datacom ii remote access 1 remote access lecture ii
TRANSCRIPT
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 11
REMOTE ACCESSLecture II
REMOTE ACCESSLecture II
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 22
REMOTE ACCESSREMOTE ACCESS
What Is It ?What Is It ?
Accessing a network from a remote locationAccessing a network from a remote location
Accessing the LAN from a remote locationAccessing the LAN from a remote location Accessing the Internet Accessing the Internet
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 33
REMOTE ACCESSREMOTE ACCESS
WHY REMOTE ACCESS ?WHY REMOTE ACCESS ? E-Mail and File TransfersE-Mail and File Transfers Online transaction processing Online transaction processing Emphasis on telecommutingEmphasis on telecommuting Price reductions in portable systemsPrice reductions in portable systems Competitive PressuresCompetitive Pressures
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 44
REMOTE ACCESSREMOTE ACCESS
TYPES OF REMOTE ACCESSTYPES OF REMOTE ACCESS
O N L IN E D E F E R R E D IN B O U N D O U T B O U N D
R E M O T E A C C E S S
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 55
REMOTE ACCESSREMOTE ACCESSREMOTE ACCESSREMOTE ACCESS
REMOTE ACCESSREMOTE ACCESS
REMOTE ACCESS USERSREMOTE ACCESS USERS
HOME OFFICEHOME OFFICEHOME OFFICEHOME OFFICE
OUTBOUNDOUTBOUNDOUTBOUNDOUTBOUND
SOHOSOHOSOHOSOHO TRAVELLINGTRAVELLING EMPLOYEEEMPLOYEE
TRAVELLINGTRAVELLING EMPLOYEEEMPLOYEE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 66
REMOTE ACCESSREMOTE ACCESS
FUTURE ARCHITECTUREFUTURE ARCHITECTURE
Application LogicApplication LogicApplication LogicApplication Logic
Remote MiddlewareRemote MiddlewareRemote MiddlewareRemote Middleware
ISDN ADSL MODEM CABLE MODEMISDN ADSL MODEM CABLE MODEMSATELLITE WIRELESSSATELLITE WIRELESS
Remote MiddlewareRemote MiddlewareRemote MiddlewareRemote Middleware
Data ManagementData ManagementData ManagementData Management
Application LogicApplication LogicApplication LogicApplication Logic
PresentationPresentationPresentationPresentation
Data ManagementData ManagementData ManagementData Management
SERVERSERVER
WANWAN
MOBILE/MOBILE/ REMOTE REMOTE CLIENTCLIENT
Source:-Gartner GroupSource:-Gartner Group
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 77
REMOTE ACCESSREMOTE ACCESS
FEATURES OF THE ARCHITECTUREFEATURES OF THE ARCHITECTURE
STORE AND FORWARDSTORE AND FORWARD SINGLE SESSION COMMUNICATIONSSINGLE SESSION COMMUNICATIONS NETWORK INDEPENDENCENETWORK INDEPENDENCE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 88
REMOTE ACCESSREMOTE ACCESS
BANDWIDTH DEMAND FORECASTBANDWIDTH DEMAND FORECASTFEATURE BANDWIDTH(Kbps)
Live Desktop Videoconferencing 64
Replicated Data Services 128
Dedicated Voice Channel 16
Dedicated Internet 64
Client/Server Applications 256
TOTAL DESIRED BANDWIDTH :-TOTAL DESIRED BANDWIDTH :- 528 Kbps528 Kbps
Source:-Gartner GroupSource:-Gartner Group
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 99
REMOTE ACCESSREMOTE ACCESS
OPTIMIZATION TECHNIQUESOPTIMIZATION TECHNIQUES
GENERIC TECHNIQUESGENERIC TECHNIQUES LAN BASED TRAFFIC OPTIMIZATIONLAN BASED TRAFFIC OPTIMIZATION APPLICATION DRIVEN TECHNIQUESAPPLICATION DRIVEN TECHNIQUES
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1010
REMOTE ACCESSREMOTE ACCESS
GROWTH IN NUMBER OF REMOTE ACCESS USERSGROWTH IN NUMBER OF REMOTE ACCESS USERS
0
5
10
15
20
25
30
3519
91
1992
1993
1994
1995
1996
1997
1998
1999
2000
United StatesEuropeRest of World
No.of UsersNo.of Users(in Millions)(in Millions)
Source:Gartner GroupSource:Gartner Group
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1111
REMOTE ACCESSREMOTE ACCESS
SUMMARY TILL NOW…SUMMARY TILL NOW… More than 32m remote users by 2000.More than 32m remote users by 2000. By 2001,Remote Access will be a necessity not a luxury.By 2001,Remote Access will be a necessity not a luxury. Bandwidth requirement will shoot up.Bandwidth requirement will shoot up. By, 2001 new applications for Deferred Remote Access By, 2001 new applications for Deferred Remote Access
will be written.will be written. By 2001, Remote Performance Optimization standards By 2001, Remote Performance Optimization standards
will come in place.will come in place.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1212
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1313
REMOTE ACCESSREMOTE ACCESS
TILL NOW….TILL NOW….
Older StandardsOlder Standards
V.32 V.32
V.32 bisV.32 bis
V.34V.34
V.34+V.34+
DIAL UP MODEMSDIAL UP MODEMS
V.32V.32
V.32bisV.32bis
V.34V.34
V.34+V.34+
33.6Kbps33.6Kbps
28.8Kbps28.8Kbps
14.4Kbps14.4Kbps
9600bps9600bps
300bps300bps
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1414
REMOTE ACCESSREMOTE ACCESS
WHAT NOW….WHAT NOW….
Kflex 56.(Motorola)Kflex 56.(Motorola) X 2(3Com)X 2(3Com)
DIAL UP MODEMSDIAL UP MODEMS
Kflex 56Kflex 56X2X2
V.34V.34
56 Kbps56 Kbps
33.4 Kbps33.4 Kbps
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1515
REMOTE ACCESSREMOTE ACCESS
THE 56K TECHNOLOGYTHE 56K TECHNOLOGY
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1616
REMOTE ACCESSREMOTE ACCESS
FEATURES OF THE 56K TECHNOLOGYFEATURES OF THE 56K TECHNOLOGY SERVICES OVER REGULAR PHONE LINES.SERVICES OVER REGULAR PHONE LINES.
100% DIGITAL NETWORK EXCEPT THE LOCAL 100% DIGITAL NETWORK EXCEPT THE LOCAL LOOP.LOOP.
DOWNLOADS FROM INTERNET,CORPORATE DOWNLOADS FROM INTERNET,CORPORATE NETWORKS AT 56Kbps.NETWORKS AT 56Kbps.
BACKWARD COMPATIBLE.BACKWARD COMPATIBLE.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1717
REMOTE ACCESSREMOTE ACCESS
100% DIGITAL CONNECTION 100% DIGITAL CONNECTION EXCEPT THE LOCAL LOOP.EXCEPT THE LOCAL LOOP.
ASYMMETRICAL CONNECTION.ASYMMETRICAL CONNECTION. UPSTREAM SPEED LIMITED DUE UPSTREAM SPEED LIMITED DUE
TO A/D CONVERSION.TO A/D CONVERSION.
USE “PAM” IN DOWNSTREAM USE “PAM” IN DOWNSTREAM AND “QAM” IN UPSTREAM.AND “QAM” IN UPSTREAM.
OPTIMIZED FOR END TO END OPTIMIZED FOR END TO END ANALOG CONNECTIONS.ANALOG CONNECTIONS.
SYMMETRICAL CONNECTION.SYMMETRICAL CONNECTION. A/D CONVERSION TAKING A/D CONVERSION TAKING
PLACE AT BOTH ENDS HENCE PLACE AT BOTH ENDS HENCE LIMITING SPEED.LIMITING SPEED.
USES “QAM” IN BOTH USES “QAM” IN BOTH DIRECTIONS.DIRECTIONS.
DIFFERENCE BETWEEN 56K AND V.34 TECHNOLOGYDIFFERENCE BETWEEN 56K AND V.34 TECHNOLOGY
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1818
REMOTE ACCESSREMOTE ACCESS
56K DIAL UP MODEM REQUIREMENTS56K DIAL UP MODEM REQUIREMENTS
DIGITAL AT ONE END.DIGITAL AT ONE END.
56K TECHNOLOGY SUPPORT AT BOTH 56K TECHNOLOGY SUPPORT AT BOTH ENDS.ENDS.
ONE ANALOG TO DIGITAL CONVERSIONONE ANALOG TO DIGITAL CONVERSION..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 1919
REMOTE ACCESSREMOTE ACCESS
DEVELOPED BY DEVELOPED BY ROCKWELL AND ROCKWELL AND LUCENT.LUCENT.
DEVELOPED BY DEVELOPED BY US ROBOTICS AND US ROBOTICS AND 3COM.3COM.
THE 56K MODEM TECHNOLOGY SUPPLIERSTHE 56K MODEM TECHNOLOGY SUPPLIERS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2020
REMOTE ACCESSREMOTE ACCESS
DISADVANTAGES OF 56K MODEMSDISADVANTAGES OF 56K MODEMS
USEFUL ONLY FOR INTERNET DOWNLOADS.USEFUL ONLY FOR INTERNET DOWNLOADS.
NO STANDARDIZATION FROM ITU-IT.NO STANDARDIZATION FROM ITU-IT.
NO VIDEOCONFERENCING AND MULTIMEDIA NO VIDEOCONFERENCING AND MULTIMEDIA APPLICATIONS POSSIBLE.APPLICATIONS POSSIBLE.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2121
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2222
REMOTE ACCESSREMOTE ACCESS
WHAT IS CABLE MODEM TECHNOLOGY ?WHAT IS CABLE MODEM TECHNOLOGY ?
HIGH SPEED DATA TRANSFER VIA THE HIGH SPEED DATA TRANSFER VIA THE BROADBAND CABLE TV NETWORK.BROADBAND CABLE TV NETWORK.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2323
REMOTE ACCESSREMOTE ACCESS
TYPICAL SCENARIO…..TYPICAL SCENARIO…..
TWISTED PAIRTWISTED PAIR
SERIALSERIAL CABLECABLE
COAXIAL COAXIAL CABLECABLE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2424
REMOTE ACCESSREMOTE ACCESS
WITH CABLE MODEM TECHNOLOGY….WITH CABLE MODEM TECHNOLOGY….
TWISTED PAIRTWISTED PAIR
COAXIAL COAXIAL CABLECABLE
CABLECABLE MODEMMODEM
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2525
REMOTE ACCESSREMOTE ACCESS
WHAT IS A CABLE MODEM ?WHAT IS A CABLE MODEM ? ACTS AS A BRIDGE, SPANNING THE CABLE MEDIA’S ACTS AS A BRIDGE, SPANNING THE CABLE MEDIA’S
ACCESS PROTOCOL AND THE PC’S COMMUNICATION ACCESS PROTOCOL AND THE PC’S COMMUNICATION PROTOCOL.PROTOCOL.
OPERATES AT LAYER 1 AND LAYER 2.OPERATES AT LAYER 1 AND LAYER 2. HAS CONNECTORS FOR POWER,VIDEO F AND ETHERNET HAS CONNECTORS FOR POWER,VIDEO F AND ETHERNET
CONNECTOR.CONNECTOR.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2626
REMOTE ACCESSREMOTE ACCESS
CABLE TV PRIMERCABLE TV PRIMER
COAXIAL CABLES:-330Mhz or 450MHz.COAXIAL CABLES:-330Mhz or 450MHz. DOWNSTREAM VIDEO:-50Mhz-750Mhz.DOWNSTREAM VIDEO:-50Mhz-750Mhz. UPSTREAM VIDEO:-5Mhz-42Mhz.UPSTREAM VIDEO:-5Mhz-42Mhz. STANDARD TV CHANNEL OCCUPIES 6Mhz.STANDARD TV CHANNEL OCCUPIES 6Mhz. TRADITIONAL TV SYSTEM:-60 CHANNELSTRADITIONAL TV SYSTEM:-60 CHANNELS..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2727
REMOTE ACCESSREMOTE ACCESS
BANDWIDTH ALLOCATION ….BANDWIDTH ALLOCATION ….
5Mhz5Mhz42Mhz42Mhz
50Mhz50Mhz
750Mhz750Mhz
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2828
REMOTE ACCESSREMOTE ACCESS
CABLE MODEM SPEEDSCABLE MODEM SPEEDS
36M b p s U S IN G 256Q A M
D O W N S T R E A M D A T A50M hz - 750M hz
500K b p s U S IN G 16Q A M 10M b p s U S IN G Q P S K
U P S T R E A M D A T A5M hz - 42M hz
S IN G L E 6M hz T V C H A N N E L
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 2929
REMOTE ACCESSREMOTE ACCESS
VENDOR PRODUCTDOWN-STREAM
UP-STREAM
3COM3COM CableModem
30Mbps 2.6Mbps
3COMUS RoboticsCableAccess
30MbpsTelcoReturn
Baynetworks
LANCity 10Mbps 10Mbps
CableTron CatNET 30Mbps 2.5Mbps
COM21 ComPort 30Mbps 2.6Mbps
HayesULTRACableModem
5MbpsTelcoReturn
Motorola CyberSurfer 30Mbps 768Kbps
CABLE MODEM SPEEDSCABLE MODEM SPEEDS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3030
REMOTE ACCESSREMOTE ACCESS
SERVICES PROVIDED BY CABLE MODEMSSERVICES PROVIDED BY CABLE MODEMS
INTERNET ACCESSINTERNET ACCESS
ELECTRONIC MAILELECTRONIC MAIL
REMOTE ACCESS TO CORPORATE LAN.REMOTE ACCESS TO CORPORATE LAN.
Contd….Contd….
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3131
REMOTE ACCESSREMOTE ACCESS
SERVICES……SERVICES……
INTEGRATED COMPUTER/TV ACCESS.INTEGRATED COMPUTER/TV ACCESS.
BANK AT HOME SERVICES.BANK AT HOME SERVICES.
HOME ENTERTAINMENT.HOME ENTERTAINMENT.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3232
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3333
REMOTE ACCESSREMOTE ACCESS
CABLE MODEM NETWORK:-AN EXAMPLECABLE MODEM NETWORK:-AN EXAMPLE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3434
REMOTE ACCESSREMOTE ACCESS
EXPLANATION….EXPLANATION…. SuperHeadend:-Heart of the SystemSuperHeadend:-Heart of the System LCp:-Personal Cable ModemLCp:-Personal Cable Modem LCw:-Workgroup Cable Modem.LCw:-Workgroup Cable Modem. LCb:-Multiuser Cable Modem.LCb:-Multiuser Cable Modem.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3535
REMOTE ACCESSREMOTE ACCESS
CABLE MODEMS:--AVERAGE COSTCABLE MODEMS:--AVERAGE COST
M O D E M C O S T($500 - $1500)
IN T E R N E T A C C O U N TS E T U P F E E$200 - $400
F IX E D C O S T S
256K b p s:--$399/M on th512K b p s:--$599/M on th768K b p s:--$799/M on th1 .5M b p s:--$1499/M on th
B A N D W ID T H C O S T S
T O T A L C O S T
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3636
REMOTE ACCESSREMOTE ACCESS
00.5
11.5
22.5
33.5
425
6Kbp
s
1.54
4Mbp
sCABLE MODEMISDN
BANDWIDTH COST COMPARISONBANDWIDTH COST COMPARISON
$/Kbps$/Kbps
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3737
REMOTE ACCESSREMOTE ACCESS
1. Time Warner Cable 1. Time Warner Cable 29,00029,000
2. MediaOne 17,000 2. MediaOne 17,000 14,000 14,000
3. Cox Communications 3. Cox Communications 16,00016,000
4. Rogers Cablesystems 4. Rogers Cablesystems 14,000 14,000
5. Comcast 5. Comcast 5,800 5,800
6. Videotron 6. Videotron 5,0005,000
7. Shaw Communications 7. Shaw Communications 4,500 4,500
8. COGECO8. COGECO 4,0004,000
9. Tele-Communications Inc. 9. Tele-Communications Inc. 2,4002,400
10. Adelphia 10. Adelphia 2,0002,000
11. Cablevision Systems 11. Cablevision Systems 1,400 1,400
12. Jones Intercable 12. Jones Intercable 4,0004,000
Other Other 4,0004,000
TOTAL TOTAL 111,100111,100
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3838
REMOTE ACCESSREMOTE ACCESS
CABLE MODEM--SUBSCRIBER PROJECTIONSCABLE MODEM--SUBSCRIBER PROJECTIONS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 3939
REMOTE ACCESSREMOTE ACCESS
CABLE MODEMS:--UNIT SALES PROJECTIONSCABLE MODEMS:--UNIT SALES PROJECTIONS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4040
REMOTE ACCESSREMOTE ACCESS
DISADVANTAGES OF CABLE MODEMSDISADVANTAGES OF CABLE MODEMS HUGE INVESTMENT BY MSO.HUGE INVESTMENT BY MSO. RELIABLE MANAGEMENT SYSTEM RELIABLE MANAGEMENT SYSTEM
REQUIRED.REQUIRED. NO INTEROPERABILITY BETWEEN NO INTEROPERABILITY BETWEEN
DIFFERENT MODEMS.DIFFERENT MODEMS. UPSTREAM SPEEDS NOT STANDARDIZED.UPSTREAM SPEEDS NOT STANDARDIZED.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4141
REMOTE ACCESSREMOTE ACCESS
PRESENT SCENARIOPRESENT SCENARIO NO STANDARDS.NO STANDARDS. PRESENT CUSTOMERS ARE MSO’s.PRESENT CUSTOMERS ARE MSO’s. NO SUPPLIERS TO PROVIDE END NO SUPPLIERS TO PROVIDE END
TO END SOLUTIONS.TO END SOLUTIONS.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4242
REMOTE ACCESSREMOTE ACCESS
CABLE MODEMS--FUTURECABLE MODEMS--FUTURE STANDARDIZATION FOR DOWNSTREAM STANDARDIZATION FOR DOWNSTREAM
AND UPSTREAM SPEEDS.AND UPSTREAM SPEEDS. INTEROPERABILITY BETWEEN DIFFERENT INTEROPERABILITY BETWEEN DIFFERENT
MODEMS.MODEMS. REDUCTION IN COSTS.REDUCTION IN COSTS. CUSTOMERS WILL BE END USERS.CUSTOMERS WILL BE END USERS. SUPPLIERS WITH END TO END SOLUTIONS.SUPPLIERS WITH END TO END SOLUTIONS.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4343
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4444
REMOTE ACCESSREMOTE ACCESS
WHAT IS ADSL ?WHAT IS ADSL ? ASYNCHRONOUS DIGITAL SUBSCRIBER LINE--- ASYNCHRONOUS DIGITAL SUBSCRIBER LINE---
A NEW MODEM TECHNOLOGYA NEW MODEM TECHNOLOGY..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4545
REMOTE ACCESSREMOTE ACCESS
ADSL FEATURESADSL FEATURES
HIGH SPEED NETWORK ACCESSIBILITY.HIGH SPEED NETWORK ACCESSIBILITY. HIGH SPEED REMOTE ACCESS.HIGH SPEED REMOTE ACCESS. VIDEO ON DEMAND.VIDEO ON DEMAND. CONSTANT CONNECTIVITY.CONSTANT CONNECTIVITY. NO NEED TO ADD NEW PHONE LINES.NO NEED TO ADD NEW PHONE LINES.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4646
REMOTE ACCESSREMOTE ACCESS
ADSL :- THE NETWORKADSL :- THE NETWORK
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4747
REMOTE ACCESSREMOTE ACCESS
ADSL MODEMS ADSL MODEMS CONSISTENT WITH CONSISTENT WITH EUROPEAN AND NORTH EUROPEAN AND NORTH AMERICAN DIGITAL AMERICAN DIGITAL HIERARCHIES.HIERARCHIES.
VARIABLE DATA RATES.VARIABLE DATA RATES.
ADSL….SPEEDSADSL….SPEEDS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4848
REMOTE ACCESSREMOTE ACCESS
TECHNOLOGY DESCRIPTION…RequirementsTECHNOLOGY DESCRIPTION…Requirements FULL USE OF COPPER LINE FREQUENCY FULL USE OF COPPER LINE FREQUENCY
SPECTRUM(1.1Mhz).SPECTRUM(1.1Mhz). ADVANCED CODING/DECODING METHOD.ADVANCED CODING/DECODING METHOD. ABILITY TO WORK WITH POTS ON SAME ABILITY TO WORK WITH POTS ON SAME
COPPER LINE.COPPER LINE. AN EFFICIENT ERROR CORRECTION CODEAN EFFICIENT ERROR CORRECTION CODE..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 4949
REMOTE ACCESSREMOTE ACCESS
TECHNOLOGIES USED BY ADSLTECHNOLOGIES USED BY ADSL
CODING:--DMT OR CAPCODING:--DMT OR CAP CODE AND ERROR CORRECTIONCODE AND ERROR CORRECTION FRAMING AND SCRAMBLINGFRAMING AND SCRAMBLING
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5050
REMOTE ACCESSREMOTE ACCESS
ADSL:--BANDWIDTH ALLOCATIONADSL:--BANDWIDTH ALLOCATION
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5151
REMOTE ACCESSREMOTE ACCESS
ADSL:--CODING SCHEMESADSL:--CODING SCHEMES
D M TD IS C R E T E M U L T IT O N E
C A PC A R R IE R L E S S A M P L IT U D E M O D U L A T IO N
A D S L C O D IN G S C H E M E S
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5252
REMOTE ACCESSREMOTE ACCESS
ADSL:--DMT CODING TECHNIQUEADSL:--DMT CODING TECHNIQUE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5353
REMOTE ACCESSREMOTE ACCESS
ADVANTAGES OF DMTADVANTAGES OF DMT
BETTER PERFORMANCEBETTER PERFORMANCE BIT RATE FLEXIBILITYBIT RATE FLEXIBILITY RESISTANCE TO IMPULSE NOISERESISTANCE TO IMPULSE NOISE ATM SUPPORTATM SUPPORT
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5454
REMOTE ACCESSREMOTE ACCESS
ADSL:--DISTANCE LIMITATIONSADSL:--DISTANCE LIMITATIONS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5555
REMOTE ACCESSREMOTE ACCESS
CompanyStandard
Max.Downstream(Kbps)
Max.Upstream(Kbps)
ErrorCorrection
Alcatel DMT 6144 640 ReedSolomon
AnalogDevices
DMT 6144 224 ReedSolomon
GlobeSpan
CAP 7168 1088 ReedSolomon inD.s and 2-D,8 stateTrellis forDS andUS.
MetaLink DMT 2100 160 ReedSolomon
Motorola DMT 8000 1000 ReedSolomon
ADSL PRODUCTS FROM COMPANIESADSL PRODUCTS FROM COMPANIES
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5656
REMOTE ACCESSREMOTE ACCESS
ADSL :-- WHAT IS NEEDED ?ADSL :-- WHAT IS NEEDED ?
A D S L M O D E MP O T S S P L IT T E R
U S E R
D S L A MB IL L IN G S Y S T E M
D IA G N O S T IC S ,N M S
S E R V IC E P R O V ID E R
A D S L E Q U IP M E N T F O R ...
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5757
REMOTE ACCESSREMOTE ACCESS
ADSL PROVIDER IN HOUSTONADSL PROVIDER IN HOUSTON SOUTH WESTERN BELLSOUTH WESTERN BELL
TEST SITE:-SHELLTEST SITE:-SHELLSERVICES CITY USERS SPEED EQUIP.
ADSL HOUSTON 50 1.5Mbps64Kbps
AlcatelMotorola
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5858
REMOTE ACCESSREMOTE ACCESS
Name Meaning Data Rate Mode ApplicationV.22V.32V.42
Voice Band Modems 1200bps to28,800 bps
Duplex Data Communications
DSL Digital Subscriber Line 160kbps Duplex ISDN Service,Voiceand Datacommunications
HDSL High data rate DigitalSubscriber line
1.544Mbps2.048mbps
Duplex T1/E1 Service,WANAccess,Server Access
SDSL Single line SubscriberLine
1.544Mbps2.048Mbps
Duplex Same as above
ADSL Asymmetric DigitalSubscriber Line
1.5 to 9Mbps16to 640kbps
DownUp
LAN Access,Video ondemand,InteractiveMultimedia
VDSL Very High Data RateDigital Subscriber Line
13to52 Mbps1.5to2.3Mbp
DownUp
Same as ADSL plusHDTV.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 5959
REMOTE ACCESSREMOTE ACCESS
ADSL :-ISSUES TO BE RESOLVEDADSL :-ISSUES TO BE RESOLVED
HIGH SPEED xDSL,WHICH ONE?HIGH SPEED xDSL,WHICH ONE? LAYER 1 CAP vs DMTLAYER 1 CAP vs DMT LAYER 2 ATM vs ETHERNETLAYER 2 ATM vs ETHERNET LAYER 3 PPP OR NOT?LAYER 3 PPP OR NOT?
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6060
REMOTE ACCESSREMOTE ACCESS
GLOBAL SYSTEM FOR MOBILEGLOBAL SYSTEM FOR MOBILE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6161
REMOTE ACCESSREMOTE ACCESS
OVERVIEW OF THE CELLULAR SYSTEMOVERVIEW OF THE CELLULAR SYSTEM
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6262
REMOTE ACCESSREMOTE ACCESS
OVERVIEW OF CELLULAR CONCEPTOVERVIEW OF CELLULAR CONCEPT
HEXAGON GEOMETRYHEXAGON GEOMETRY EACH CELL HAS TRANSMITTEREACH CELL HAS TRANSMITTER FREQUENCY REUSEFREQUENCY REUSE HANDOFFHANDOFF
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6363
REMOTE ACCESSREMOTE ACCESS
WHAT IS GSM ?WHAT IS GSM ?
A Second Generation Cellular System.A Second Generation Cellular System. First Digital Cellular System.First Digital Cellular System. Supports mobile communications in the Supports mobile communications in the
900Mhz and 1.8Ghz range.900Mhz and 1.8Ghz range.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6464
REMOTE ACCESSREMOTE ACCESS
GSM:-SERVICES AVAILABLE NOWGSM:-SERVICES AVAILABLE NOW
TELESERVICES.TELESERVICES. DATA SERVICES:Packet Switched Data DATA SERVICES:Packet Switched Data
at 300bps-9.6Kbps.at 300bps-9.6Kbps. ISDN SERVICES.ISDN SERVICES.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6565
REMOTE ACCESSREMOTE ACCESS
GSM FUTUREGSM FUTURE
H S C S DH igh S p eed C ircu it
S w itch ed D ata
G P R SG en eral P acketR ad io S erv ices
H IG H S P E E D D A T AT H R O U G H G S M
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6666
REMOTE ACCESSREMOTE ACCESS
GSM-HSCSDGSM-HSCSD
High Speed Circuit Switched Data.High Speed Circuit Switched Data. Will boost user Capacity to 64Kbps.Will boost user Capacity to 64Kbps. Designed for existing Infrastructure.Designed for existing Infrastructure.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6767
REMOTE ACCESSREMOTE ACCESS
GSM-GPRSGSM-GPRS General Packet Radio ServiceGeneral Packet Radio Service Suitable for Bursty nature data Suitable for Bursty nature data
transmission.transmission. Ideal for e-mail and Database access.Ideal for e-mail and Database access. Cost effective.Cost effective. Connectivity at 64Kbps.Connectivity at 64Kbps.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6868
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 6969
REMOTE ACCESSREMOTE ACCESS
GEO LEO
Revolves at a distance of22,300 above earth.
Revolve at an orbit close tothe earth.
Single satellite can coverthe earth.
Many satellites are requiredto cover the earth.
Signal delay. Negligible signal delay.
SATELLITE BASICSSATELLITE BASICS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7070
REMOTE ACCESSREMOTE ACCESS
C -B A N D (3.4G h z-7G h z)L ow T ran . P ow erC over W id e A reas
L arger R ecep tion D ish
K u -B A N D (10.7G h z-14 .5G h z)H igh er T ran .P ow erC over S m all A reas
S m all D ish
K a B A N DF ib er like S ervice20-30G h z ran ge
S A T E L L IT E B A N D S
SATELLITE COMMUNICATION BANDSSATELLITE COMMUNICATION BANDS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7171
REMOTE ACCESSREMOTE ACCESS
Applicant # of Sats Cost System CapacityAT&T (VoiceSpan) 12 confidential 100,000 386 kbps channelsLockheed Martin(Astrolink)
9 $3.75 billion 90,000 386 kbps channels
GE American(GE*Star)
9 confidential not provided
Motorola (Millenium) 4 $2.3 billion 1 million 16 kbps channelsHughes(Spaceway/Galaxy)
17 $6.2 billion 100,000 384 kbps channels or 2.4million phone calls
Morningstar 4 $847 million 600 compressed video channelsTeledesic 840 $9 billion 2 million phone callsSS/Loral (Cyberstar) 3 $1.05 billion 6.75 GHz of effective bandwidth
Echostar 2 $340 million not providedKaStar 2 $645 million 12 GHz of effective bandwidthNetSat 28 1 $250 million 500,000 1.544 Mbps channelsOrion F-7, 8, 9 3 $757 million not providedPanAmSat 10, 11 2 $409 million not providedVisionStar 1 $207.5 million 100 video channels
Applicant # of Sats Cost System CapacityAT&T (VoiceSpan) 12 confidential 100,000 386 kbps channelsLockheed Martin(Astrolink)
9 $3.75 billion 90,000 386 kbps channels
GE American(GE*Star)
9 confidential not provided
Motorola (Millenium) 4 $2.3 billion 1 million 16 kbps channelsHughes(Spaceway/Galaxy)
17 $6.2 billion 100,000 384 kbps channels or 2.4million phone calls
Morningstar 4 $847 million 600 compressed video channelsTeledesic 840 $9 billion 2 million phone callsSS/Loral (Cyberstar) 3 $1.05 billion 6.75 GHz of effective bandwidth
Echostar 2 $340 million not providedKaStar 2 $645 million 12 GHz of effective bandwidthNetSat 28 1 $250 million 500,000 1.544 Mbps channelsOrion F-7, 8, 9 3 $757 million not providedPanAmSat 10, 11 2 $409 million not providedVisionStar 1 $207.5 million 100 video channels
Ka BAND SATELLITE PROJECTSKa BAND SATELLITE PROJECTS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7272
REMOTE ACCESSREMOTE ACCESS
IRIDIUM LEO SATELLITE SYSTEMIRIDIUM LEO SATELLITE SYSTEM Motorola’s Global Mobile Satellite Project.Motorola’s Global Mobile Satellite Project. Communication System for Voice,Data Fax and Paging.Communication System for Voice,Data Fax and Paging. 66 LEO Satellites.66 LEO Satellites. Multiple Access Scheme:-FDMA/TDMA.Multiple Access Scheme:-FDMA/TDMA. Frequency Band:-Ka Band(19.4-19.6Ghz for Downloads)Frequency Band:-Ka Band(19.4-19.6Ghz for Downloads)
Ka Band(29.1-29.3Ghz for uplinks)Ka Band(29.1-29.3Ghz for uplinks)
L-Band(161Mhz)L-Band(161Mhz) Year of Operation:-1998Year of Operation:-1998
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7373
REMOTE ACCESSREMOTE ACCESS
IRIDIUM SATELLITE SYSTEMIRIDIUM SATELLITE SYSTEM
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7474
REMOTE ACCESSREMOTE ACCESS
THE TELEDESIC NETWORKTHE TELEDESIC NETWORK
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7575
REMOTE ACCESSREMOTE ACCESS
TELEDESIC NETWORK-FEATURESTELEDESIC NETWORK-FEATURES Broadband Network of LEO Satellites.Broadband Network of LEO Satellites. 288 LEO Satellites.288 LEO Satellites. Frequency Band:--KaFrequency Band:--Ka Uplink Frequency:-18.8Ghz-19.3GhzUplink Frequency:-18.8Ghz-19.3Ghz DownLink Frequency:-28.6Ghz-29.1GhzDownLink Frequency:-28.6Ghz-29.1Ghz
Contd…..Contd…..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7676
REMOTE ACCESSREMOTE ACCESS
TELEDESIC…...TELEDESIC…... SPEEDS:-UPLINK-2MbpsSPEEDS:-UPLINK-2Mbps
Downlink-640KbpsDownlink-640Kbps Uses fast Packet Switching.Uses fast Packet Switching. Bandwidth on demand.Bandwidth on demand. Multiple access technique:-TDMAMultiple access technique:-TDMA High Mask Angle:-40High Mask Angle:-40
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7777
REMOTE ACCESSREMOTE ACCESS
THE HUGHES GEO NETWORKTHE HUGHES GEO NETWORK Broadband Satellite Network using GEO.Broadband Satellite Network using GEO. 8 GEO Satellites.8 GEO Satellites. Frequency Band:-Ka(17.7Ghz-30Ghz).Frequency Band:-Ka(17.7Ghz-30Ghz). Uplink Speeds:-6Mbps.Uplink Speeds:-6Mbps. Intersatellite Links Intersatellite Links Interoperability with terrestrial networksInteroperability with terrestrial networks..
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7878
REMOTE ACCESSREMOTE ACCESS
THE HUGHES NETWORK……THE HUGHES NETWORK…… Bandwidth On Demand.Bandwidth On Demand. Uses Spot Beam Technology.Uses Spot Beam Technology. Service Begins in 2001.Service Begins in 2001.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 7979
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8080
REMOTE ACCESSREMOTE ACCESS
BANDWIDTH ON DEMANDBANDWIDTH ON DEMAND
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8181
REMOTE ACCESSREMOTE ACCESS
VSATVSAT
Stands For Very Small Aperture Stands For Very Small Aperture Terminal.Terminal.
Satellite driven Service.Satellite driven Service. Network consists of Hubs,Outdoor Units.Network consists of Hubs,Outdoor Units.
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8282
REMOTE ACCESSREMOTE ACCESS
VSAT NETWORKVSAT NETWORK
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8383
REMOTE ACCESSREMOTE ACCESS
VSAT-CONFIGURATIONVSAT-CONFIGURATION
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8484
REMOTE ACCESSREMOTE ACCESS
REMOTE ACCESS-FUTUREREMOTE ACCESS-FUTURE
10%5%
65%
15%5%
CABLE MODEM
ADSL
ANALOG MODEM
ISDN
SATELLITE
U.S Consumer Internet Access in 2002--Main Access MethodU.S Consumer Internet Access in 2002--Main Access Method
Source:-Gartner GroupSource:-Gartner Group
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8585
REMOTE ACCESSREMOTE ACCESS
15%
3%
45%
27%
10%ADSLCABLE MODEMANALOG MODEMISDNSATELLITE
REMOTE ACCESS-FUTUREU.S Enterprise Remote Access in 2002-Main Access MethodU.S Enterprise Remote Access in 2002-Main Access Method
Source:-Gartner GroupSource:-Gartner Group
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8686
REMOTE ACCESSREMOTE ACCESS
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8787
REMOTE ACCESSREMOTE ACCESS
BASICS :-GEOSTATIONARY SATELLITEBASICS :-GEOSTATIONARY SATELLITE
Datacom II Datacom II REMOTE ACCESSREMOTE ACCESS 8888
REMOTE ACCESSREMOTE ACCESS
SATELLITE COMMUNICATION BANDSSATELLITE COMMUNICATION BANDS