Hello, everyone!
Today, I would like to continue and share with you about the techno-economic model - access network architecture.
In this model, we study the access part of the network, starting at the central office and ending at the subscriber’s CPE (see below Fig. 1). The cost model is based on a single central office, connecting the subscribers through several aggregation nodes.
Fig. 1. Network architecture
The goal is to optimise the network in order to minimise the cost for a given performance criterion. The network is sised for the total number of Homes Passed. Consequently, all infrastructure costs (trenches, housing, electronics and fiber deployment) are incurred for all Homes Passed. Despite he costs of the CPE’s, ports in the fiber node are only incurred when a home subscribes.
The access network architecture used in this model is divided into three main segments (see below Fig. 2): Inside, Outside, and End User. In the CO the different traffic flows are multiplexed/demultiplexed for further uplink connection to metropolitan and transport networks or, when it concerns local traffic, switched or routed back to the access network. For the CO we consider the following components: OLT ports, OLT chassis and passive splitters.
Fig. 2. Block diagram for Access Technologies
The outside segment is divided into three main parts: the feeder, aggregation Nodes and distribution (for HFC technology the distribution segment is divided into distribution and drop). Feeder segment comprise the network between the CO and the aggregation nodes.
The model includes not only the cost of equipment (Fiber repeaters), but also the optical fiber cables, installation, trenches, and housing (street cabinets) costs. The ducts can be shared by several optical fiber cables. The aggregation nodes are located in access areas street cabinets. The components of these nodes depend on the technology.
The distribution network links the aggregation nodes with CPE. Like feeder networks, in distribution, the model includes not only the cost of equipment (copper, coax, and LV grid repeaters), but also the cables, installation, and trenches costs.
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