1. Analyze Assure Accelerate TM Spirent Communications Overview

2. Analyze Assure Accelerate TM Who We Are… The Value We Add Spirent Communications is a worldwide provider of integrated performance analysis and service assurance systems for next- generation network technologies

3. Analyze Assure Accelerate TM Spirent Business Portfolio LSE / NYSE Listed 2004 revenue: £475 million ($870 million) Broadband Wireless and Positioning Performance Analysis Solutions Division Service Assurance Solutions Division Field Test Broadband Network Products Systems Spirent Communications Spirent plc

4. Analyze Assure Accelerate TM Spirent Communications One of the top 3 global telecom test companies 1,700 employees worldwide £252 million ($460 million) in annual revenue (2004) Headquartered in Rockville, Maryland, USA Parent company: Spirent plc  LSE: SPT / NYSE: SPM More than 1,500 customers worldwide

5. Analyze Assure Accelerate TM Spirent Communications’ Market Focus 3G wireless deployment Wireless location based services Broadband access xDSL Cable Fiber Access Networks IPv6 Metro Ethernet VoIP IP/MPLS core switching & routing 3G wireless infrastructure Metro/Core Networks 10/100 to Gigabit Ethernet upgrade eCommerce & Web applications - performance & security Storage area networks IP telephony Wireless LANs IPv6 Enterprise Networks  3G wireless deployment  3G wireless deployment

6. Analyze Assure Accelerate TM Applications R&D, Design Verification Field Trials DeploymentApplications R&D, Design Verification Field Trials Deployment Customers Mobile and Infrastructure Manufacturers Network Operators Technology Suppliers (ASICs/stacks) Test LabsCustomers Mobile and Infrastructure Manufacturers Network Operators Technology Suppliers (ASICs/stacks) Test Labs Spirent Wireless & Positioning Technologies UMTS / WCDMA IS-95 / CDMA2000 1X / 1xEV-DO WLAN GPS / PositioningTechnologies UMTS / WCDMA IS-95 / CDMA2000 1X / 1xEV-DO WLAN GPS / Positioning Experience A decade of leadership in RF and wireless testExperience

7. Analyze Assure Accelerate TM UMTS  3GPP RAN 4 RAN 5 GERAN 3 CDMA  CDG. Member since 1996  3GPP2. Chair of (IS-2000) Signaling Conformance Working Group Spirent Wireless & Positioning Others  PTCRB  OMA  Ad-hocs GCF  SG  CAG Spirent is a key contributor to industry standards:

8. Analyze Assure Accelerate TM Enabling 3G Success - In Practice Leading Carriers Leading Test Houses

9. Analyze Assure Accelerate TM Air Access for HSDPA Rev. 1.0

10. Analyze Assure Accelerate TM The information contained in this presentation is considered to be confidential and proprietary information of Spirent Communications Inc. and is subject to the terms and conditions of the Non- disclosure agreement (NDA) between the recipient(s) or recipient's organization and Spirent Communications Inc. Notice of Confidential Information

11. Analyze Assure Accelerate TM High Speed Data Market Snapshot To fulfill the “promise of 3G,” carriers must deliver high speed data  User experience that far exceeds 2G HSDPA is what the market is waiting for … … and it’s right around the corner!

12. Analyze Assure Accelerate TM Getting to HSDPA Carriers are just starting meaningful commercialization of R99… …but there are still a lot of challenges related to R99:  Inter-RAT handovers  Handset performance characterization  Energy management At the same time, HSDPA deployment schedules are accelerating.

13. Analyze Assure Accelerate TM HSDPA Functional Testing HSDPA is significantly different from R99 R99HSDPA Largely focused on dedicated channel (DCH) Shared channel (HS-DSCH) Fast power controlFast rate control QPSK modulationAdaptive modulation Slow retransmissions, high latencyFast retransmissions, low latency

14. Analyze Assure Accelerate TM HSDPA Functional Testing There are a limited number of HSDPA RF Conformance tests  TS34.121 Section 9 – six minimum performance tests (6/05) BUT… Key HSDPA aspects are not conducive towards conformance testing  MAC-hs scheduler – not defined in the standard  Performance is highly dependent on traffic load  Mobility management HS ↔ HS handovers (intra and inter-cell) HS ↔ R99, 2G handovers

15. Analyze Assure Accelerate TM HSDPA Functional Testing Conformance comprises 10-20% of an HSDPA test plan  Static conditions for basic functional verification For the rest, a flexible network emulator is required  Capable of capturing true real-world scenarios  Maintaining ease-of-use

16. Analyze Assure Accelerate TM HSDPA Functional Testing Demodulation of HS-DSCH HS-SCCH Detection Reporting of CQI Parametric tests

17. Analyze Assure Accelerate TM HSDPA Functional Testing Demodulation of HS-DSCH HS-SCCH Detection Reporting of CQI Adversarial Testing Dynamic environment testing R99 upshift/downshift HSDPA ↔ HSDPA handovers HARQ Testing Throughput testing Client/Application Testing Inter-TTI Distance MAC-d Testing MAC-hs Testing Energy Management Testing HSDPA ↔ R99 handovers Parametric tests HSDPA RAB reconfiguration Multi-RAB – PS+CS (HSDPA+voice) Cell loading tests Vary scheduler algorithm High layer interaction

18. Analyze Assure Accelerate TM Spirent’s HSDPA Expertise First-to-market with EV-DO test solutions Industry leader in handset performance testing Flexible network emulator platforms

19. Analyze Assure Accelerate TM SR3420 WCDMA Network Emulator SR3420 is our new WCDMA network emulator platform designed specifically for HSDPA High fidelity RF (based on SR5500)  Covers all operating bands Rich roadmap of field upgradeable features  14 Mbps (Category 10)  HSUPA (Release 6)

20. Analyze Assure Accelerate TM Moving to HSDPA SR3410SR3420 Phase 1 Up to six R99 cellsOne HSDPA cell One HSDPA cell + five additional R99 cells Phase 2 (2Q06) SR3420

21. Analyze Assure Accelerate TM Air Access for HSDPA AirAccess provides a single common interface to SR3410 (R99) and SR3420 (HSDPA)  Build upon familiar and flexible GUI  Seamless addition of HSDPA functionality SR3410 SR3420 ETH Hub

22. Analyze Assure Accelerate TM Air Access for HSDPA HS-DSCH programmability  Transport block size  Number of HS-PDSCH codes

23. Analyze Assure Accelerate TM Air Access for HSDPA HSDPA Code Settings

24. Analyze Assure Accelerate TM Air Access for HSDPA MAC-hs configuration  CQI override  Scheduler selection (future)  Multi-user traffic simulation (future)

25. Analyze Assure Accelerate TM Air Access for HSDPA MAC-hs statistics

26. Analyze Assure Accelerate TM Air Access HSDPA Roadmap Release 1  Single cell support for 3.6 Mbps (Categories 1-6, 11, 12)  Test Themes: Functional verification, throughput testing HS-DSCH and HS-SCCH programmability Transport block, inter-TTI distance, HARQ configurability MAC-hs and CQI statistics  Interactive mode Section 9 testing (and beyond!) Full support for Fixed Reference Channels  Automated Section 9 testing to follow in December ’05 (U-ATS)

27. Analyze Assure Accelerate TM Air Access HSDPA Roadmap Release 2 - January 2006  Adds multi-RAB configurations  Test Themes: R99 coexistence, L2 test, Adversarial, Dynamic Environment Release 3 - April 2006  Adds multi-cell R99  Supports 7.2 Mbps (Category 8)  Test Themes: Mobility testing, Application testing, Energy management

28. Analyze Assure Accelerate TM Summary HSDPA is fundamentally different from R99  Unique set of test requirements Conformance covers only 10-20% of an HSDPA test plan  Air Access for HSDPA is also designed to address the rest Functionality constructed around key test themes  Functional verification, throughput, mobility, adversarial, … Release 2 - January 2006 Release 3 - April 2006

29. Analyze Assure Accelerate TM All trademarks mentioned herein are the property of their respective owners Copyright © 2004 Spirent Communications Inc. Analyse |Assure |Accelerate ™