 for details) Both active components also have other functions The OLT connects the optical access network to the metropolitan area network (MAN) or wide area network (WAN),
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Dro sect p ion
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Figure 71 Standard EPON deployment with various scenarios of FTTx solution: FTTB, FTTC, FTTH, and mixed FTTH
typically termed backbone while ONUs typically aggregate traffic streams from individual subscribers and prepare them for transmission toward the OLT ONUs additionally employ packet-prioritization mechanisms or scheduling, enabling full QoS support and enforcement of service-level agreements (SLAs) between the Internet service provider (ISP) and the end subscribers The OLT typically employs complex mechanisms responsible for bandwidth allocation in the shared upstream channel as well as a number of agents dealing with registration of new subscriber units in the network, ranging, link control, and so on Several multipoint topologies have been suggested for the access network, including tree, tree-and-branch, ring, or bus (see Figure 72 ) Use of 1 2 optical tap couplers and 1 N optical splitters allows for virtually any deployment architecture, thus making EPONs a very flexible architecture capable of meeting any requirements in terms of providing connectivity for end subscribers
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