1_OBA001010 ADSL2+ Technology In-depth ISSUE1.0.ppt

HUAWEI TECHNOLOGIES CO., LTD.

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OBA001010 ADSL 2+ Technology In-depth

ISSUE 1.0

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Introduction

Do you know the ADSL technology? What

functions and features does ADSL2+ have

as compared with ADSL?

What products can implement the

ADSL2+?

How are the related parameters of

ADSL2+ configured?


Upon completion this course, you will be able

to:

Master the ADSL2+ technology

Understand the related products of ADSL2+

Be familiar with the parameters of ADSL2+ line profile.


Chapter 1 ADSL TechnologyChapter 1 ADSL Technology

Chapter 2 Major Features of ADSL2+Chapter 2 Major Features of ADSL2+

Chapter 3 ADSL2+ Products Chapter 3 ADSL2+ Products

Chapter 4 ADSL2+ Line ProfileChapter 4 ADSL2+ Line Profile


Development and Features of DSL

Development history of xDSL:

Digital Subscriber Line

Copper loop access technology

The middle of 1970s

The end of 1980s

The beginning of 1990s

TimeThe end of 1990s

ISDN HDSL ADSL VDSL Other xDSL

xDSL technology

ADSL 2+


ADSL Overview

Features of ADSL

The uplink rate can be up to 640 kbps and the downlink rate can be up to 8 Mbps

ADSL: Asymmetric Digital Subscriber Line

Transmit voice and data simultaneously on a twisted pair

G.992.1(G.dmt)

Technical specification

of the full-rate ADSL

Technical specification of the full-rate ADSL

Technical specification of the splitterless

ADSL

G.992.2(G.lite) T1.413

ADSL

standards

Twisted pair

PSTNInternet

Home network

ATU-RSplitter

DSLAM

ATU-CSplitter


Theoretical Basis of DSL

ScramblerFEC coder

Interleaver Modulator Shaping

DescramblerFEC

decoderDeinterle

averDemodul

atorEqualizer

Channel

Input bits

Output bits

Receiver

Transmitter

Data communication system structure:

减少误码减少误码Reduce bit errors

0110111101001001101011010010

01101111010010

ChannelModulation01001010111010101

01101011010010


DSL Modulation Technology

DMT ： (discrete multi tone)

QAM:(quadrature amplitude modulation)

CAP ： (carrier-less amplitude/phase)


QAM Modulation Technology

Modulator Demodulator

4 input bits

Map one constellation point

Transmitted and received via channels

Define a waveform

Map one constellation point

4 output bits

Find the nearest “true point”

1101 1001

1100 1000

0001 0101

0000 0100

0010 0110

0011 0111

1110 1010

1111 1011

x

y

1101 1001

1100 1000

0001 0101

0000 0100

0010 0110

0011 0111

1110 1010

1111 1011

x

y

1010 1010

The distance represents the signal amplitude and the angle represents the signal phase


DMT Modulation Technology

16 31 64 2561.1MHz

4.3125KHz

Voice band

26KHz

69 kHz: Uplink pilot

7

276 kHz: Downlink pilot

1

Uplink subcarriers

Downlink subcarriers

Available band SubchannelsData SNR

Noise attenuation


Signal Splitting Technology

0-4KHz 26KHz

Common voice ADSL signal

Voice

Data

Low pass filter

High pass filter

Low pass filter

High pass filter

Twisted pair

User-end splitter CO splitter

PSTN

Internet

1

2

3

Voice

Data


ADSL Standards

G.992.1 Annex A —— ADSL over POTS ， 25 kHz – 138 kHz in the uplink and 138 kHz – 1104 kHz in the downl

ink. It falls into non-overlap and overlap and is used in most places.

G.992.1 Annex B —— ADSL over ISDN ， Application of ISDN and ADSL on the same twisted pair

G.992.1 Annex C ADSL in the TDD ISDN (G.961) crosstalk environment and is mainly

applied in Japan.

G.992.2 —— G.Lite or splitterless ADSL

The uplink band is the same as Annex A, the downlink band is 138 kHz – 552 kHz, the transmission rate is 512 kbps in the uplink and 1536 kbps in the downlink.


ADSL2/2+ Standards

G.992.3

ADSL2 is developed on the basis of ADSL and was formulated in June 2002.

G.992.3 Annex I and Annex J

The support for the full digital loop mode is added. Annex I applies when the line pair is POTS and Annex J applies when the line pair is ISDN.

G.992.3 Annex L

So-called long distance ADSL2

G.992.5

Downlink band from 1.104 MHz of ADSL2 to 2.208 MHz and expanded the tone number from 256 to 512. Therefore, the downlink rate has been greatly increased.


Major Features of ADSL2+

1. New running modes

It has the full digital mode Annex compatible with the frequency spectrum of

IADSL over POTS (annex A). At this time, there is no POTS service, the

uplink band is 3 kHz – 138 kHz, the tone number is 31 and the uplink band

exceeds 1 Mbps.



2. Higher transmission rate

It has improved the modulation rate and coding gain, reduced the frame

header overhead and improved the initial state machine, and uses the

enhanced the signal processing algorithm.



Comparison between ADSL and ADSL2



Spectral distribution of ADSL, ADSL2 and ADSL2+


Major Features of ADSL2+ Rate comparison between ADSL2 and ADSL2+


Major Features of ADSL2+3. Longer transmission distance

ADSL2/ADSL2+ supports the application with the distance no less than 6.5 km

and the rate is 192 kbps/96 kbps.



Distance comparison between ADSL and ADSL2+


Major Features of ADSL2+4. Much lower power consumption

By lowering the transmit power and reducing the noise margin beyond

the requirement, ADSL2+ reduces the useless power consumption on

the precondition of stable running.


Introduction to the ADSL2+ Technology 5. Staler running and good spectral compatibility

The receiver selects the best tone as the pilot according to the tone

ordering decided by the channel analysis result, so the ADSL connection is

much more stable.

The tone is closed in the training process and the RFI (Radio Frequency

Interference) distribution of the receiving end is tested, so RFI is well

avoided and the crosstalk to the other line pairs is reduced.

Good dynamic adaptability: Enhanced bit swap enables seamless

dynamic change of the line rate.


Introduction to the ADSL2+ Technology

The power cutback function with up to 40 dB at the receiver end and the transmitter end reduces the near-end echo and crosstalk.

The pilot is decided by the receiving end, so the problem that the pilot cannot be activated due to line bridge tap or AM interference can be avoided.

The training process is shortened and connection synchronization can be quickly recovered from errors.


Introduction to the ADSL2+ Technology6. Line diagnosis function

ADSL2+ supports the dual-ended test function. Training can be

conducted at the CO and the CPE, and line parameters can be

obtained through the special line test procedure.

7. Dynamic rate adaptation

ADSL2+ solves crosstalk, AM interference and other problems by use

of the SRA (Seamless Rate Adaptive) technology.



8. Rate binding function

In order to provide different levels of services for different

customers, ADSL2+ can bind two or more copper wires with one

ADSL connection through the IMA technology so as to flexibly

improve the access rate.



9. Channelized voice over DSL technology


Introduction to the ADSL2+ Technology10. Better interworking capability ADSL2/ADSL2+ divides the ADSL transceiver by functions into multiple

sublayers:

TPS-TC (Transmission Protocol Specific Transmission Convergence) sublayer

PMS-TC (Physical Media Specific Transmission Convergence) sublayer

PMD (Physical Media Dependent) sublayer

MPS-TC (Management Protocol Specific Transmission Convergence) sublayer used for the NM interface

Each sublayer is encapsulated and the messages between these sublayers are defined. This helps the interworking among the equipment of different vendors.


Huawei ADSL2+ Products DSLAM products of complete specifications:

MA5100

MA5300

MA5600

High density, high performance ADSL2+ boards

MA5100 32 × ADSL2+ board integrating the splitter (ADCE)

MA5300 48 × ADSL2+ board (EADB)

MA5600 64 × ADSL2+ board (ADEF)

ADSL2+ Terminal

MT880


Integrated Service Solution IP MAN ATM MAN

FR switch

IP MAN

ADSL VDSL E1 VDSL LAN FR/CES (E1/V.35)

MA5100

BAS

SOHO

iManager N2000

ATM MAN

Enterprise

AAA

Ordinary userInternet café Government/school DDN access node

STM-1

FE/GE STM-1STM-1FE/GE

FE/GE

SOHO Ordinary user

ATM Switch

MA5300 MA5600 MA5600

ADSL ADSL


ADSL2+ Line Profile

Activation standards

Compatible ADSL modes

− 0:All(G992.1,G992.2,G992.3,G992.4,G992.5,T1.413)

− 1: Full rate(G992.1,G992.3,G992.5 or T1.413)

− 2: G992.2(g.lite) G992.4(g.lite.bis)

− 3: T1.413

− 4: G992.1(g.dmt) G992.3(g.dmt.bis) G992.5

− 5: g.hs(G992.5,G992.3,G992.1,G992.4,G992.2,G992.5 is prior)


ADSL2+ Line Profile


New modes

− 6: G992.1

− 7: G992.2

− 8: G992.3

− 9: G992.4

− 10:G992.5


ADSL2+ Line Profile


New modes

− 0:All(G992.1,G992.2,G992.3,G992.4,G992.5,T1.413)

− 1: Full rate(G992.1,G992.3,G992.5 or T1.413)

− 2: G992.2(g.lite) G992.4(g.lite.bis)

− 3: T1.413

− 4: G992.1(g.dmt) G992.3(g.dmt.bis) G992.5

− 5:g.hs(G992.5,G992.3,G992.1,G992.4,G992.2,G992.5 is prior)


ADSL2+ Line Profile

Trellis mode

It must be enabled for ADSL2 and ADSL2+ Optional for ADSL

Bit Swap

It must be enabled if SRA is to be tested


ADSL2+ Line Profile

Channel mode

0-interleaved

1-fast

2-fast or Interleaved

3-fast and Interleave


ADSL2+ Line Profile

Rate Adapt mode

1-fixed

2-adaptAtStartup

3-adaptAtRuntime

SRARelated settings of SRA

Rate downshift margin in downstream (0~6 dB) [0]:

Rate upshift margin in downstream (6~31 dB) [31]:

Minimum time of rate upshift in downstream (0~16383 s) [0]:

Minimum time of rate downshift in downstream (0~16383 s) [0]:


ADSL2+ Line Profile

Rate

Minimum bit rate in downstream (32~28800 Kbps) [32]:

Maximum bit rate in downstream (32~28800 Kbps) [24544]:

Minimum bit rate in upstream (32~1560 Kbps) [32]:

Maximum bit rate in upstream (32~1560 Kbps) [1024]:


Summary

Upon completion we learned:

The functions of ADSL2+ have as compared with ADSL.

What products can implement the ADSL2+ technology.

Related parameters of ADSL2+ configured.

www.huawei.com

Thank You

1_OBA001010 ADSL2+ Technology In-depth ISSUE1.0.ppt

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