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DSL

1. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 1
Seminar Presentation
on
“DSL TECHNOLOGY”
Under the Guidance of
PROF. B. R. MANDRE
Submitted By
MARATHE TUSHAR PANDURANG
DEPARTMENT OF COMPUTER ENGINEERING
S.S.V.P.S.’s B.S. DEORE COLLEGE OF ENGINEERING, DHULE.
2003 -2004

2. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 2
INTRODUCTION
•Internet
+EveryonehavingaPC,Interact
withtheworld–calledInternet
+Miracle!!
+Usestelephonelineslaiddown
betweenatelephonesetanda
telephoneoffice
+Disadvantages
-phonebusy
-hugedownloadingtime
•DSL Technology is solution

3. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 3
Digital Subscriber Line
•Enablestousetheunusedbandwidthinaregular
phoneline
•Usestodeliverahighspeed,downstreamandlow
speed,upstream
•Increasetheinformation-carryingabilityofcopper
wires
•Enableshighspeedmultimediaservices
•Candownloaddataupto1.5Mbpsand512Kbps
upstream

4. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 4
How Does DSL Works ?
•Allows greater bandwidth
•DSL modems provide
-downlink speed > 6 mbps
-uplink speed of 640 kbps
-faster than ISDN
•Geographic requirements
-end user within 18,000ft of central office

5. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 5
DSL Equipment
•DSLTransceiver
-“DSLmodem”orATU-R
-mostresidentialinstallationuses
USBor10base-T
-devicesusedbybusinessmay
combinen/wrouters,n/wswitches
•DSLAM
-takesconnectionfrommany
customersandaggregatesthem
ontoasingle,highcapacity
connectiontotheinternet
-Supportmultipletypesof
DSLinasinglecentraloffice

6. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 6
xDSL TECHNOLOGY
•Introduction To xDSL Technology
-generic abbreviation for many flavors of DSL
-speed depends on
* equipment used,
* distances involved,
* cabling quality,
* encoding techniques,
* frequency spectrum available
•Various Types Of xDSL

7. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 7
xDSL TECHNOLOGY
•Various Types Of xDSL
-ADSL : * Popular , asymmetric B.W.
* Downstream speed 768kbps to 9Mbps
* Upstream speed 64kbps to 1.5Mbps
-CDSL:* Proprietary technology
* Trademark by Rockwell International
-HDSL:* Provide Full-duplex symmetric D.C.
* Uses PAM on a 4-wire loop.

8. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 8
xDSL TECHNOLOGY
•Various Types of xDSL
-HDSL2:*UsesOPTIS(Overlapped
phaseTrellis-code
InterlockedSpectrum)
-IDSL : * ISDN based DSL
* uses 2B1Q line coding
* supports data transfer rate of
128 kbps

9. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 9
xDSL TECHNOLOGY
•Various Types of xDSL
-RADSL : * uses CAP and PM
* uplink rate depends on the
downlink rate
-SDSL : * 2-wire implementation of
HDSL
* supports T1/E1 on a single pair
to a distance of 11,000 ft.

10. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 10
ASYMMETRIC DIGITAL
SUBSCRIBER LINE
•Physicallayertransmissionprotocol(newmodem
technology)
•Convertsexistingtwisted-pairtelephonelinesinto
accesspathsformultimediaandhighspeeddata
communications

11. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 11
ADSL Capabilities
•Creates 3 information channels
+ a high speed downstream channel
-ranges from 1.5 to 6.1
Mbps
+ a medium speed duplex channel
-ranges from 16 to 640
Kbps
+ basic telephone service channel
-split off from digital
modem by filters

12. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 12
ADSL Technology
•4KHzregionattheDCendof
thebandissplitoffforPOTS
•FDMassignsseparatebandsfor
upstreamanddownstreamdata;
downstreampathisdividedby
TDMintoseveralchannels
•Inechocancellation,upstream
anddownstreambandsoverlap
(sametechniqueasV.34
modems)

13. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 13
ADSL Advantages
•Advantages
-Less costly than fiber alternatives
-“Alwayson”connectivitymoreconvenient,
enablesremoteoffice
-Qualityofconnectivityisincreased,enables
newapplicationssuchasvideoconferencing

14. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 14
Very-High-Data-Rate DSL
•Transmitshigh-speeddataovershortreachesoftwistedpair
coppertelephonelines
•Provides
-downstreamspeed51to55Mbpsoverlinesupto1000ft
-downstreamspeed<13Mbpsoverlengthsbeyond4000ft
-upstreamspeedfrom1.6to2.3Mbps

15. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 15
VDSL Technology
•Line Code Candidates –4 line codes
+ CAP , DMT, DWMT, SLC
•Channel Separation
-normally downstream channel locate above upstream channel
-use FDM to separate

16. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 16
VDSL’s Relationship with ADSL
•Datarates=>VDSL>10*(ADSL)
•ADSLmustcontendwithmuchlarger
dynamicrangesthanVDSL
•ADSLemploysdataratesfrom1.5to
9MbpswhileVDSL–13to55Mbps
•ADSLemploysrangingto18,000ft
whileVDSL–4,500ft
•VDSLsuitableforafull-servicen/w
butADSLmaynotbeafull-service
technology

17. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 17
Applications of DSL Technology
•High Speed Internet Access
-Get instant Internet
-Move files fast
-Telecommute in the fast lane
-Get software
-Add voice and video to your Internet communications
•Sharing the DSL Internet Experience

18. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 18
CONCLUSION
•Advantages
-provide wide range frequency band
-speed achieved is very high
-does not require new wiring
•Disadvantages
-closer to the provider’s central office
-faster for receiving but slower in sending
-service not available elsewhere

19. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 19
BIBLIOGRAPHY
1.Vladimir Krsti, Mirjana Stojanovi, “DIGITAL
SUBSCRIBER LINE TECHNOLOGY: NETWORK
ARCHITECTURE, DEPLOYMENT PROBLEMS AND
TECHNICAL SOLUTIONS”, June 2000
2. “ADSL”, http://www.adsl.com/dsl_forum.html
3. “Digital Subscriber Line”,
http://computer.howstuffworks.com/dsl.htm
4. “Very-high-data-rate DSL”,
http://computer.howstuffworks.com/vdsl.htm
5.“Data comm. / xdsl-faq”,
http://conder.depaul.edu/~jkristof/xdsl-faq.txt

20. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 20
Any Questions … ?

21. B.E. Computer Seminar
/ 21September 8th, 2003 Marathe Tushar P. 21
Thank You