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DSL

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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DSL

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  1. DSL • IS8040 • Data Communication Theory and Practice • William McCartney

  2. Where is DSL • began in 1998 • every major telephone company in • Europe • U.S.A. • Canada • Asia Pacific areas

  3. What is DSL • DSL - digital subscriber line • continuous connection • dedicated bandwidth • digital therefore no audio to digital conversion causing a loss of bandwidth

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. HDSL • Direct replacement for traditional T1 lines • 1.54Mbps up to 12,000 ft • Most mature of all DSL technologies • Uses 2 copper pairs

  11. 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)

  12. HDSL-2 • Supports • voice • data • video • using • ATM • frame - relay • private line T1 service

  13. 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

  14. VDSL • Anticipated new services • interactive TV • video on demand • HDTV (high definition TV)

  15. 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

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