Huawei Technologies W-CDMA 2100MHz RRU 3801C 20W. June 2012

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1 DesigN Analysis - Infrastructure Earl J. Lum elum@ejlwireless.com Huawei Technologies W-CDMA 2100MHz RRU 3801C 20W June 2012 Entire contents. Reproduction of this publication in any form without prior written permission is strictly forbidden and will be prosecuted to the fully extent of US and International laws. The transfer of this publication in either paper or electronic form to unlicensed third parties is strictly forbidden. The information contained herein has been obtained from sources EJL Wireless Research LLC deems reliable. EJL Wireless Research disclaims all warranties as to the accuracy, completeness or adequacy of such information. EJL Wireless Research LLC shall have no liability for errors, omissions or inadequacies in the information contained herein or for the interpretation thereof. The reader assumes sole responsibility for the selection of these materials to achieve its intended results. The opinions expressed herein are subject to change without notice.

2 TABLE OF CONTENTS EXECUTIVE SUMMARY... 6 Active/Passive Component Summary... 6 Important Note:... 6 CHAPTER 1: HUAWEI DBS3800 UMTS W-CDMA BBU/RRU SYSTEM Overview of DBS3800 Platform... 7 CHAPTER 2: MECHANICAL ANALYSIS... 9 Mechanical Analysis... 9 CHAPTER 3: TRX SUBSYSTEM Digital Processor and TRx PCB...18 Main Power Distribution/Control Panel...21 TRx RF Shield...27 Area A1: RRU Baseband Signal Processing/Error Correction...29 Area A2: Transport Interface/Baseband Signal Processing...31 Area B: RRU Diversity Receiver...34 Area C: TX Feedback Loop, RF Transmitter and RRU Timing...37 Area D1: Baseband Signal Processing Support...40 Area D2: Transport Interface Support...42 CHAPTER 4: RRU RF AMPLIFIER SUBSYSTEM CHAPTER 5: RRU DUPLEXER CAVITY FILTER RF SUBSYSTEM CHAPTER 6: RF LNA CHAPTER 7: RRU POWER SUPPLY APPENDIX A - PASSIVE CASE SIZE ANALYSIS APPENDIX B - ACTIVE COMPONENT MARKET SHARE ANALYSIS

3 TABLES Table 1: RRU RF/Digital Cable Listing Table 2: Power Distribution Circuit, Top Bill of Materials Table 3: Power Distribution Circuit, Bottom Bill of Materials Table 4: Area A1 Bill of Materials Table 5: Area A2 Bill of Materials Table 6: Area B Bill of Materials Table 7: Area C Bill of Materials Table 8: Area D1 Bill of Materials Table 9: Area D2 Bill of Materials Table 10: RRU RF Power Amplifier Bill of Materials Table 11: LNA Module Top Bill of Materials...65 Table 12: LNA Module Bottom Bill of Materials Table 13: Passive Component Case Size Distribution by System Subsection Table 14: Identified Passive Component Supplier Distribution by System Subsection Table 15: Active/Passive Component Distribution by System Subsection Table 16: Active Semiconductor/Component Vendor Distribution by System Subsection

4 EXHIBITS Exhibit 1: Huawei BBU Exhibit 2: Huawei DBS3800 BBU/RRU 3 Sector Site Example...8 Exhibit 3: Huawei RRU3801C System Block Diagram...8 Exhibit 4: RRU Sun Shield External and Internal View...9 Exhibit 5: RRU with Sun Shield Exhibit 6: RRU Front View Exhibit 7: RRU Rear View Exhibit 8: RRU Side View, Left Exhibit 9: RRU Side View, Right Exhibit 10: RRU Top View Exhibit 11: RRU Bottom View Exhibit 12: RRU Internal View Exhibit 13: RRU Housing, Internal View, TRx Side Exhibit 14: RUS Housing, Internal View, Power Amplifier/Duplexer Filter Side Exhibit 15: RRU RF/Digital Cable Schematic Exhibit 16: RRU TRx PCB, Top View Exhibit 17: RRU TRx PCB, Bottom View Exhibit 18: RRU CPRI Interface/Control Panel Exhibit 19: Power Distribution Component Diagram, Top Exhibit 20: Power Distribution Component Diagram, Bottom Exhibit 21: TRx RF Shield External View Exhibit 22: TRx RF Shield Internal View Exhibit 23: Area A1 Component Diagram Exhibit 24: Area A2 Component Diagram Exhibit 25: Area B Component Diagram Exhibit 26: Area B Block Diagram Exhibit 27: Area C Component Diagram Exhibit 28: Area C Block Diagram Exhibit 29: Area D1 Component Diagram Exhibit 30: Area D2 Component Diagram Exhibit 31: RRU RF Amplifier Subsystem Exhibit 32: RF Power Amplifier RF Ports Location Diagram Exhibit 33: RRU RF Power Amplifier Mounting Diagram Exhibit 34: RRU RF Power Amplifier Heat Sink Exhibit 35: RF Power Amplifier RF Shield, External View Exhibit 36: RF Power Amplifier RF Shield, Internal View Exhibit 37: RF Power Amplifier Heat Sink, Side and End Views Exhibit 38: RRU RF Power Amplifier Tx Path Block Diagram Exhibit 39: RRU RF Power Amplifier Component Diagram Exhibit 40: RRU Duplexer Filter, Top View...51 Exhibit 41: RRU Duplexer Filter, Bottom View Exhibit 42: RRU Duplexer Filter, Side View...52 Exhibit 43: RRU Duplexer Filter RF Shield, Top View Exhibit 44: RRU Duplexer Filter RF Shield, Bottom View Exhibit 45: Duplexer Filter 7/16 DIN Connectors Exhibit 46: RRU Duplexer Filter Tx/Rx Paths Exhibit 47: Duplexer Filter Waveguide Coupler Elements Exhibit 48: ANT_TXRXA Connector Housing Exhibit 49: ANT_TXRXA Connector Monitoring Circuit Exhibit 50: RRU LNA Exhibit 51: LNA End View with RF Shield...57 Exhibit 52: LNA with RF Shield Removed, Top View Exhibit 53: LNA with RF Shield Removed, End View Exhibit 54: LNA SMA-SMA Semi Rigid Coaxial Cables Exhibit 55: LNA Module Supports Exhibit 56: LNA Module, Opened Exhibit 57: LNA Module Housing, Internal View, Top and Bottom Exhibit 58: LNA Module Housing, External View, Top and Bottom Exhibit 59: LNA Module Dimensions and RF Connector Identification, Top View Exhibit 60: LNA Module Dimensions and RF Connector Identification, Bottom View

5 Exhibit 61: LNA Module Component Diagram, Top View of PCB Exhibit 62: LNA Module Component Diagram, Bottom View of PCB Exhibit 63: LNA Module Circuit Diagram...64 Exhibit 64: RRU AC Power Connector...66 Exhibit 65: RRU AC Power Connector Port Location Exhibit 66: RRU Power Supply Identification Label Exhibit 67: RRU Power Supply Dimensions Exhibit 68: RRU Power Supply Location on Chassis Exhibit 69: Internal View of Power Supply...68 Exhibit 70: Passive Component Case Size Distribution Exhibit 71: Identified Passive Component Market Share by Vendor Exhibit 72: Active Semiconductor Component Share Exhibit 73: High Pin Count IC vs. Discretes...75 Exhibit 74: Active Semiconductor Market Share by Vendor Exhibit 75: High Pin Count (64+) Active Semiconductor Market Share by Vendor