1. Aurora Presto Introduction ADSL Technology Overview & Product Presentation

2. Asymmetrical DSL ADSL GLite RADSL Asymmetrical Digital Subscriber Loop Splitterless ADSL Rate Adaptive ADSL VDSL Very high bit rate ADSL

3. 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

4. Downstream bits/s Upstream bits/s ADSL G.Lite RADSL VDSL  640k  512k 128k – 1M  2M  8M  1.5M 1M – 12M  13M Range km 6 1.5 6 6 -  26M 1.0  13M  52M 0.3 ADSL Line Performance

5. The Copper/Digital Local Loop Exchange DSL NTU DSL LTU MDFCCPSDP CustomerDigital Local Loop Premises exchange cable main cable distribution cable installation cable

6. ADSL technology overview  Carrier-less Amplitude Phase vs Discrete Multi-Tone  Bundle interference (spectral incompatibility)  Dynamic Retraining

7. ADSL technology overview  ADSL over POTS  ADSL over ISDN  Through-put (U/S:D/S rates)

8. ADSL technology overview

9. Typical ADSL applications ATU-C/DSLAM ATU-R/Customer

10. Typical ADSL applications

11. 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

12. ADSL technology overview  Effects of noise on ADSL spectrum  BIN retraining  Problems: T1, E1, HDSL in same bundle

13. ADSL layered system technology  Multi-layer service presentation  ADSL > ATM > IP > PPP  Test needs - all technologies

14. Trend’s xDSL Products DSL Service Testing Analogue Copper Testing Advanced Analogue Copper Testing ATM Test