Broadband powerline communications networks: network design by Halid Hrasnica, Abdelfatteh Haidine, Ralf Lehnert

By Halid Hrasnica, Abdelfatteh Haidine, Ralf Lehnert

Broadband Powerline Communications: community layout covers the purposes of broadband PLC platforms in low-voltage provide networks, a promising candidate for the belief of good value recommendations for "last mile" communications networks. there are various actions surrounding the improvement and alertness of PLC know-how within the entry region, rather due to robust curiosity of recent community services after the deregulation of telecommunications marketplace. these days, there are not any latest criteria for broadband PLC networks, which use a frequency diversity as much as 30 MHz. This e-book comprises correct and well timed information about broadband PLC platforms and particularly PLC entry networks and contributions to the layout facets of broadband PLC entry structures and their community parts.

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However, a repeater does not modify the contents of the transmitted information, which is always transparently transmitted between the network segments of an entire PLC access system (Fig. 15). 15 PLC network with repeaters f3 R PLC in the Telecommunications Access Area 25 In a first network segment, between a base station placed in the transformer unit and the first repeater, the signal is transmitted within the frequency spectrum f1 . Another frequency range (f2 ) has to be applied in the second network segment.

During the last decade, many electrical utilities realized optical communications networks along their supply lines, which can be applied for connection to the backbone as well. In this case, an access network consists of an optical and a PLC network part (Fig. 19), which leads to a hybrid solution similar to HFC networks (Hybrid Fiber Coax), in which an optical distribution network connects CATV access networks to WAN. A further solution for the realization of the backbone connection is application of PLC technology in medium-voltage supply networks (Sec.

Because of the asymmetric and changing nature of data traffic in the access area, dynamic duplex schemes are used in PLC access networks. This allows the optimal utilization of the network resources, in both downlink and uplink transmission directions according to the current load situation. However, the relatively small PLC network capacity makes it difficult for the simultaneous provision of a required QoS for a high number of subscribers. Therefore, PLC systems have to implement traffic scheduling strategies, including connection admission control (CAC), to limit the number of active subscribers ensuring a satisfactory QoS for currently admitted connections.

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