ADSL Broadband how it works the local network the bigger picture the local picture Julian Pratt Openreach.

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Presentation transcript:

ADSL Broadband how it works the local network the bigger picture the local picture Julian Pratt Openreach

© British Telecommunications plc How does it work? ADSL Broadband is delivered over a standard BT telephone line Digital Subscriber Line (DSL) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary telephone lines

© British Telecommunications plc Local Loop End-User Local Exchange PSTN DATA Network Voice & Data Web access & talk on the same line at the same time Two services over the same copper pair Two bills Two types of fault process Upstream (up to 256kbits/s) Downstream (up to 8mbits/s+)

© British Telecommunications plc ADSL exchange connection Internet Link (Data) ADSL Mux ADSL & voice In/Out voice In/Out Exch Side Line Side Exchange (Dial Tone) Copper Access Network Remove Main Distribution Frame

© British Telecommunications plc End-user splitters (filters) Two main types NTE2000 Service Specific Front Plate Micro Filter Micro filters typically supplied by ISP

© British Telecommunications plc UK market structure BT is both a wholesaler and a retailer Infrastructure Providers BT Wholesale Homes Businesses End Users Internet Service Providers BT Retail Virgin Media CPW O2 Tiscali Entanet etc Service Providers Cable LLU & OLOs openreach

© British Telecommunications plc DSL performance The performance of DSL on any given line in the access network is a function of the signal to noise ratio at the end of that line: –Signal is affected by the length, quality and dimensions of the copper (and sometime aluminium) cable, –Noise can come from network crosstalk (directly related to the “fill” level of the cables in use,) sources in the home or premises (including home wiring) sources in the environment e.g. RFI from other electrical equipment Geographic coverage achieved at any given speed also depends on –the topology of the access network –the statistical distribution of line lengths These factors are identical for anyone operating DSL on BT’s access network

© British Telecommunications plc Points of Help Distance, an attempt will be made to provide service on every line unless a previous attempt failed, check on Customer wiring quality – Very useful site, lots of infohttp:// – Good set of FAQshttp:// – free.html?searchString=double+your+speed Specifically addresses speed issueshttp:// free.html?searchString=double+your+speed – legends.pdf this has a particularly useful section on how to repair home wiringhttp:// legends.pdf – how-to-improve-your-broadband-speeds.html

© British Telecommunications plc iPlate ( )

© British Telecommunications plc Thank you