1_OBA001010 ADSL2+ Technology In-depth ISSUE1.0

8/11/2019 1_OBA001010 ADSL2+ Technology In-depth ISSUE1.0

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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

www.huawei.com

Internal

OBA001010 ADSL 2+

Technology In-depthISSUE 1.0


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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 1

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?


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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.


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Chapter 1 ADSL Technology

Chapter 2 Major Features of ADSL2+

Chapter 3 ADSL2+ Products

Chapter 4 ADSL2+ Line Profile


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Development and Features of DSL

Development history of xDSL:

Digital Subscriber Line

Copper loop access technology

The middle of1970s The endof 1980sThebeginning of1990s

TimeThe end of 1990s

ISDN HDSL ADSL VDSLOtherxDSL

xDSL technology

ADSL 2+


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ADSL Overview

Features of ADSL

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

ADSL: Asymmetric Digital SubscriberLine

Transmit voice and datasimultaneously on a twisted pair

G.992.1(G.dmt)

Technicalspecification

of the full-rate ADSL

Technicalspecification of thefull-rate ADSL

Technicalspecification of the

splitterless ADSL

G.992.2(G.lite) T1.413

ADSL

standards

Twisted pair

PSTNInternet

Homenetwork

ATU-R

Splitter

DSLAM

ATU-C

Splitter


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Theoretical Basis of DSL

Scrambler

FECcoder Interleaver Modulator Shaping

DescramblerFEC

decoderDeinterle

averDemodul

atorEqualizer

Channel

Inputbits

Output bits

Receiver

Transmitter

Data communication system structure:

Reduce biterrors

0110111101001001101 011010010

01101111010010

ChannelModulation

01001010111010101

01101 011010010


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DSL Modulation Technology

DMT (discretemulti tone)

QAM: quadrature

amplitude modulation)

CAP (carrier-lessamplitude/phase)


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QAM Modulation Technology

Modulator Demodulator

4 input

bitsMap oneconstellationpoint

Transmitted

andreceived viachannels

Define a

waveform

Map one

constellation point

4 outputbits

Find the

nearest truepoint

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 anglerepresents the signal phase


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DMT Modulation Technology

16 31 64 256 1.1MHz

4.3125KHz

V oi c

e b an

d

26KHz

69 kHz: Uplink pilot

7

276 kHz: Downlink pilot

1

Uplink subcarriers

Downlink subcarriers

Available band SubchannelsData SNR Noise

attenuation


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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


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ADSL Standards

G.992.1 Annex A ADSL over POTS

25 kHz 138 kHz in the uplink and 138 kHz 1104 kHz in thedownlink. It falls into non-overlap and overlap and is used in mostplaces.

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 mainlyapplied in Japan.

G.992.2 G.Lite or splitterless ADSL

The uplink band is the same as Annex A, the downlink band is 138kHz 552 kHz, the transmission rate is 512 kbps in the uplink and1536 kbps in the downlink.


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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.


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Major Features of ADSL2+

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.


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Comparison between ADSL and ADSL2


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Spectral distribution of ADSL, ADSL2 and ADSL2+


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Rate comparison between ADSL2 and ADSL2+


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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.


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Distance comparison between ADSL andADSL2+


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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.


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Introduction to the ADSL2+ Technology5. 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.


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Introduction to the ADSL2+ Technology

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

The pilot is decided by the receiving end, so the problem that

the pilot cannot be activated due to line bridge tap or AMinterference can be avoided.

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


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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.


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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.


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9. Channelized voice over DSL technology


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Introduction to the ADSL2+ Technology10. Better interworking capability

ADSL2/ADSL2+ divides the ADSL transceiver by functions into multiplesublayers:

TPS-TC (Transmission Protocol Specific TransmissionConvergence) sublayer

PMS-TC (Physical Media Specific Transmission Convergence)sublayer

PMD (Physical Media Dependent) sublayer

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

Each sublayer is encapsulated and the messages between thesesublayers are defined. This helps the interworking among theequipment of different vendors.


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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


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Integrated Service SolutionIP 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 caf Government/school DDN access node

STM-1

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

FE/GE

SOHO Ordinary user

ATM Switch

MA5300 MA5600 MA5600

ADSL ADSL


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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,G992.5is prior)


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ADSL2+ Line Profile


New modes

6: G992.1

7: G992.2 8: G992.3

9: G992.4

10:G992.5


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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,G992.5is prior)


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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


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ADSL2+ Line Profile

Channel mode

0-interleaved

1-fast

2-fast or Interleaved3-fast and Interleave


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ADSL2+ Line Profile

Rate Adapt mode

1-fixed

2-adaptAtStartup

3-adaptAtRuntimeSRARelated 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]:


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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]:


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1_OBA001010 ADSL2+ Technology In-depth ISSUE1.0

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