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DSL - PowerPoint PPT Presentation


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DSL. IS8040 Data Communication Theory and Practice William McCartney. Where is DSL. began in 1998 every major telephone company in Europe U.S.A. Canada Asia Pacific areas. What is DSL. DSL - digital subscriber line continuous connection dedicated bandwidth

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slide1
DSL
  • IS8040
  • Data Communication Theory and Practice
  • William McCartney
where is dsl
Where is DSL
  • began in 1998
  • every major telephone company in
    • Europe
    • U.S.A.
    • Canada
    • Asia Pacific areas
what is dsl
What is DSL
  • DSL - digital subscriber line
  • continuous connection
  • dedicated bandwidth
  • digital therefore no audio to digital conversion causing a loss of bandwidth
what is dsl1
What is DSL
  • achieves broadband speeds over ordinary phone lines (T1 requires special line installation)
  • carries voice and data
  • downstream connections vary from 512 kbits/sec to 1.544 mbits/sec
  • upstream connections typically at 128 kb/sec
types of dsl
Types of DSL
  • ADSL - asymmetric DSL
  • SDSL - symmetric DSL
  • IDSL - ISDN (integrated services digital network) DSL
  • HDSL - high bit rate DSL
  • HDSL2 - high bit rate DSL 2
  • VDSL - very high speed DSL
  • G.Lite - DSL Lite - splitterless DSL or universal DSL
  • MDSL - multi-rate DSL
  • RADSL - rate adaptive DSL
slide6
ADSL
  • asymmetric DSL
  • Typically 8 Mb/s downstream
    • (125 times faster than 56K modem)
  • Typically 640 kb/s upstream
  • 6Mbps 12,000 ft 24awg
  • 6Mbps 9,000 ft 26awg
  • 1.5Mbps 18,000 ft 24awg
  • 1.5Mbps 15,000 ft 26awg
sdsl symmetric dsl
SDSL - symmetric DSL
  • Also known as single line DSL
  • Same rate upstream and downstream - typically 2.3mb/sec
  • More suitable for push/pull communications
  • Good up to 10,000 ft
slide8
IDSL
  • Integrated services digital network digital subscriber line (ISDN)
  • Uses 2 x 64K channels and 1 x 16K channel
    • 144kb/sec on existing phone lines
  • specifically designed for homes and offices too far from phone company’s central office (CO) to subscribe to ADSL
slide9
IDSL
  • Good up to 18,000 ft without repeaters
  • ISDN passes through the CO’s voice network
  • IDSL bypasses the voice network (uses a special router at phone company)
  • dedicated services billed at a flat rate as opposed to ISDN which requires call setup and may have per-call fees
slide10
HDSL
  • Direct replacement for traditional T1 lines
  • 1.54Mbps up to 12,000 ft
  • Most mature of all DSL technologies
  • Uses 2 copper pairs
hdsl 2
HDSL-2
  • Newer version of DSL technology also known as high-speed DSL
  • symmetric technology intended to replace T1/E1 lines & older generation HDSL technology
  • uses single pair of copper wires
  • 1.5mb/sec up to 12,000 feet (3,650 meters)
hdsl 21
HDSL-2
  • Supports
    • voice
    • data
    • video
  • using
    • ATM
    • frame - relay
    • private line T1 service
slide13
VDSL
  • Very high speed DSL
  • transmits high speed data over existing phone lines
  • fast rates over relatively short distances
    • 51Mbps to 55Mbps up to 1,000 feet (300m)
    • 10Mbps up to 3,000 ft (900m)
  • connects to neighborhood optical network units (ONUs) which connect to the CO main fiber network backbone
slide14
VDSL
  • Anticipated new services
    • interactive TV
    • video on demand
    • HDTV (high definition TV)
references
References
  • http://www.cid.alcatel.com/frames/builder.jhtml?content=/doctypes/techprimer/keywords/dsl.jhtml
  • http://www.oco.net/access/access_solutions.htm
  • http://gometanet.com/connect/dslprice.htm
  • http://www.iec.org/tutorials/adsl/
  • http://homepage.interaccess.com/~jkristof/xdsl-faq.txt
  • http://internet.weather.net/idslfaq.html
  • http://www.orckit.com/fr_newsa.html?/hdsl2.html