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RF Measurements
133
Chapter 7
RF Measurements
This chapter provides the procedures for measuring the downstream and upstream RF
signals of a DOCSIS Module using a spectrum analyzer. You can follow these procedures
immediately after the initial installation and configuration of the G10 CMTS to ensure the
system is configured and operating properly. In addition, these procedures can assist you
with the diagnosis of RF issues that are detected by spectrum monitoring applications such
as the ServiceGuard Management System (see “ServiceGuard Management System” on
page 147).
The procedures assume the use of a Hewlett Packard HP8591C CATV Analyzer, but any
equivalent spectrum analyzer will suffice.
This chapter discusses the following topics:
! Downstream RF Measurement in CATV Mode on page 134
! Downstream RF Measurement in Spectrum Analyzer Mode on page 135
! Upstream RF Measurement on page 137
- G10 CMTS 1
- Release 3.0 1
- Table of Contents 3
- Chapter 3 4
- Chapter 4 5
- List of Figures 9
- List of Tables 11
- About This Manual 13
- Audience 14
- Document Organization 14
- Related Documents 14
- Documentation Conventions 15
- Notes, Cautions, and Warnings 15
- Contact Juniper Networks 16
- Documentation Feedback 16
- Product Overview 17
- Chapter 1 19
- Head End 21
- Functional Overview 23
- G10 CMTS Components 24
- G10 CMTS Management 26
- G10 CMTS Hardware Overview 26
- System Overview 27
- Management 30
- Chapter 2 35
- Physical Characteristics 36
- Card Cage and Midplane 37
- Connector Function 38
- Front View 39
- Rear View 39
- Chassis Versions 41
- Power Supplies 42
- Hardware Component Overview 43
- Input Range 43
- 100-240V 43
- 200W Hot Swap 43
- Power Transition Modules 44
- Cooling and Fans 45
- DOCSIS Module 45
- Hot Swap 46
- Functional Characteristics 47
- Data Packet Processing 48
- Higher Layer Functions 49
- MAC Layer Functions 50
- Physical Layer Functions 50
- Modem Management 51
- MAC Layer Scheduling 51
- Cable Modem Management 51
- Dimension Value 52
- LED Label Color Function 52
- Chassis Control Module 53
- Specification Value 57
- Connector Label Function 57
- Switch Label Function 57
- NIC Module 58
- CLK PWR RTM OK 59
- LED Color Function 63
- Chassis Rear Modules 64
- NIC Access Module 64
- HFC Connector Module 66
- Switched I/O Module 69
- LED Function 70
- Hard Disk Module 71
- Routing Protocol Process 74
- Routing Protocols 74
- Routing and Forwarding Tables 75
- Routing Policy 75
- Interface Process 76
- SNMP and MIB II Processes 76
- Management Process 76
- Routing Engine Kernel 76
- Software Monitoring Tools 77
- Data Path Processing 78
- Downstream Data Path 78
- Upstream Data Path 79
- Initial Installation 81
- Safety Precautions 84
- Environment 88
- Mounting 89
- Coaxial Cable Requirements 91
- Summary Checklist 98
- Noise Measurement Methodology 99
- Setting Value 100
- Prepare the Site 101
- Parameter Value 102
- Chapter 5 109
- Ground the Chassis 110
- Rack Mounting 110
- Install the CMTS 111
- 17.3 in (439.4 mm) 113
- 18.6 in (472.6 mm) 113
- Install Power Supplies 117
- Install a DOCSIS Module 119
- Install a Hard Disk Module 124
- Install a NIC Module 124
- Install a NIC Access Module 124
- Cable the F-connector Ports 125
- Cable a NIC Module 129
- Cable a NIC Access Module 131
- Connect to Power Sources 135
- AC Power 135
- Power Cord 136
- Retainer Clip 136
- DC Power 137
- Chapter 6 139
- LED Status Meaning 141
- Power On and Configure the PC 143
- Chapter 7 149
- RF Measurements 151
- Upstream RF Measurement 153
- Chapter 8 157
- Flap List 158
- ! Amplifier thermal noise 159
- ! Fiberoptic link noise 159
- ! Ingress noise 159
- ! Stability 160
- Local Event Log 161
- Operational Commands 162
- Troubleshooting 163
- CMTS Power and Booting Issues 164
- CMTS Is Not Powering Up 164
- CMTS Powers Down 165
- Cable Modem is Dropped 172
- HFC Plant Related Issues 172
- Chapter 9 175
- Remove Power Supplies 176
- Replacement Procedures 177
- Fan Trays 178
- Replace a Fan Tray 178
- Front Fan Trays 179
- Rear Fan Tray 179
- Module Removal 182
- Remove a DOCSIS Module 182
- Remove a Hard Disk Module 186
- Remove a NIC Module 186
- Remove a NIC Access Module 186
- Appendixes 187
- Appendix A 189
- Immunity 190
- Appendix B 191
- Nominal Symbol Rate 194
- (Msym/sec) 194
- Nominal Channel Spacing 194
- (kHz) Bit Rate (bps) 194
- Appendix C 197
- Channel STD IRC HRC 198
- Numerics 205
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