Performance Analysis of Upstream Traffic Using TDM Based Ethernet Passive Optical Network
Faruq, Md. Akhtar Omar
Rahman, Md. Masiur
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As Ethernet PON (EPON) systems move into mass deployment, Service Providers have begun in earnest to explore the utility of this technology for delivering services other than besteffort Ethernet transport PON may be deployed as a bus, ring, or tree topology. While it is a very cost-effective solution, it has some unique problems, not found in backbone or metropolitan networks. One of such problems is upstream traffic synchronization. In the upstream direction PON is a multipoint-to-point (MPtP) network. Because distance from central office (CO) to every optical network unit (ONU) is different, if every unit will transmit in its own time slot, due to differences in propagation delays, data will collide in the point where fibers from different network units join together. In this paper we present an operation called ranging – a process of determining a specific delay for every optical network unit, such that all upstream transmissions will arrive to the central office without collisions. There are several ways to perform ranging. The presented solution is very cost-effective, as it doesn’t require additional optical transmitters and receivers to be installed in the network.
- November 2007