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Broadband Overpower Line

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  www.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/ Broadband Over Power Line 2010 Chapter 1 INTRODUCTION fter years of development! technolo y to deliver hi h-speed data over thee#istin electric power delivery networ$ has emer ed in the mar$etplace. %alled broadband over power line &BPL'! this technolo y offers an alternative means of  providin hi h-speed internet access! (oice over )nternet Protocol &(o)P'! and other  broadband services! usin medium- and low- volta e lines to reach customers* homesand businesses.Broadband over Power Line &BPL'! also $nown as Power Line%ommunications &PL%' is a disruptive communications technolo y that enables    power line infrastructure landlords &electric utilities + property owners' and their system operator partners to deliver a suite of )nternet Protocol &)P' based servicesusin their e#istin power distribution infrastructure.BPL transmits hi h fre,uency data si nals throu h the same power cablenetwor$ used in carryin electrical power to household/or business subscribers. )norder to ma$e use of BPL! subscribers install a modem that plu s into an ordinaryelectrical wall outlet and pay a subscription fee similar to those paid for other types of )nternet service. 1.1 Evolution of BPL BPL is based on PL% technolo y developed in 0 by 1+1 Bell 1elephoneLaboratories! and which has been used for internal and low-speed datacommunication applications since that time by the electric power utilities. Based onPL% technolo y! some customer premises e,uipment &%P2' such as intercomsystems! have used the embedded electrical wire to avoid the cost of special wirin .)n 2urope and most of the rest of the world! PL% standards allow for communicationsover the 3-43 volt power rid at fre,uencies of 3 567 to 83 567. )n the 9nited:tates! the standards for the 3 volt power rid allow the use of fre,uencies above83 567 as well. Power utilities use the fre,uencies below 43 567 for internalapplications such as telemetry and monitorin and control of e,uipment at remotewww.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/  ;inal <ear Project=s is One place for all 2n ineerin Projects! Presentation! seminar! summer trainin report and lot more. >O12?-1his wor$ is copyri ht to its uthors. 1his is only for 2ducational Purpose.  www.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/ Broadband Over Power Line 2010 sub-stations. )n the 3s! development be an on broadband over power line &BPL'!which has since then been re ionally standardi7ed.@espite the spread of broadband technolo y in the last few years! there aresi nificant areas of the world that don=t have access to hi h-speed )nternet. Ahenwei hed a ainst the relatively small number of customers )nternet providers would ain! the incremental e#penditures of layin cable and buildin the necessaryinfrastructure to provide @:L or cable in many areas! especially rural! is too reat.But if broadband could be served throu h power lines! there would be no need to build a new infrastructure. nywhere there is electricity there could be broadband.1echnolo y to deliver hi h-speed data over the e#istin electric power deliverynetwor$ is closer to reality in the mar$etplace. By combinin the technolo ical    principles of radio! wireless networ$in ! and modems! developers have created a wayto send data over power lines and into homes at speeds between 833 $ilobits and me abits per second &e,uivalent to @:L and cable'. 1he technolo y evolution in thene#t few years is important from a perspective of future competitive position of BPLas new networ$s are built and alternative technolo ies emer e.Broadband access and services are delivered usin a variety of technolo ies!networ$ architectures and transmission methods. 1he most si nificant broadbandtechnolo ies include?  @i ital :ubscriber Line &@:L'  %oa#ial %able   :atellite@:L is a very hi h-speed connection to )nternet that uses the same wires as are ular telephone line.  standard telephone installation in the 9nited :tates consistsof a pair of copper wires. 1his pair of copper wires has sufficient bandwidth for carryin both data and voice. (oice si nals use only a fraction of the availablecapacity on the wires. @:L e#ploits this remainin capacity to carry information onthe wire without affectin the line*s ability to carry voice conversations. But there are several limitations of @:L describe below ?  1he ,uality of connection depends upon the pro#imity to the provider*s centralwww.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/  ;inal <ear Project=s is One place for all 2n ineerin Projects! Presentation! seminar! summer trainin report and lot more. >O12?-1his wor$ is copyri ht to its uthors. 1his is only for 2ducational Purpose.  www.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/ Broadband Over Power Line 2010 office! closer the better   eceivin data is faster than sendin data over the internet  @:L is not available everywhere;or millions of people! television brin s news! entertainment and educational pro rams into their homes. Cany people et their 1( si nal from cable television&%1(' because cable 1( provides better reception and more channels. Cany people who have cable 1( can now et a hi h-speed connection to the)nternet from their cable provider. %able modems allow subscribers to access hi h-speed data services over cable systems that are enerally desi ned with hybrid fiber-coa#ial   &6;%' architecture. %able modem service is primarily residential! but mayalso include some small business service.1he disadvanta e of coa#ial cable is that when there are heavy-access users! areconnected to the channel! you will have to share the entire bandwidth! and may seeyour performance de rade as a result. )t is possible that! in times of heavy usa e withmany connected users! performance will be far below the theoretical ma#imums.   :atellite )nternet access is ideal for rural )nternet users who want broadbandaccess. :atellite )nternet does not use telephone lines or cable systems! but insteaduses a satellite dish for two-way &upload and download' data communications.9pload speed is about one-tenth of the 833 $bps download speed. %able and @:Lhave hi her download speeds! but satellite systems are about 3 times faster than anormal modem. 1wo-way satellite )nternet consists of appro#imately a two-foot bythree-foot dish! two modems &uplin$ and downlin$'! and coa#ial cables between dishand modem. 1he $ey installation plannin re,uirement is a clear view to the south!since the orbitin satellites are over the e,uator area. nd! li$e satellite 1(! trees andheavy rains can affect reception of the )nternet si nals. . %omparison of ccess 1echnolo ies 1.2 Arhiteture of BPL Broadband over Power Lines networ$ is overlaid on the medium-volta e andlow-volta e se ments of the power distribution system. 6i h-speed bac$haulwww.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/  ;inal <ear Project=s is One place for all 2n ineerin Projects! Presentation! seminar! summer trainin report and lot more. >O12?-1his wor$ is copyri ht to its uthors. 1his is only for 2ducational Purpose.  www.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/ Broadband Over Power Line 2010 connections can be brou ht to the BPL networ$ at substations or elsewhere alon themedium volta e circuit. n mbient node provides connectivity between the bac$haul connection and the medium volta e se ment of the BPL networ$. 6i hspeed data travels over this medium-volta e se ment to remote locations where is ittransferred to the low-volta e se ment or to a wireless interface for the final le tothe end user or networ$ element bein mana ed.  simplified view is shown is ;i ure.. ;i ure . BPL >etwor$ rchitecture 1he dia ram below &)nductive %ouplin )njection 1echni,ue' shows how theBPL injector converts the )P data traffic into an ; si nal in a si nal cable.   1he si nalis then injected into the C( or L( cable by induction usin ferrite cores. 1his iswww.final-yearprojects.co.cc | www.troubleshoot4free.com/fyp/  ;inal <ear Project=s is One place for all 2n ineerin Projects! Presentation! seminar! summer trainin report and lot more. >O12?-1his wor$ is copyri ht to its uthors. 1his is only for 2ducational Purpose.
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