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WELCOME TO THE
RISING TECHNOLOGY

“ASYMMETRIC DIGITAL
  SUBSCRIBER LINE”




                      1
   CHAPTER 1

   INTRODUCTION

   1.1 DIFFERENT VARIANTS OF DSL
   1.2 WHAT IS ADSL
   1.3 WHAT ARE THE BENEFITS




   CHAPTER 2

   FUTURE OF ADSL                  2
3
CHAPTER          6

 ADSL EQUIPMENT




6.1 DSL EQUIPMENT DSLAM

 CHAPTER      7


 DISTANCE LIMITATIONS

                           4
CHAPTER   8

INSTALLATION   ISSUES


CHAPTER   9

APPLICATIONS




                         5
REFERENCES


             6
PASTDECADE HAS SEEN EXTENSIVE GROWTH IN THE
TELECOMMUNOCATION INDUSTRY

POPULARITY
          OF INTERNET & OTHER DATA
COMMUNICATION SERVICES HAS INCREASED

MAJORITYOF INTERNET USERS ACCESS THEIR SERVICE
VIA MODEMS CONNECTED TO P.O.T.S.

P.O.T.S.
      WAS DESIGNED FOR VOICE TRANSMISSION AT
FREQUENCIES BELOW 3 KHz
                                               7
TOINCREASE PERFORMANCE OF NEW ONLINE
SERVICES, THE BANDWIDTH HUNGRY PUBLIC MUST
CONSIDER OTHER OPTIONS

TECHNOLOGIES,SUCH AS I.S.D.N. OR CABLE
CONNECTIONS, REQUIRE SPECIAL CABLING

AP.O.T.S. CONNECTION PROVIDED AN ADEQUATE
MEDIUM FOR RELATIVELY SMALL AMOUNTS OF DATA
THAT REQUIRED TO BE TRANSMITTED

SOTHE EXISTING SYSTEM WAS THE LOGICAL CHOICE
OVER SPECIAL CABLING




                                                8
H.D.S.L.
 IT IS THE PIONEERING HIGH SPEED FORMAT,
 BUT NOT COMMERCIALLY VIABLE OPTION DUE TO ITS NEED FOR
 2 TWISTED PAIRS &
 DOESN’T HAVE SUPPORT FOR NORMAL TELE PHONE SERVICES


S.D.S.L.
 IT IS SYMMETRIC DSL
 OPERATES OVER A SINGLE TWISTED PAIR
 LIMITED TO SHORT DISTANCES
 SUFFERS N.E.X.T.


I.S.D.L.
 STANDS FOR I.S.D.N. DSL                             9
SIMILAR   TO I.S.D.N. TECHNOLOGY

LACKS   SUPPORT FOR ANALOG VOICE


V.D.S.L.
VERY   HIGH BIT RATE D.S.L.

REQUIRES
        SHORTER CONNECTIONS THAN ARE GENERALLY
PRACTICAL



A.D.S.L.
MOST   PROMISING TECHNOLOGY

SUITABLE   FOR PERSONAL BROADBAND REQUREMENTS

ALLOWS    SAME CHANNEL TO STILL ACT AS A TRADITIONAL
SERVICE                                                 10
A   MODEM TECHNOLOGY

CONVERTS EXISTING TWISTED PAIR TELEPHONE LINES
INTO ACCESS PATHS FOR MULTIMEDIA & HIGH SPEED
DATA COMMUNICATIONS

CAN    TRANSMIT UPTO 6Mbps TO SUBSCRIBER

832   Kbps IN BOTH DIRECTIONS

EXPANDS    ACCESS CAPACITY BY A FACTOR OF 50 OR
MORE

ITALLOWS MORE BANDWIDTH DOWNSTREAM THAN
FOR UPSTREAM
                                                   11
12
PROVIDESHIGH SPEED INTERNET ACCESS USING
REGULAR TELEPHONE LINES

CONNECTIVITY-ALWAYS        ON

DATA    SECURITY

EASE   OF USE

NO   DIAL-UP IS REQUIRED

SPEED
    IS UPTO 25 TIMES FASTER THAN ANALOG
MODEMS
                                            13
ADSL will play a crucial role over the next decade or more as
               telephone companies enter new
markets for delivering information in video and multimedia
            formats. New broadband cabling will
 take decades to reach all prospective subscribers. Success of
              these new services will depend on
reaching as many subscribers as possible during the first few
            years. By bringing movies, television,
 video catalogs, remote CD-ROMs, corporate LANs, and the
                Internet into homes and small
    businesses, ADSL will make these markets viable and
           profitable for telephone companies and
                  application suppliers alike.
                      ADSL Capabilities
15
oADSLMODEM CONNECTED TO EACH END OF TWISTED PAIR
TELEPHONE LINE

o3   INFORMATION CHANNELS ARE CREATED :-

o1). HIGH SPEED DOWNSTREAM CHANNEL
o2). A MEDIUM SPEED DUPLEX CHANNEL

o3). A BASIC TELEPHONE SERVICE CHANNEL



oADSL GUARANTEES UNINTERRUPTED TELEPHONE SERVICE EVEN
IF ADSL FAILS

oDOWMSTREAM       RATES DEPEND ON :-

o1).   LENGTH OF COPPER LINE                       16
A.D.S.L. presentation
POTS & A.D.S.L. DATA   18
   DEPENDS UPON ADVANCED DIGITAL SIGNAL PROCESSING
    TECHNOLOGY & ALGORITHMS

   OUTSIDE - ADSL LOOKS SIMPLE

   INSIDE- MIRACLE OF MODERN TECHNOLOGY

   IT CONSISTS OF :- TRANSMITTER & RECEIVER…..

   1).TELEPHONE EXCHANGE

   2). SPLITTER

   3). DSLAM , ISP
                                                      19
20
21
FREQUENCY RESPONSE OF ADSL

                             22
1).      CARRIERLESS AMPLITUDE / PHASE (CAP)
                 TELEPHONE   SIGNAL DIVIDED IN 3 PARTS

         i.     VOICE CONVERSATIONS- 0 TO 4 KHz (POTS CKT)

ii.      UPSTREAM CHANNEL-25 TO 160 KHz (FROM USER BACK
                         TO SERVER)

  iii.        DOWNSTREAM CHANNEL- BEGINS AT 240 KHz (FROM
                          SERVER TO USER)

                        INTERFERENCE MINIMISED
24
BLOCK     SIGNALS ABOVE CERTAIN FREQUENCY

          ALL   CONVERSATIONS- BELOW 4 KHz

 LPF’s   DESIGNED TO BLOCK SIGNALS ABOVE 4KHz

PREVENT    DATA SIGNALS FROM INTERFERING WITH
            STANDARD TELEPHONE CALLS




                                                 25
It uses two pc’s of equipments one at the customer end and one at
the internet services provider

Atthe customer location there is DSL transceiver also called as
“DSL MODEM” and ATU-R too.

DSL  service provider has a DSL access
multiplexer(DSLAM ) to receive customer connection.

The transceiver can connect to the customer equipment by using
USB or 10 base –T Ethernet connections.

The devices used by businesses may combine network routers
network switches or other networking equipments
It   really allows DSL to happen

It takes connection from many customers and
aggregates them on to a single high capacity connection
to the internet

It is flexible and able to support multiple types of DSL
in a single central office.
A.D.S.L. presentation
    IT IS A DISTANCE SENSITIVE TECHNOLOGY.

   LIMIT FOR ADSL service is 18000 feet.

    Maximum downstream speed is 8 mbps at a
    distance of about 6000 feet.


   Maximum upstream speed is 640 kbps.


   ADSL cant be received using bridge tapes , fiber
    optic cables and loading coils.                  .
DSL                           ADSL
   It do not uses the            It uses the frequency
                                   spectrum
    frequency spectrum
   Splitter or micro filter      Frequency filters are used at
    are used near                  the customers premises to
                                   avoid interference
    demarcation point             This do not require
   This requires a                technician
    technician for
    installation purposes         Less costlier than DSL
   More costlier
   DSL signal is separated       DSL signal is filtered at each
                                   phone outlet by use of LPF
    at demarcation point           for voice and HPF for data
 Maximum range for DSL without a
repeater is 5.5 km

 As distance decreases towards the telephone
company office , the data rate increases

 For larger distances , DSL service is provided
only when phone company has extended the
local loop with optical fiber cable
   The distance from local exchange

   The type and thickness of wires used

   The number and type of joins in the wire

The proximity of the wire to other wires carrying
ADSL ,ISDN and other non voice signals

   The proximity of the wires to radio transmitters
Phone     line , activation by your phone company
for it

Filter   to separate the phone signal from the internet
signal

ADSL     modem

Subscription    with an ISP supporting ADSL
 1.HIGH    SPEED INTERNET ACCESS

 2.   E-COMMERCE

 3.DISTANCE    LEARNING

 4.VIDEO   CONFERENCING

 5.ENTERTAINTMENT-ONLINE     GAMING
A.D.S.L. presentation
   IT IS ASYMMRTRIC.

   ALLOWS MORE BANDWIDTH FOR
    DOWNSTREAM THAN UPSREAM
    DATA FLOW.

   ADSL modems create multiple channels
    using FDM or echo cancellation.

   It is ideal for those who download
    much more data than they send.
A.D.S.L. presentation
A.D.S.L. presentation

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A.D.S.L. presentation

  • 1. WELCOME TO THE RISING TECHNOLOGY “ASYMMETRIC DIGITAL SUBSCRIBER LINE” 1
  • 2. CHAPTER 1  INTRODUCTION  1.1 DIFFERENT VARIANTS OF DSL  1.2 WHAT IS ADSL  1.3 WHAT ARE THE BENEFITS  CHAPTER 2  FUTURE OF ADSL 2
  • 3. 3
  • 4. CHAPTER 6 ADSL EQUIPMENT 6.1 DSL EQUIPMENT DSLAM CHAPTER 7 DISTANCE LIMITATIONS 4
  • 5. CHAPTER 8 INSTALLATION ISSUES CHAPTER 9 APPLICATIONS 5
  • 7. PASTDECADE HAS SEEN EXTENSIVE GROWTH IN THE TELECOMMUNOCATION INDUSTRY POPULARITY OF INTERNET & OTHER DATA COMMUNICATION SERVICES HAS INCREASED MAJORITYOF INTERNET USERS ACCESS THEIR SERVICE VIA MODEMS CONNECTED TO P.O.T.S. P.O.T.S. WAS DESIGNED FOR VOICE TRANSMISSION AT FREQUENCIES BELOW 3 KHz 7
  • 8. TOINCREASE PERFORMANCE OF NEW ONLINE SERVICES, THE BANDWIDTH HUNGRY PUBLIC MUST CONSIDER OTHER OPTIONS TECHNOLOGIES,SUCH AS I.S.D.N. OR CABLE CONNECTIONS, REQUIRE SPECIAL CABLING AP.O.T.S. CONNECTION PROVIDED AN ADEQUATE MEDIUM FOR RELATIVELY SMALL AMOUNTS OF DATA THAT REQUIRED TO BE TRANSMITTED SOTHE EXISTING SYSTEM WAS THE LOGICAL CHOICE OVER SPECIAL CABLING 8
  • 9. H.D.S.L. IT IS THE PIONEERING HIGH SPEED FORMAT, BUT NOT COMMERCIALLY VIABLE OPTION DUE TO ITS NEED FOR 2 TWISTED PAIRS & DOESN’T HAVE SUPPORT FOR NORMAL TELE PHONE SERVICES S.D.S.L. IT IS SYMMETRIC DSL OPERATES OVER A SINGLE TWISTED PAIR LIMITED TO SHORT DISTANCES SUFFERS N.E.X.T. I.S.D.L. STANDS FOR I.S.D.N. DSL 9
  • 10. SIMILAR TO I.S.D.N. TECHNOLOGY LACKS SUPPORT FOR ANALOG VOICE V.D.S.L. VERY HIGH BIT RATE D.S.L. REQUIRES SHORTER CONNECTIONS THAN ARE GENERALLY PRACTICAL A.D.S.L. MOST PROMISING TECHNOLOGY SUITABLE FOR PERSONAL BROADBAND REQUREMENTS ALLOWS SAME CHANNEL TO STILL ACT AS A TRADITIONAL SERVICE 10
  • 11. A MODEM TECHNOLOGY CONVERTS EXISTING TWISTED PAIR TELEPHONE LINES INTO ACCESS PATHS FOR MULTIMEDIA & HIGH SPEED DATA COMMUNICATIONS CAN TRANSMIT UPTO 6Mbps TO SUBSCRIBER 832 Kbps IN BOTH DIRECTIONS EXPANDS ACCESS CAPACITY BY A FACTOR OF 50 OR MORE ITALLOWS MORE BANDWIDTH DOWNSTREAM THAN FOR UPSTREAM 11
  • 12. 12
  • 13. PROVIDESHIGH SPEED INTERNET ACCESS USING REGULAR TELEPHONE LINES CONNECTIVITY-ALWAYS ON DATA SECURITY EASE OF USE NO DIAL-UP IS REQUIRED SPEED IS UPTO 25 TIMES FASTER THAN ANALOG MODEMS 13
  • 14. ADSL will play a crucial role over the next decade or more as telephone companies enter new markets for delivering information in video and multimedia formats. New broadband cabling will take decades to reach all prospective subscribers. Success of these new services will depend on reaching as many subscribers as possible during the first few years. By bringing movies, television, video catalogs, remote CD-ROMs, corporate LANs, and the Internet into homes and small businesses, ADSL will make these markets viable and profitable for telephone companies and application suppliers alike. ADSL Capabilities
  • 15. 15
  • 16. oADSLMODEM CONNECTED TO EACH END OF TWISTED PAIR TELEPHONE LINE o3 INFORMATION CHANNELS ARE CREATED :- o1). HIGH SPEED DOWNSTREAM CHANNEL o2). A MEDIUM SPEED DUPLEX CHANNEL o3). A BASIC TELEPHONE SERVICE CHANNEL oADSL GUARANTEES UNINTERRUPTED TELEPHONE SERVICE EVEN IF ADSL FAILS oDOWMSTREAM RATES DEPEND ON :- o1). LENGTH OF COPPER LINE 16
  • 18. POTS & A.D.S.L. DATA 18
  • 19. DEPENDS UPON ADVANCED DIGITAL SIGNAL PROCESSING TECHNOLOGY & ALGORITHMS  OUTSIDE - ADSL LOOKS SIMPLE  INSIDE- MIRACLE OF MODERN TECHNOLOGY  IT CONSISTS OF :- TRANSMITTER & RECEIVER…..  1).TELEPHONE EXCHANGE  2). SPLITTER  3). DSLAM , ISP 19
  • 20. 20
  • 21. 21
  • 23. 1). CARRIERLESS AMPLITUDE / PHASE (CAP) TELEPHONE SIGNAL DIVIDED IN 3 PARTS i. VOICE CONVERSATIONS- 0 TO 4 KHz (POTS CKT) ii. UPSTREAM CHANNEL-25 TO 160 KHz (FROM USER BACK TO SERVER) iii. DOWNSTREAM CHANNEL- BEGINS AT 240 KHz (FROM SERVER TO USER)  INTERFERENCE MINIMISED
  • 24. 24
  • 25. BLOCK SIGNALS ABOVE CERTAIN FREQUENCY ALL CONVERSATIONS- BELOW 4 KHz LPF’s DESIGNED TO BLOCK SIGNALS ABOVE 4KHz PREVENT DATA SIGNALS FROM INTERFERING WITH STANDARD TELEPHONE CALLS 25
  • 26. It uses two pc’s of equipments one at the customer end and one at the internet services provider Atthe customer location there is DSL transceiver also called as “DSL MODEM” and ATU-R too. DSL service provider has a DSL access multiplexer(DSLAM ) to receive customer connection. The transceiver can connect to the customer equipment by using USB or 10 base –T Ethernet connections. The devices used by businesses may combine network routers network switches or other networking equipments
  • 27. It really allows DSL to happen It takes connection from many customers and aggregates them on to a single high capacity connection to the internet It is flexible and able to support multiple types of DSL in a single central office.
  • 29. IT IS A DISTANCE SENSITIVE TECHNOLOGY.  LIMIT FOR ADSL service is 18000 feet.  Maximum downstream speed is 8 mbps at a distance of about 6000 feet.  Maximum upstream speed is 640 kbps.  ADSL cant be received using bridge tapes , fiber optic cables and loading coils. .
  • 30. DSL ADSL  It do not uses the  It uses the frequency spectrum frequency spectrum  Splitter or micro filter  Frequency filters are used at are used near the customers premises to avoid interference demarcation point  This do not require  This requires a technician technician for installation purposes  Less costlier than DSL  More costlier  DSL signal is separated  DSL signal is filtered at each phone outlet by use of LPF at demarcation point for voice and HPF for data
  • 31.  Maximum range for DSL without a repeater is 5.5 km  As distance decreases towards the telephone company office , the data rate increases  For larger distances , DSL service is provided only when phone company has extended the local loop with optical fiber cable
  • 32. The distance from local exchange  The type and thickness of wires used  The number and type of joins in the wire The proximity of the wire to other wires carrying ADSL ,ISDN and other non voice signals  The proximity of the wires to radio transmitters
  • 33. Phone line , activation by your phone company for it Filter to separate the phone signal from the internet signal ADSL modem Subscription with an ISP supporting ADSL
  • 34.  1.HIGH SPEED INTERNET ACCESS  2. E-COMMERCE  3.DISTANCE LEARNING  4.VIDEO CONFERENCING  5.ENTERTAINTMENT-ONLINE GAMING
  • 36. IT IS ASYMMRTRIC.  ALLOWS MORE BANDWIDTH FOR DOWNSTREAM THAN UPSREAM DATA FLOW.  ADSL modems create multiple channels using FDM or echo cancellation.  It is ideal for those who download much more data than they send.