May Do xDSL & TriplePlay_Bai Dao Tao-BD

7/30/2019 May Do xDSL & TriplePlay_Bai Dao Tao-BD

1/99

Telecom Test & Optimization Expert

V Th Khnh - K s k thutBnh Dng, 12/2012

HST-3000

My o xDSL & TriplePlay


2/99


Chng trnh o to

Tng quan v my o HST-3000- - - - - - - - - - - - - - - - - -o kim ADSL2+ v VDSL2- - - - - - - - - - - - - - - - - - - - - - -o kim IPTV- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -o kim VoIP- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -o kim Data (Ethernet, Y.1564, HTTP)- - - - - - - - - - - - - -

Go to

Go to

Go to

Go to

Go to


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Tng quan v my o HST-3000


4/99

2008 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION4

HeadsetConnector

USB Connector

Ethernet Connector

Color GUI3.8 diagonal, 1/4 VGA,Color Active Matrix with backlight(readable in direct sunlight)

Status LEDs

MicrophoneSpeaker

Handheld, Rugged & Portable Lightweight - 1.3kg Weather resistant CE Mark

Pluggable Test ModulesModular Hardware, Scalable Software

SwappableBatteryUp to 8hrs Battery Life

SerialConnector

HST-3000 Platform


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2008 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION5

HST-3000 Color GUI


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HST-3000 Service Interface Modules (SIMs)

Field swappable modules: Ethernet ADSL2+ VDSL2

E1 E1 and Datacom combo DS3 and T1 combo

T1, ISDN PRI, Frame Relay WBII Copper G.SHDSL

ISDN BRI ISDN BRA

Field upgradable software:

Remote Operation MPLS Bluetooth

Wifi


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o kim ADSL2+/VDSL2 vi HST-3000


8/99


x

D S L

igital ubscriber ine

?

ADSL(Asymmetric DSL)

HDSL

(High-bit-rate DSL)

SHDSL(Symmetric

or Single-pair HDSL)VDSL

(Very-high-speed DSL)

RDSL/R-ADSL/R-HDSL(Rate-adaptive DSL)

MDSL(Multi-rate DSL)

ADSLlite

IDSL(ISDN DSL)

UADSL(Universal ADSL)

VoDSL(Voice over DSL)

CDSL(Consumer DSL)

HDSL2

G.lite SDSL(Single-pair HDSL)

AoP (ADSL over POTS) AoI (ADSL over ISDN)

G.shdsl

G.dot

Tng quan cng ngh xDSL

ADSL2

ADSL2+

VoDSL(Video over DSL)

Annex M

RE-ADSL(Reach-Extended ADSL)

VDSL2


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ADSL : Asymmetric Digital Subscriber Line ng dng ch yu hin ti l cung cp kt ni tc cao bng rng n

ngi s dng cui cho dch v Internet v Triple Play

DMT (Discrete Multi Tone modulation) l tiu chun m ho ng dy phbin nht c s dng ITU-T G.992.1 (ex. G.dmt)

Annex A: ADSL over POTS (AoP) Annex B: ADSL over ISDN (AoI)

C 2 dng ph tn s: Overlapped v non-overlapped Cc tiu chun mi c pht trin sau ny l ADSL2 and ADSL2+

ADSL Cc nt chnh


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ADSL2 v ADSL2+

L 2 s nng cp cho tiu chun ADSLITU-T: G.992.3 (ADSL2), G.992.4 (ADSL2lite), G.992.5 (ADSL2+)C kh nng tng thch ngc vi ADSLB sung: Tng tc truyn ti H tr ch IMUX (cung cp 4 ng truyn ti cho 1 thu bao) C thm cc ch nng lng mi, gip gim nng lng tiu th v gim

nhiu xuyn m.

C thm cc tnh nng gip cho vic chn on li t ATU-R d dng hn. H tr Channelized Voice over DSL (CVoDSL) Phng thc qun l ph tn s mi, gip gim nhiu.


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256 512 2048 4096 34782782

8 kBaud 4 kBaud

# of Tones

20.5 dBm

14.5 dBm

11.5 dBm

17.5 dBm

Tx Power

Analog Bandwidth1.1 2.2 8.8 12.0 17.6 30.0

DSP Power

MHz

A DS L

A D S L2+

VDSL2 8c

VDSL2 8d

VDSL2 8a

VDSL2 8b

VDSL212a,b

VDSL217a

VDSL230a

xDSL: Nng lng v Tn s


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xDSL - M hnh mng li

Customer Premises

Central Office

Splitter Filter

ADSL modem(ATU-R)

Copper

Line

DSLAM (ATU-C)

Splitter Filter

ATM / IP Network

PC

USB

LAN

Hub/Router

IP Video

Ethernet 10/100

Corporate

Remote AccessServer

Downstream2 - 8 Mbit/s

Upstream200 - 800 kbit/s Telephony/ISDN

PSTN /ISDN Network

POTS/ISDN

ATM or GigE

Service Provider 2e.g Video on Demand

Service Provider 1e.g. Internet


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xDSL v DMT (Discrete Multi Tone)

L tiu chun m ng dy c pdng ton cu cho ADSL

Tn hiu c tri ph bng rng

Tnh nng xo trn bit (Bit swapping)tng thch vi cc vn trn ng dy.

Duy tr BER


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DMT Bit Swapping

8

15# of Bits

Tones

Start-up(No noise) After start-up(with noise)

Adaptation: BER


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xDSL Nguyn l o kim

To understand the xDSL testing needs, webreak the service up into the following

sections...

Loop Splitter

Modem(xTU-R)

ATM Data Network

Network Element

Manager

Transmission Section - TP1

PPP Authentication Section - TP3

xDSL Service Section - TP2

End to End TCP/IP Section - TP4

Central Office

DSLAM (xTU-C)

RAS Gateway

Customer Premises

Service Provider


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ATM

xTU-R Replacement DSLAM

RAS IP Routing

ISP

TE Replacement

xDSL Testing

xTU-R Modem emulation All layer Testing DSL, ATM, PPP and IP Ethernet TE & Through Modes IP ping and Trace route PPPoA, PPPoE, PAP/CHAP Bit/tone and SNR/tone graphs Internet Web-browser / FTP through-put capability


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Menu o kim xDSL


18/99


xDSL modem emulate modeTrong ch gi lp Modem (Modem emulate mode), HST-3000 s kt cung, dy, thay th vai tr ca CPE (Customer Premise Equipment) (asFigures below)

Cc bc thc hin c bn:1. La chn ch Modem emulate mode v t cc thit lp2. Kt ni HST-3000 vo ng dy3. Tin hnh o


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xDSL modem emulate

Thit lp

DSL d l d


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Kt ni vo ng dy

xDSL modem emulate modem


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Kt qu

xDSL modem emulate modem

h ( d )


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xDSL Ch Data (Data mode)Trong ch Data (Data mode), HST-3000 s thay th ADSL Modem cakhch hng phn vng li v phn tch d liu.

Cc bc thit lp:1. La chn ch Data (Data mode) v t cc thit lp2. Kt ni HST-3000 vo ng dy3. Tin hnh o

DSL d d


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xDSL data mode

1. Nhn phm Configure

2. Chn phm mm Data, giao din thit lp Data s xut hin

La chn ch Data

+ Terminate: kt cui ng truyn.+ Through: cho php Data i qua sau khi phn tch.

DSL d d


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xDSL data mode

1. Nhn phm Configure

2. Giao din thit lp Data xut hin

Thit lp o

DSL d t d


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xDSL data mode

Thit lp Data v PPP+ IPoE/ IPoA+ PPPoE/ PPPoA+ ATM Loopback + IPoE MVC Video+ Bridged Ethernet

(used in Ethernet mode)+ ATM BERT

Setting VPI/ VCI

Customer profile:+ VPI/ VCI + User Name+ Password

xDSL data mode


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xDSL data mode

Thit lp WAN v LAN

xDSL data mode


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Telecom Test & Optimization Expert Page 27

xDSL data mode

Kt qu Data Sync

Datat ni d liu c thit lp

Data Kt ni d liu cha c thit

Ch Ethernet TE


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Ch Ethernet TETrong ch Ethernet TE, HST-3000 c th gi lp l mt tit b kt cui Ethernet (thay th PC hoc LAN). T , ngi dng c th s dng cctnh nng nh PING, Trace route, FTP, Web Browser kim tra kt ni.

Cc bc thit lp:1. La chn ch Ethernet TE.2. t cc thit lp3. Kt ni HST-3000 vo ng dy4. Thc hin bi o

Data setting PPP setting Ping setting Trace route setting LAN setting

Ch ETHERNET TE


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Ch ETHERNET TE

Kt qu

CPE Local Loop ADSL Router Internet

DHCP

Server

DHCP

Client

PING, FTP,TRACERT, Browser


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o kim IPTV vi HST-3000

Yu cu v bng thng ng vi dch v bng rng


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Yu cu v bng thng ng vi dch v bng rng

Service BWper ChannelNumber of Channels Total BW Notes

VoIP 102-128 kb/s 4 408-512 kb/s

G.711 - 64kb/s x

(1.6 2.0)(thm phn mo u)

StandardVideo (SDTV)

3 5 Mb/s

1.5 - 2.5Mb/s

3

9-15 Mb/s

4.5-7.5 Mb/s

S dng MPEG-2Encoded SDTV

(MPEG-4 Rates)

High Def Video (HDTV)

19 Mb/s

6 Mb/s1-3

19-57Mb/s

6-18Mb/s

S dng MPEG-2encoded HDTV

(MPEG-4 Rates)

High SpeedData 0.5 10 Mb/s 1 0.5-10 Mb/s

Ph thuc vo nhucu ngi dng

Yu cu v bng thng cho dch v khi cung cp dch v Triple-Play

Tng: 11 36Mb/s

VideoIPTV T l


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Core

Network (ATM, IP)

GatheringNetwork

(IP)DSLAM

TV ProgramProviders

TV ProgramBroadcaster

Transport Network (IP)

Local Loop(DSL)

TV Broadcaster (MPEG-2/IP)

CPE (Ethernet)

Cust.

MDF

VOD Platform

IP

STB ATU-R

Faulty source,PCR jitter

IP Congestion, Delay & jitter ADSL &Copper

faults

STB overflow in-house

Wiring faults

Protocol errors

Subjec Percep

Latency

IPTV Topology

25% problem50% problem

Protocol Stacks

Typical Protocol Stacks for Broadcast and VOD service


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Physical

Datalink

Network

MPEG-2 TS

Application

VOD

TCP

RTP

UDP/TCP

Transport

HT T P

MPEG-2 (H.262, H.263) MPEG-4 p10 (H.264)

R T S P

Physical

Datalink

Network

PON, Fiber, 802.11, HPNA, MoCA,

10/100/1000, ADSL, or VDSL

Ethernet

IP

MPEG-2 TS

Broadcast

UDP

RTP

Transport

UDP

IGMP

Application

MPEG-2 (H.262, H.263) MPEG-4 p10 (H.264)

Typical Protocol Stacks for Broadcast and VOD service

Vid St F t MPEG-2 TS widelyadopted !!!


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Video Stream FormatMPEG-2 Transport Stream (TS)

Defined in ISO/IEC 13818

adopted !!!

Video Content in MPEG-2

MP4 H.264compression

Same header format regardless of payload compression

Analyze the header fields (TEI, PID, Continuity Error, PCR, etc.) of the TS to determine the video quality

UDP

TS video pkt

IP RTP

Also analyze RTP and IP layer in addition to TS

Stream Layer Continuity Error


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Continuity Error

Events of Missing packets, out of sequence packets andduplicate packets cause decoding error and could have bigimpact on video quality

Continuity Error video packet loss impact to video quality

Transaction Layer IGMP d RTSP L (D l )


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ATM Network

VOD

IGMP Latency (broadcast) Time to change channelRTSP Latency (VOD) Time from movie pause to play

IGMP and RTSP Latency (Delay)

IGMP Latency (Broadcast TV Channel Change)


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y ( g )Set-top box (STB) command processing time interval between the remote control action (button push) and the transmission of

the leave / join message to the network

Network delay interval between the transmission of the leave / join messages and the arrival of the first

multicast packet of the requested channel includes multicast signaling channel transmission, IGMP processing and stream

generation time

STB layer delay time needed by the STB IP stack to process incoming packets and deliver the content to

the MPEG decoder engine may include conditional access / decryption

STB jitter buffer delay time until the STB jitter buffer reaches the fullness set point prior to the forwarding of

the video signal to the decoder function

MPEG decoder delay time required for the decoding process

100s ms

100s ms

100s ms

10-100s

1s ms

Overall Total = 700 msec, 400 msec = Network

VideoIPTV I t ll ti & M i t


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CoreNetwork (ATM, IP)

GatheringNetwork

(IP)DSLAM

TV Program

Providers

TV Program

Broadcaster

MDF

IP

STB ATU-R

- Video stream acquisition check - Video QoS check - Troubleshooting according to Video Quality Layer Model

VODPlatform

IPTV Installation & Maintenance

IPTV testing modes


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IPTV testing modes

Emulate MODEM

Emulate MODEM & STB

Emulate STB

VideoIPTV Installation & Maintenance


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CoreNetwork (ATM, IP)

GatheringNetwork

(IP)DSLAM

TV Program

Providers

TV Program

Broadcaster

MDF

IP

STB ATU-R

- Video stream acquisition check - Video QoS check - Troubleshooting according to Video Quality Layer Model

VOD Platform

IPTV Installation & Maintenance

VideoTest in Terminate Mode


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Core Network (ATM, IP)

Gathering Network

(IP) DSLAM

TV Program Providers

TV Program Broadcaster

MDF

IP

STB ATU-R

1. STB emulation2. Modem + STB emulation

VOD Platform

Test in Terminate Mode

IPTV Test in Monitor mode


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In-service Monitoring A must to troubleshoot intermittent problems

In-service monitoring

In Through mode or with HubConfirm establishment of video data path Monitor signaling Monitor Channel Change latency Monitor / Analyze IP Video QoS Monitor Multiple Channel

Test in Monitor mode

DSLAM STB

Video

Modem

HUB

In-servicemonitoring

DSLAM STB

Video In-service monitoring

Modem + thru mode

Test the Application


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Test the Application

VoIP option Verify setup and provisioning Prove connectivity to and beyond

signaling gateways Ensure call quality

IP Video option Verify IP video provisioning and content

delivery Confirm establishment of video data

path Prove IP Video QoS In-service monitoring / through mode Monitor signaling & IGMP latency

Transport Layer MDI and RTP Packet Loss Statistics


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MDI and RTP Packet Loss Statistics

Key Video QoS


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The QoS screen shows the criticalquality parameters for a video flow:

PCR jitter measures this keyparameter; if high the decoder can notproperly decode the video payload:Pass < 100 mS

Latency is the IGMP / latency , the time

to change channels for BroadcastVideo: time from IGMP request to Rxof first video packet: 0 then content problem

Video MOS


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MOS score analysis for video andaudio portions:

Video factor is like audio R-Factor showing a score built from

network elements of the factorseffecting the MOS score .

The same analysis is provided forthe audio portion of the program.

Video Bandwidth & Pkt. Analysis


48/99


Individual bit rates are shownfor each portion of the videostream.

Unknown data defined as anydata, such as PAD bits tomaintain a constant data rate,or private IP data over MPEG,that is detected is also shown.Packet stats parameters aremeasured at the IP layer. IGMPLatency is the measure of thenetwork components to completea program change, i.e. changingthe channel in Broadcast video.


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51/99


o kim VoIP vi HST-3000

VoIP network


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Cc tham s nh hng n cht lng thoi


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Cc tham s khc:- m vng (echo), nhiu nn (background noise),- Loi ngn ng, gii tnh, mt gi.

Cc cch thc c bn nh gi cht lng VoIP


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nh gi cht lng VoIP theo ITU-T G.107 E-model


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E-model l gLoss model trong E-model?Delay model trong E-model?

E-model R-factor v MOSS tin trin ca m hnh E-model

E-model l g


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L m hnh tnh ton, c th c s dng tnh cht lng truydn 2 u thu bao VoIP.T l cht lng truyn dn chung a ra bi m hnh ny c dnchiu bi tham s R factor. R nm trong di 0-100 v c th c

nh x sang im MOS (Mean Opinion Score).c s dng cho vic quy hoch mng (network planning)v vico kim cht lng VoIP trong qu trnh s dng dch v.

Cng thc tnh E-modelR R Id I I A


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R = Ro Id Is Ie + A

Ro: gi tr R c bn (mc nhiu)Id: mc suy gim to nn tr khi giao tip (v d: m vng ca ngini/ngi nghe, tr tuyt i).Is: mc suy gim xy ra ng thi trong khi giao tip (v d: nhiu do qutrnh ly mu, mc m thoi nhn c, )Ie: mc suy gim thit b (v d: codec, packet loss, jitter)A: li (v d: 0 cho mng c dy, 10 cho mng GSM)

Loss model gn Loss vi Ie


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Delay model


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Tnh ton vi E-model


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nh x R factor (E-model) vi MOS


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S tin trin ca m hnh E-modelG 107 E model (05/2000)


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G.107 E-model (05/2000)

Da trn m hnh mt (loss model) Bernoulli, mc nh rng vic mt gi(packet loss) l ngu nhin.Mi s mt gi l c lp, khng lin quan n vic cc gi tin trc mthay khngCh c mt tham s mt t l mt gi trung bnh

S tin trin ca m hnh E-model (tip)Da trn m hnh 2 mc ca Markov hoc Gilbert


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Da trn m hnh 2 mc ca Markov hoc Gilbert.

Bao gm t l mt gi trung bnh v t l mt gi c iu kin (q i din ccm gi b mt)Chiu di cm gi mt trung bnh = 1/(1 gi tr mt lin tc) = 1/(1-q)

S tin trin ca m hnh E-model (tip)


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S tin trin ca m hnh E-model (tip)


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M hnh E-model m rng:Da trn m hnh 4 bc caMarkovThng gi tr Gmin=16 (tc l 16gi nhn c lin tip trc khigp mt li n, l gi tr mc ntrong m hnh E-model m rng).

S o Voice over IP (VoIP)


66/99


S dng my o HST-3000nh l VoIP phone

PSTN IP or ATM Network TrunkingGateway

P B X

PSTN

SS7

PSTN

NMS

TrunkingGateway

AccessGateway

S o f t s w i t c h

AccessGateway

P B X

SS7 Gateway

Softswitch

Signaling path

Data path

Thit lp o VoIP trn my o HST-3000


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Thit lp Audio/Codec

Thit lp cc ngng nh gi

Thit lp kt ni vo mng

Thit lp Proxy

Tin hnh o VoIP trn HST-3000


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Quan st kt qu o VoIP trn HST-3000


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71/99


o kim Data vi HST-3000

HST Ethernet SIM Introduction

D l O ti l P t


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Dual Optical PortsUses swappable Small Form Pluggable (SFP) opticsOnly enabled if Optical option is purchasedSupports 1000 LX/SX/ZX as well as 100 FX/LX

Dual Electrical PortsSupports 10/100 BT as well as 1000 BTEach port has embedded sync and activity LEDs

Physical Layer Check the physical layer by verifying Optical Power and performing Cable Diagnostics

Transport Layer Perform testing of Ethernet and IP layers by

verifying throughput, frame/packet loss, packet jitter and delay SLA specifics

Application Layer Ensure high Quality of Customer Experience bytesting VoIP and Video

HST Ethernet: Test the Physical Cable


73/99


Electrical Cable DiagnosticsQuickly check the electrical cable Is the line active? Is it a cross over or straight through? Will the switch respond to a Class 1

power request? If there is a fault (open or short), the

unit will report cable pair affected, type

of fault, and distance to faultOptical Power Level

Verify the optical signal Is the signal present? Is it within the acceptable range? Power level screen shot

HST Ethernet: Test the Transport


74/99


Layer 2 Traffic Generation Test a switched or point-to-point network end-to-end Turn-up tests for throughput, latency, and loss

JDSU RangeExtender

1310 nm (up to 50 miles)850 nm

JDSU RangeExtender

CPECPE

850 nm

TrafficGeneration

Layer 3Loopback


Layer 3 Traffic Generation


75/99


Layer 3 Traffic Generation Test a routed or point-to-multipoint network Verify Connectivity

IP PING test (can do this today) - Count of Sent/Received Pings

Perform traceroute for verification of the path Verify Throughput (generate L3 traffic )

Bandwidth Utilization/Throughput Count of Tx/Rx packets, lost packets, checksum errors

Round-trip packet delay (layer-3loopback )

Core Routers

Edge Router Edge RouterAccess Switch Access Switch

TrafficGeneration

Layer 3Loopback

HST Ethernet: ITU-T Y.1564

ITU-T Y1564


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ITU-T Y.1564 Generate up to 8 fully independent streams Specify different VLANs, addresses, priorities for each Verifyclass of service priortization

Ethernet OC-3 / STM-1

Ethernet With different VLAN ID,Destination address,

TOS/DSCP, Frame sizeor utilization per stream

Stream 1 VLAN=10

Stream 2 VLAN=20

Stream 3 VLAN=30

Stream 4 VLAN=40

Stream 5 VLAN=50Stream 6 VLAN=60

Stream 7 VLAN=70

Stream 8 VLAN=80

Ethernet



77/99


Thru mode for in-line monitoring View live customer traffic Analyze errors Sectionalize between provider network and CPE network


RFC-2544 Auto Test


78/99


The RFC-2544 feature represents a benchmarking methodology for testing Ethernet linksHST-3000 performs four automated tests(per RFC-2544): Throughput Latency Back-to-back frame Frame LossRFC-2544 will represent a baseline for customers to verify quality of service, as defined in their Service Level Agreements.

Support RFC-2544 and Asymmetric RFC-2544with all parameters.

RFC-2544 and Asymmetric RFC-2544


79/99


New Asymmetric RFC2544 Test


80/99


5 Automated Tests Latency (Round trip delay) Back-to-back frames

(Asymmetric) Throughput (Asymmetric)

Frame Loss Rate (Asymmetric) Jitter (Asymmetric)

All Tests except latency aredone to a terminating tester

For latency one terminatingtester becomes a loop device

JDSU protocol between testersestablishes which is sending andwhich is receiving trafficUser selects if the upstream or downstream link is tested

Back-to-back / Throughput /Frame Loss Rate/ Jitter 10/100/1000MEthernet

10/100/1000MEthernet

Latency (Round Trip Delay)

o kim FTP/HTTP


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# FTP/HTTPURL: http://www.dantri.com.vnTransfer Count: 70656 bytesUpload Rate: 0 KbpsDownload Rate: 3949 KbpsTotal Time: 0.211 sPretransfer Time: 0.056 sName Lookup Time: 0.051 sStart Time: 0.068 sMessage: NONE


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83/99

Backup Slides


84/99


Signal to Noise Ratio (SNR) and DMT


85/99


Received Noise Power

Received Signal Power

Transmitted Signal Power

Frequency1.1 MHz 40 kHz

Signal to Noise Ratio (SNR)

Bits per tone

15

0

FDM (non overlapped) vsEcho Cancellation (overlapped) Spectrum


86/99


DMT Tone Index Frequency

Downstream Non-overlapped Spectrum

P

OT S

DownstreamOverlapped Spectrum

25.875 138 Frequency [kHz] 1 104

6 32 DMT Tone Index 256

EC: Upstream and downstream bandwidths overlap,requiring the use of echo cancellation to separate channels

FDM: Divides the 1 MHz Bandwidth into 3 disjoint regions using filters

Upstream

Requires echocancellation

Fast or Interleaved Transmission Mode (1)


87/99


Fast Interleaved

Low latency

Corrects small errors bursts

For delay sensitive,but not error ratesensitive applications

High latency

Corrects largeerror bursts

For error rate sensitive,but not delaysensitive applications

Greater Interleaving depthmeans greater latency

Explain Interleaving


Interleaving allows impulse hits to be corrected


88/99


1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 A B C D E F G

Original Coded Words

A B C D E F G

1 2 3 4 5 6 7

Interleaved Words

A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G

x x x x x x x Error burst

Interleaving Depth

Resulting Words before Error Correction

1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 A B C D E F G

Greater Interleaving depth means greater latency Impulse hits are spread out so that the FEC can correct

Back


Bit & ADSL ATU-C Transmitter Reference Model


89/99


Back

V-C

Reference Points

Input

Data

NTR

OAM

Mux/ SynchControl

CRC f

CRC i

Scram& FEC

Scram& FEC

A

Mux DataFrame

Interleaver

B

FEC Output DataFrame

ToneOrdering

Bits

C

Constellation Encoder input Data Frame

Constel-lation

encoder and

gainscaling

Bits &Gains

Z i i = 1 to 255

IDFT Output

Parallel to

Serial Buffer

10

n

480

511510

DAC and analogue

processing

ATU-R transmitter: Z i = 1 to 31n = 0 to 63


ADSL Superframe Structure - ATU-C Transmitter


90/99


Back

Frame0

Frame1

Frame2

Frame3

Frame67

Frame68

Sync Symbol . . . . . .

Superframe (17 ms)

CRC/ Syncbits

in fast

OAM bits

in fast

Frame34

Frame35 . . . . . .

OAM bits

in fast

OAM bits

in fast

Frame Data Buffer (68/69 x 0.25 ms)

Fast Data Buffer Interleaved Data Buffer

Fast Byte Fast Data FEC Redundancy Interleaved Data

1 byte RF bytes

N F bytes Points B or C

N I bytes Point C

K F bytes Point A

ADSL over POTS vs. ADSL over ISDN

ITU-T G.992.1 Annex A vs. Annex B


91/99


ITU-T G.992.1 Annex B , AoI SDN, Non-overlapped spectrum (FDM)

US 138kHz

DS 823kHz

1 6 32 64 256 138 280 1 104

80 120

PSD

ISDN 2B1Q 4B3T


PSD


ITU-T G.992.1 Annex A , AoP OTS, Non-overlapped spectrum (FDM)

1 6 32 256 138 1 104

25.875

US 112kHz DS 961kHz POTS

ADSL over POTS vs. ADSL over ISDN

NEXT Issue


92/99


US

US

DS

DS I S D N

P OT S

ADSL over ISDN

ADSL over POTS

US DS

DS I S D N

P OT S

US

ADSL over ISDN

ADSL over POTS

ADSLover

POTS

ADSLover

POTS

ADSLover

ISDN

ADSLover

ISDN

N E X T

N E X T

ExplainCrosstalk

ADSL2+ Doubles the Downstream Bandwidth


93/99


MHz

Upstream Downstream POTS/ ISDN

0.14 1.1 2.2

ADSL2

ADSL2+

ADSL2+ Can Be Used to Reduce Crosstalk


94/99


1.1 MHz

2.2

MHz 1.10.14

ADSL2

ADSL2+

CENTRALOFFICE

REMOTE TERMINAL

COMMON BINDER

ADSL2+ Doubles the Maximum Data Rate

30.0 ADSL2


95/99


Loop length (km)

D a t a r a

t e ( M b i t / s )

5.0

10.0

15.0

20.0

25.0 ADSL2 ADSL2+

1.0 2.0 3.0 0.5 1.5 2.5 3.5

ADSL2 and ADSL2+

The ADSL2 and ADSL2+ standards improve on the original

ADSL by offering higher downstream data rates and longer


96/99


Central Office

ADSL2 DSLAM

ADSL by offering higher downstream data rates and longer reach

Home Officewith ADSL2+

ADSL2 provides downstream datarates of more than 12 Mbit/s, while

extending ADSLs reach about 200m

ADSL2+ provides downstream data rates of 25 Mbit/s for loops up to 1,5 km long by

doubling the bandwidth used to carry traffic (up to 2.2 MHz)

Home Officewith ADSL2

CVoDSL vs. VoATM and VoIP


97/99


Customer Premises Network

Baseband POTS/ISDN

xDSL Physical Layer

AAL5 AAL5

PPP PPP

IP IP

ATM ATM

AAL2 AAL2

POTS/

ISDN

VoATM

VoIP

Channelized VoDSL

CVoDSL


98/99


kHz

Upstream Downstream POTS/ ISDN

Dedicated 64 kbit/s

PCM channel

Y!: thukhanhfc


99/99


Skype: thukhanhfc

Date post:	04-Apr-2018
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