Point to Point Point to Multipoint Broadband Application

Point to Point & Point to Multipoint Broadband Application Enablers February 20, 2001 Mike Fink SVP – Architecture & Advanced Technology

Network Deployment Tradeoffs • • • Spectrum Capacity Real Estate: Indoor, Rooftop, IFL Range Ease of Use Cost Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 2

Win. Star 38 GHz Spectrum Holdings Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 3

28 GHz Spectrum • • New York San Francisco San Jose Salt Lake City New Orleans Orlando Greensboro Norfolk Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 4

PTP Spectrum Usage Up Link 700 MHz Down Link 50 MHz 8 x. T 1 20 40 12. 5 50 28 2 x 50 MHz Point to Point&Point to Multipoing Spectrum and Resource Management Issues 20 DS 3 Narrowband DS 3 40 Today 12. 5 OC 3 Ver 1 OC 3 Ver 2 OC 12 Ver 1 Winstar Proprietary & Confidential FCC Channel 50 28 2 x 50 MHz Emerging page 5

PTP and PMP Usage, Spectrum, and Antennas Bandwidth Size Technology 20 8 x. T 1 1 DS 3 1 Narrowband DS 3 1 PTP 40 12. 5 50 PMP 28 10 10 10 12. 5 # Antennas OC 3 Ver 1 1 25 MB 45 MB 180 MB 155 MB OC 3 Ver 2 1 155 MB 5 x 40 Mbps 2 200 MB 4 x 45 Mbps (DS-3’s) 4 180 MB 12. 5 Point to Point&Point to Multipoing Spectrum and Resource Management Issues 12. 5 Capacity/FCC Winstar Proprietary & Confidential page 6

Siemens PMP Frequency Usage 700 MHz T-R Spacing 50 MHz Upstream Channel F 1 F 2 F 3 F 4 F 5 Siemens • 5 x 1 -10 MHz Sub-Channels • FDMA or TDMA • Payload to 40 Mb/Sub-Channel Point to Point&Point to Multipoing Spectrum and Resource Management Issues 50 MHz Downstream Channel F 1 F 2 F 3 F 4 F 5 • 5 x 1 -10 MHz Sub-Channels • QPSK, 16 QAM or 64 QAM • Payload to 40 Mb/Sub-Channel Winstar Proprietary & Confidential page 7

PMP/PTP Coverage/Capacity and Comparisons . 86 Miles 13. 3 Mbs F 2 F 1 F 1 F 2 . 52 Miles 45 Mbs PTP 1. 16 Miles Point to Point&Point to Multipoing Spectrum and Resource Management Issues . 67 Miles 27 Mbs Winstar Proprietary & Confidential page 8

Range Variation from Antenna Selection PMP & PTP 90 sector . 5. 57. 63 . 86. 93 1. 0 45 MB 13 MB 8 T 1 PTP 22. 5 sector DS 3 PTP OC 3 PTP 45 sector 1. 13 1. 16 1. 33 Distance Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 9

Comparison of Antenna Usage at Hub PMP vs. PTP # Antennas 20 PTP 7 PMP 2 1 4 8 11 15 18 20 # Buildings Added in Sector Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 10

PTP vs PMP Over. Subscription 25 MHz 75 MHz Point to Point&Point to Multipoing Spectrum and Resource Management Issues 2+1 Redundant Oversubscribed PMP Sectors 6+1 Redundant 15 Point to Point Links Fixed Bandwidth 600 MHz PMP Sectors Winstar Proprietary & Confidential page 11

PTP vs PMP Over. Subscription 1 Oversubscribed Redundant PMP Sectors 20 MHz 15 PTP Links 70 MHz Point to Point&Point to Multipoing Spectrum and Resource Management Issues 2 Fixed Bandwidth 600 MHz Redundant PMP Sectors Winstar Proprietary & Confidential page 12

TDM / ATM Architecture Comparison B-Site HUB PTP/PMP M 1/3 ATM A/C DLC M 1/3 Backhaul TDM Point to Point&Point to Multipoing Spectrum and Resource Management Issues ATM Winstar Proprietary & Confidential page 13

Point-to-Point Radio • • Relatively Easy to Deploy Burns Resources Used or Not Spectrally Efficient Higher Capacity Potential (New High Capacity Products on the Way – OC 6/OC 12) • Real Estate Burdensome • Reasonably Cost Effective Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 14

Point-to-Multi-Point • • High Initial Costs Require Strong Demand Very Real Estate Efficient Spectrum Efficient Excellent Product to Reduce Current Hub Congestion Issues • Limited Range vs PTP • Requires Traffic Management Capability Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 15

Applications We’re Offering Using Our PMP/ATM Infrastructure… • Toll quality voice – Local & Long Distance Ø Utilizing ATM QOS • • High Speed Internet / Broadband Access Business Essentials / Office. Com Frame Relay Private Line / MAN’s Native ATM IP VPN’s Burstable Bandwidth On Demand Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 16

How it all comes together… Point to Point&Point to Multipoing Spectrum and Resource Management Issues Winstar Proprietary & Confidential page 17