By Nirwan Ansari
This ebook makes a speciality of numerous Passive optical networks (PONs) varieties, together with presently deployed Ethernet PON (EPON) and Gigabit PON (GPON) in addition to subsequent new release WDM PON and OFDM PON. additionally this publication examines the built-in optical and instant entry networks. focusing on matters in those networks: media entry keep watch over (MAC) and source allocation. those difficulties can tremendously have an effect on performances of PONs akin to community source usage and QoS of finish clients. ultimately this e-book will speak about quite a few recommendations to deal with the MAC and source allocation matters in a variety of PON networks.
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Additional info for Media Access Control and Resource Allocation: For Next Generation Passive Optical Networks
As indicated in Fig. 4, the time gap is at least two round-trip times (RTTs) between the ONU and the OLT. To better utilize the bandwidth, Kramer et al.  proposed interleaved polling with adaptive cycle time (IPACT). As a seminal work in EPON DBA, IPACT interleaves polling messages with Ethernet frame transmission, as shown in Fig. 5. It reduces the overhead arisen from 34 4 Media Access Control and Resource Allocation in EPON and 10G-EPON Idle time rt repo repo t g ONU 1 gran pollin g t llin gran po rt OLT ONU 2 Fig.
Symmetric 10G-PON, referred to as XG-PON2, achieves 10 Gbit/s in both upstream and downstream. However, XG-PON2 requires cost-inefficient burstmode transmitters at ONU sides to deliver the upstream transmission speed. When devices capable of a 10 Gb/s burst mode become commercially available, the architecture with both the downstream and upstream transmission being upgraded to 10 Gb/s can be realized (see Fig. 3b). 3ah) EPON is developed based on Ethernet technologies, and enables seamless integration with IP and Ethernet technologies .
On the other hand, the VBR characteristic induces either excessive or inadequate bandwidth provision when the application is mapped into TCONT type 1. For the sake of bandwidth efficiency and QoS provisioning, it is proper to map such traffic into TCONT type 3. For TCONT type 4, best-effort applications, for example, web surfing and file sharing, are a proper fit. For TCONT type 5, online gaming, which aggregates voice, video, and interactive applications, is a suitable mapping (Fig. 5). 984 series.
Media Access Control and Resource Allocation: For Next Generation Passive Optical Networks by Nirwan Ansari