AuroraPresto

Introduction

ADSL Technology Overview

& Product Presentation

Asymmetrical DSL

ADSL

GLite

RADSLAsymmetrical DigitalSubscriber Loop

SplitterlessADSL

RateAdaptiveADSL

VDSLVery high bit rate ADSL

Asymmetrical DSL

standard ADSL

standard offering requiring operator installation

GLite

splitterless for customer installation in PCs

RADSL

rate adaptive, maximising current line potential

VDSL

for use in business and residential blocks

Downstreambits/s

Upstream

bits/s

ADSL

G.Lite

RADSL

VDSL

640k

512k

128k – 1M

2M

8M

1.5M

1M – 12M

13M

Rangekm

6

1.5

6

6

- 26M 1.0

13M 52M 0.3

ADSL Line Performance

The Copper/Digital Local Loop

Exchange

DSL

NTU

DSL

LTUMDF CCP SDP

CustomerDigital Local Loop Premises

exchangecable

maincable

distribution

cable

installation

cable

ADSL technology overview

Carrier-less Amplitude Phase vs Discrete Multi-Tone Bundle interference (spectral incompatibility) Dynamic Retraining

ADSL technology overview

ADSL over POTS ADSL over ISDN Through-put (U/S:D/S rates)

ADSL technology overview

Typical ADSL applications

ATU-C/DSLAM

ATU-R/Customer

Typical ADSL applications

ADSL service limiting factors

Noise (conducted)

Noise (induced/RFI)

Cross-talk (Near/Far)

Inter-operability

Line code (CAP v DMT)

DSLAM/ATU-C settings

Balance

Load coils/taps

Hi Z/Lo Z

Non-uniform pairs

Pair length

Copper diameter

ADSL technology overview

Effects of noise on ADSL spectrum BIN retraining Problems: T1, E1, HDSL in same bundle

ADSL layered system technology

Copper Pair

DSL Modulation

ATM layer

IP layer

OptionalTCP/IP layer

Data transportLayer

Data LinkLayer

Link Hardware

Application layers:- MPEG3video, Internet access

protocols etc.

Multi-layer service presentation ADSL > ATM > IP > PPP Test needs - all technologies

Trend’s xDSL Products

DSL Service Testing

Analogue Copper Testing

Advanced Analogue Copper

Testing

ATM Test