Juniper Networks G10 CMTS User Manual
G10 CMTS
Hardware Guide
Release 3.0
Juniper Networks, Inc.
1194 North Mathilda Avenue
Sunnyvale, CA 94089
USA
408-745-2000
www.juniper.net
Part Number: 530-009111-01, Revision 1
This product includes the Envoy SNMP Engine, developed by Epilogue Technology, an Integrated Systems Company. Copyright © 1986–1997, Epilogue
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Technology Corporation. All rights reserved. This program and its documentation were developed at private expense, and no part of them is in the public
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domain.
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This product includes memory allocation software developed by Mark Moraes, copyright © 1988, 1989, 1993, University of Toronto.
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This product includes FreeBSD software developed by the University of California, Berkeley, and its contributors. All of the documentation and software
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included in the 4.4BSD and 4.4BSD-Lite Releases is copyrighted by The Regents of the University of California. Copyright © 1979, 1980, 1983, 1986, 1988,
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1989, 1991, 1992, 1993, 1994. The Regents of the University of California. All rights reserved.
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GateD software copyright © 1995, The Regents of the University. All rights reserved. Gate Daemon was originated and developed through release 3.0 by
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Cornell University and its collaborators. Gated is based on Kirton’s EGP, UC Berkeley’s routing daemon (routed), and DCN’s HELLO routing protocol.
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Development of Gated has been supported in part by the National Science Foundation. Portions of the GateD software copyright © 1988, Regents of the
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University of California. All rights reserved. Portions of the GateD software copyright © 1991, D. L. S. Associates.
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This product includes software developed by Maker Communications, Inc., Copyright © 1996, 1997, Maker Communications, Inc.
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Juniper Networks is registered in the U.S. Patent and Trademark Office and in other countries as a trademark of Juniper Networks, Inc. Broadband Cable
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Processor, ERX, ESP, G10, Internet Processor, JUNOS, JUNOScript, M5, M10, M20, M40, M40e, M160, MRX, M-series, NMC-RX, SDX, ServiceGuard, T320,
T640, T-series, UMC, and Unison are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service
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marks are the property of their respective owners. All specifications are subject to change without notice.
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G10 CMTS Hardware Guide
Copyright © 2003, Juniper Networks, Inc.
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All rights reserved. Printed in USA.
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Writer: Jerry Isaac
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Editor: Stella Hackell
Illustrations: Paul Gilman
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Covers and template design: Edmonds Design
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Revision History
14 May 2003—First Edition.
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The information in this document is current as of the date listed in the revision history.
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Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer or
otherwise revise this publication without notice.
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Products made or sold by Juniper Networks (including the M5, M10, M20, M40, M40e, and M160 routers, T320 router, T640 routing node, and the JUNOS
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software) or components thereof might be covered by one or more of the following patents that are owned by or licensed to Juniper Networks: U.S. Patent
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Nos. 5,473,599, 5,905,725, 5,909,440, 6,333,650, 6,359,479, and 6,406,312.
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YEAR 2000 NOTICE
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Juniper Networks hardware and software products are Year 2000 compliant. The JUNOS software has no known time-related limitations through the year
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2038. However, the NTP application is known to have some difficulty in the year 2036.
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SOFTWARE LICENSE
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The terms and conditions for using this software are described in the software license contained in the acknowledgment to your purchase order or, to the
extent applicable, to any reseller agreement or end-user purchase agreement executed between you and Juniper Networks. By using this software, you
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indicate that you understand and agree to be bound by those terms and conditions.
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Generally speaking, the software license restricts the manner in which you are permitted to use the software and may contain prohibitions against certain
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uses. The software license may state conditions under which the license is automatically terminated. You should consult the license for further details.
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For complete product documentation, please see the Juniper Networks Web site at www.juniper.net/techpubs.
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The Chassis Control Module and its corresponding JUNOSg software perform encryption that is subject to U.S. Customs and Export regulations and shall not
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be exported, sold or transferred to a country outside the USA and Canada without an appropriate export license from the U.S. Government. The specific
Regulations governing exports of encryption products are set forth in the Export Administration Regulations, 15 C.F.R. (Code of Federal Regulations), Parts
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730-774.
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ii
Table of Contents
About This Manual
Objectives............................................................................................................xiii
Audience.............................................................................................................. xiv
Document Organization....................................................................................... xiv
Related Documents.............................................................................................. xiv
Documentation Conventions ................................................................................ xv
Notes, Cautions, and Warnings...................................................................... xv
Contact Juniper Networks .................................................................................... xvi
Documentation Feedback....................................................................................xvi
Part 1
Product Overview
Chapter 1
Chapter 2
System Overview .....................................................................................................3
System Description.................................................................................................3
Field-Replaceable Units (FRUs)................................................................................6
G10 CMTS Features and Functions .........................................................................7
Functional Overview........................................................................................7
Broadband Cable Processor ASIC.....................................................................7
G10 CMTS Components..........................................................................................8
G10 CMTS Management .......................................................................................10
G10 CMTS Hardware Overview.............................................................................10
Hardware Component Overview ...................................................................19
Chassis..................................................................................................................19
Physical Characteristics .................................................................................20
Card Cage and Midplane................................................................................21
Chassis Versions............................................................................................25
Power Supplies ..............................................................................................26
Power Transition Modules .............................................................................28
Cooling and Fans...........................................................................................29
DOCSIS Module ....................................................................................................29
Functional Characteristics..............................................................................31
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Ta b l e o f C o n te nt s
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Chapter 3
System Architecture Overview ..................................................................... 57
Chassis Control Module ........................................................................................37
NIC Module...........................................................................................................42
Chassis Rear Modules...........................................................................................48
JUNOSg Internet Software Overview.....................................................................57
Data Path Processing............................................................................................62
Data Packet Processing ..........................................................................32
Higher Layer Functions...................................................................33
MAC Layer Functions......................................................................34
Physical Layer Functions.................................................................34
Modem Management .............................................................................35
MAC Layer Scheduling ....................................................................35
Cable Modem Management ............................................................35
Enhanced Routing and Bridging Features............................................... 35
Physical and Electrical Characteristics ...........................................................36
Functional Characteristics..............................................................................38
Configuration, State, and Alarm Data..................................................... 40
Physical and Electrical Characteristics ...........................................................40
Functional Characteristics..............................................................................44
Physical and Electrical Characteristics ...........................................................44
NIC Access Module........................................................................................ 48
HFC Connector Module .................................................................................50
Switched I/O Module .....................................................................................53
Hard Disk Module..........................................................................................55
Routing Engine Software Components .......................................................... 58
Routing Protocol Process........................................................................58
Routing Protocols............................................................................58
Routing and Forwarding Tables ...................................................... 59
Routing Policy ................................................................................59
Interface Process.................................................................................... 60
SNMP and MIB II Processes.................................................................... 60
Management Process .............................................................................60
Routing Engine Kernel ...........................................................................60
Tools for Accessing and Controlling the Software..........................................61
Software Monitoring Tools............................................................................. 61
Software Installation and Upgrade Procedures .............................................. 61
Downstream Data Path ................................................................................. 62
Upstream Data Path ......................................................................................63
JUNOSg 3.0 G10 CMTS Hardware Guide
iv
Part 2
Initial Installation
Chapter 4
Chapter 5
Prepare the Site .....................................................................................................67
Safety Precautions ................................................................................................68
Notices..................................................................................................................70
Power ...................................................................................................................71
AC Power.......................................................................................................71
DC Power ......................................................................................................72
Environment.........................................................................................................72
Mounting ..............................................................................................................73
Tools and Equipment Required for Installation .....................................................74
Coaxial Cable Requirements .................................................................................75
Characterization of Installation Site.......................................................................75
Summary Checklist...............................................................................................82
Noise Measurement Methodology.........................................................................83
Average Upstream Noise Measurement .........................................................83
Peak Upstream Noise Measurement ..............................................................84
Additional Characterization Tables........................................................................85
Verification of Shipping Cartons............................................................................89
G10 CMTS Installation Checklist............................................................................90
Install the CMTS......................................................................................................93
Ground the Chassis...............................................................................................94
Rack Mounting......................................................................................................94
Install Power Supplies.........................................................................................101
Install a DOCSIS Module .....................................................................................103
Install an HFC Connector Module or SIM ............................................................105
Install a Chassis Control Module .........................................................................108
Install a Hard Disk Module..................................................................................108
Install a NIC Module............................................................................................108
Install a NIC Access Module ................................................................................108
Cable an HFC Connector Module or SIM .............................................................109
Cable the F-connector Ports.........................................................................109
Cable a Chassis Control Module ..........................................................................113
Cable a NIC Module ............................................................................................113
Cable a NIC Access Module.................................................................................115
Attach a PC to the Chassis Control Module..........................................................119
Connect to Power Sources ..................................................................................119
AC Power.....................................................................................................119
DC Power ....................................................................................................121
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Ta b l e o f C o n te nt s
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Part 3
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Troubleshooting and Maintenance
Chapter 6
Chapter 7
Chapter 8
Connect the Power and Perform Initial Configuration................123
Power On the G10 CMTS....................................................................................123
Power On and Configure the PC .........................................................................127
Perform Initial Software Configuration ..............................................................128
RF Measurements................................................................................................133
Downstream RF Measurement in CATV Mode.................................................... 134
Downstream RF Measurement in Spectrum Analyzer Mode ...............................135
Upstream RF Measurement ................................................................................ 137
Troubleshooting .................................................................................................... 141
Features for Troubleshooting ..............................................................................141
CMTS Power and Booting Issues.........................................................................148
Ideal HFC Plant Configuration Issues ..................................................................150
HFC Plant Related Issues ....................................................................................156
Flap List.......................................................................................................142
Use the Flap List for Troubleshooting ...................................................142
Local Event Log ...........................................................................................145
Operational Commands .............................................................................. 146
ServiceGuard Management System .............................................................147
CMTS Is Not Powering Up ...........................................................................148
CMTS Does Not Boot Successfully................................................................148
CMTS Powers Down....................................................................................149
Cable Modem Cannot Successfully Range....................................................150
Cable Modem Cannot Establish IP Connectivity ..........................................151
Cable Modem Cannot Successfully Register.................................................151
Cable Modem Throughput is Slow............................................................... 152
Cable Modem is Dropped............................................................................156
Cable Modem Cannot Successfully Range....................................................157
Cable Modem Throughput is Slow ...............................................................158
JUNOSg 3.0 G10 CMTS Hardware Guide
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Part 4
Appendixes
Part 5
Index
Chapter 9
Appendix A
Appendix B
Appendix C
Index
Replacement Procedures ...............................................................................159
Power Supplies ...................................................................................................159
Fan Trays............................................................................................................162
Module Removal.................................................................................................166
Agency Certifications........................................................................................173
Safety .................................................................................................................173
EMC....................................................................................................................174
Immunity............................................................................................................174
Radio Frequency (RF) Specifications .....................................................175
EIA Channel Plans................................................................................................181
Index.............................................................................................................................189
Remove Power Supplies ..............................................................................160
Replace a Fan Tray......................................................................................162
Front Fan Trays....................................................................................163
Rear Fan Tray.......................................................................................163
Remove a DOCSIS Module...........................................................................166
Remove an HFC Connector Module or SIM..................................................168
Remove a Chassis Control Module...............................................................169
Remove a Hard Disk Module .......................................................................170
Remove a NIC Module.................................................................................170
Remove a NIC Access Module......................................................................170
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Ta b l e o f C o n te nt s
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JUNOSg 3.0 G10 CMTS Hardware Guide
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List of Figures
List of Figures
Figure 1: Typical CMTS Location..........................................................................4
Figure 2: Headend Architecture ..........................................................................5
Figure 3: G10 CMTS Components and Interfaces.................................................9
Figure 4: Front View of Fully Configured Chassis...............................................11
Figure 5: Front View of Partially Configured Chassis..........................................12
Figure 6: Rear View of Fully Configured Chassis ................................................13
Figure 7: Rear View of Partially Configured Chassis...........................................14
Figure 8: Chassis Top View Showing Midplane Slot Numbering ........................15
Figure 9: Midplane—Front and Rear Views........................................................23
Figure 10: Midplane Domains..............................................................................25
Figure 11: AC Power Supply Front Panel .............................................................27
Figure 12: DOCSIS Module Front Panel ...............................................................30
Figure 13: DOCSIS Module Block Diagram ..........................................................32
Figure 14: Packet Processing Layers....................................................................33
Figure 15: Chassis Control Module Front Panel....................................................39
Figure 16: NIC Module Front Panel......................................................................43
Figure 17: NIC Access Module Front Panel ..........................................................49
Figure 18: HFC Connector Module Rear Panel.....................................................51
Figure 19: G10 CMTS Data Flow .........................................................................52
Figure 20: SIM Rear Panel ...................................................................................54
Figure 21: Hard Disk Module Rear Panel .............................................................56
Figure 22: G10 CMTS Data Flow .........................................................................64
Figure 23: Average Upstream Noise Measurement Example................................84
Figure 24: Peak Upstream Noise Measurement Example.....................................85
Figure 25: Air Flow Through Chassis....................................................................96
Figure 26: Bottom of Chassis...............................................................................97
Figure 27: Lifting the Chassis...............................................................................98
Figure 28: Rack-Mounted Chassis........................................................................99
Figure 29: Rack Fully Populated with Three G10 CMTS Chassis.........................100
Figure 30: Power Supply Installation ................................................................102
Figure 31: Air Management Module Removal ....................................................104
Figure 32: DOCSIS Module Installation ..............................................................105
Figure 33: HFC Connector Module Installation ..................................................107
Figure 34: Example of Allocation of Multiple Interfaces Per Port .....................109
Figure 35: Rear Coaxial Cable Connections ......................................................112
Figure 36: NIC Module Cabling – Front View .....................................................114
Figure 37: NIC Access Module Cable Connections ............................................117
Figure 38: AC Power Cord and Retainer Clip .....................................................120
Figure 39: DC Power Transition Module ............................................................122
Figure 40: Downstream RF Signal (CATV Mode) ................................................135
Figure 41: Downstream RF Signal (Spectrum Analyzer Mode) ...........................136
Figure 42: Single Upstream Burst ......................................................................138
Figure 43: Multiple Upstream Bursts ..................................................................139
Figure 44: Power Supply Removal ....................................................................161
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List of Figures
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List of Figures
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Figure 45: Front Fan Tray Replacement ...........................................................164
Figure 46: Rear Fan Tray Replacement ............................................................165
Figure 47: DOCSIS Module Removal .................................................................167
Figure 48: HFC Connector Module Removal .....................................................169
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JUNOSg 3.0 G10 CMTS Hardware Guide
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List of Tables
List of Tables
Table 1: Chassis Physical Specifications ...........................................................20
Table 2: Chassis Environmental Specifications .................................................21
Table 3: Card Cage and Midplane Specifications ..............................................21
Table 4: Midplane P1 – P5 Connectors.............................................................22
Table 5: Midplane Configuration ......................................................................24
Table 6: Power Supply LEDs.............................................................................26
Table 7: Power Supply Specifications ..............................................................28
Table 8: DOCSIS Module Physical Dimensions .................................................36
Table 9: DOCSIS Module Operational Characteristics .......................................36
Table 10: DOCSIS Module LEDs .........................................................................36
Table 11: Chassis Control Module Physical Dimensions .....................................41
Table 12: Chassis Control Module Connectors....................................................41
Table 13: Chassis Control Module Switches........................................................41
Table 14: Chassis Control Module LEDs..............................................................41
Table 15: NIC Module Physical Dimensions........................................................44
Table 16: NIC Module Connectors ......................................................................44
Table 17: Single-Mode, Long-Range GBIC Specifications.....................................45
Table 18: Single-Mode, Midrange GBIC Specifications ........................................45
Table 19: Multimode GBIC Specifications ...........................................................46
Table 20: 1000BT GBIC Specifications................................................................46
Table 21: NIC Module LEDs................................................................................47
Table 22: NIC Access Module LEDs ....................................................................48
Table 23: HFC Connector Module Fast Ethernet LEDs ........................................50
Table 24: SIM Fast Ethernet Port LEDs ...............................................................54
Table 25: G10 CMTS Environmental Specifications ............................................72
Table 26: Coaxial Cable Requirements ...............................................................75
Table 27: RF Plant/HFC Environment Characterization ......................................76
Table 28: Existing DOCSIS Service Characterization...........................................77
Table 29: Upstream CMTS Parameter Characterization......................................78
Table 30: Downstream CMTS Parameter Characterization .................................80
Table 31: Upstream Frequency Spectrum Utilization..........................................81
Table 32: Pre-Installation Requirement Summary Checklist ...............................82
Table 33: Average Noise Spectrum Analyzer Settings.........................................83
Table 34: Peak Noise Spectrum Analyzer Setup..................................................84
Table 35: Existing DOCSIS Service Characterization...........................................86
Table 36: Upstream CMTS Parameter Characterization......................................87
Table 37: Downstream CMTS Parameter Characterization ................................89
Table 38: G10 CMTS Installation Checklist..........................................................90
Table 39: NIC Access Module Wiring Plan........................................................118
Table 40: Power Supply LEDs...........................................................................124
Table 41: DOCSIS Module LED Status...............................................................125
Table 42: Chassis Control Module LED Status...................................................126
Table 43: NIC Module LED Status.....................................................................126
Table 44: NIC Access Module LED Status..........................................................127
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List of Tables
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List of Tables
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Table 45: Flap List Association to Potential Issues ............................................143
Table 46: Local Event Log Headings Displayed.................................................145
Table 47: Downstream RF Channel Transmission Characteristics ....................176
Table 48: Upstream RF Channel Transmission Characteristics .........................177
Table 49: Downstream RF Signal Output Characteristics..................................178
Table 50: DOCSIS Downstream Channel Rates and Spacing ............................178
Table 51: DOCSIS Maximum Upstream Channel Rates and Widths..................179
Table 52: EIA Channel Plan..............................................................................181
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JUNOSg 3.0 G10 CMTS Hardware Guide
xii
About This Manual
This chapter provides a high-level overview of the G10 CMTS Hardware Guide:
! Objectives on page xiii
! Audience on page xiv
! Document Organization on page xiv
! Related Documents on page xiv
! Documentation Conventions on page xv
! Contact Juniper Networks on page xvi
! Documentation Feedback on page xvi
Objectives
This manual explains the hardware installation and basic troubleshooting for the G10 CMTS
and your HFC plant. It contains procedures for preparing your site for CMTS installation,
installing the hardware, starting up the CMTS, performing initial software configuration, and
replacing field-replaceable units (FRUs). After completing the installation and basic
configuration procedures covered in this manual, refer to the JUNOSg software configuration
guides for information about further configuring the JUNOSg software.
To obtain additional information about Juniper Networks CMTSs—either corrections to
information in this manual or information that might have been omitted from this
manual—refer to the G10 CMTS hardware release notes.
To obtain the most current version of this manual, the most current version of the hardware
release notes, and other Juniper Networks technical documentation, refer to the product
documentation page on the Juniper Networks Web site, which is located at
http://www.juniper.net.
To order printed copies of this manual or to order a documentation CD-ROM, which contains
this manual, please contact your sales representative.
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About This Manual
xiii
Audience
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Audience
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Document Organization
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Related Documents
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This manual is designed for network administrators who are installing and maintaining a
G10 CMTS, or preparing a site for CMTS installation. It assumes that you have a broad
understanding of HFC networks, networking principles, and network configuration. Any
detailed discussion of these concepts is beyond the scope of this manual.
This manual is divided into several parts, each containing a category of information about
the CMTS:
! Part 1, “Product Overview,” provides an overview of the CMTS, describing its hardware
components, the JUNOSg software, and the system architecture.
! Part 2, “Initial Installation,” describes how to prepare and characterize your site for
installing the CMTS, providing environmental and power supply specifications, rack and
clearance requirements, and wiring and cabling guidelines. It also provides an overview
of the installation process and lists safety precautions. Finally, it explains how to install
the CMTS chassis and components and how to initially start the CMTS and configure the
software.
! Part 3, “Troubleshooting and Maintenance,” describes general troubleshooting
procedures for the CMTS, cable modem operation, and the HFC plant, and explains how
to track the source of problems. It also provides replacement procedures for some of the
field-replaceable units.
! Part 4, “Appendixes,” provides an appendix listing agency certifications, an appendix of
DOCSIS radio frequency (RF) specifications, and an appendix listing various channel
plans.
! Part 5, “Index,” provides an index of the manual.
For information about configuring the software, including examples, see the following
documents:
! JUNOSg Software Configuration Guide: Getting Started and System Management
! JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and Routing
Protocols
! JUNOSg Software Operational Mode Command Reference
JUNOSg 3.0 G10 CMTS Hardware Guide
xiv
Documentation Conventions
Documentation Conventions
This manual uses the following text conventions:
! CMTS and CMTS component labels are shown in a sans serif font. In the following
example, ETHERNET is the label for the Ethernet management port on the CMTS:
The 10/100-Mbps Ethernet RJ-45 connector is used for out-of-band management of
the CMTS and is labeled ETHERNET.
! Statements, commands, filenames, directory names, IP addresses, and configuration
hierarchy levels are shown in a sans serif font. In the following example, stub is a
statement name and [edit protocols ospf area area-id] is a configuration hierarchy level:
To configure a stub area, include the stub statement at the [edit protocols ospf area
area-id] hierarchy level.
! In examples, text that you type literally is shown in bold. In the following example, you
type the words show chassis hardware:
For example, you can use the following command to get information about the
source of an alarm condition:
user@host> show chassis hardware
Notes, Cautions, and Warnings
Notes, cautions, and warnings are denoted by the following symbols:
A note indicates information that might be helpful in a
particular situation or that might otherwise be overlooked.
A caution indicates a situation that requires careful
attention. Failure to observe a cautionary note could result
in minor injury or discomfort to yourself, or serious
damage to the CMTS.
A warning indicates a potentially dangerous situation.
Failure to follow the guidelines in a warning could result in
severe injury or death.
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About This Manual
xv
Contact Juniper Networks
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Contact Juniper Networks
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Documentation Feedback
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For technical support, contact Juniper Networks at support@juniper.net, or at 1-888-314-JTAC
(within the United States) or (+1) 408-745-9500 (from outside the United States).
We are always interested in hearing from our customers. Please let us know what you like
and do not like about the product documentation, and let us know of any suggestions you
have for improving the documentation. Also, let us know if you find any mistakes in the
documentation. Send your feedback and comments to techpubs-comments@juniper.net.
JUNOSg 3.0 G10 CMTS Hardware Guide
xvi
Part 1
Product Overview
! System Overview on page 3
! Hardware Component Overview on page 19
! System Architecture Overview on page 57
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JUNOSg 3.0 G10 CMTS Hardware Guide
2
Chapter 1
System Overview
This chapter provides an overview of the G10 CMTS.
System Description
The JUNOSg software runs on the G10 cable modem termination system (CMTS) and
provides both IP routing (Layer 3) and IEEE 802.1 bridging (Layer 2), as well as software for
interface, network, cable services, and chassis management. The G10 CMTS manages
Internet voice and data. It functions as the interface between the service networks—Internet,
Public Switched Telephone Network (PSTN)—and the hybrid fiber/coax (HFC) network of
subscribers, as shown in Figure 1 on page 4. This is the “last mile” of broadband service, with
the CMTS typically located in the cable headend or distribution hub. It is targeted at the
following data and voice aggregation applications:
Figure 2 on page 5 illustrates a typical cable headend architecture.
! System Description on page 3
! Field-Replaceable Units (FRUs) on page 6
! G10 CMTS Features and Functions on page 7
! G10 CMTS Components on page 8
! G10 CMTS Management on page 10
! G10 CMTS Hardware Overview on page 10
! Large CATV hub sites—DOCSIS multiservice, residential, and commercial IP network
access over HFC networks maintained by cable television (CATV) multiple service
operators (MSOs) needing enhanced integrated data, voice, and video in large
metropolitan areas.
! Small CATV hub sites—Smaller hub sites aggregated over metropolitan fiber rings
supporting Gigabit Ethernet.
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System Overview
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System Description
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Figure 1: Typical CMTS Location
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Internet
Backbone
PSTN
Switch/
Router
Cable Headend
or
Distribution Hub
Network
Management
Video
Servers
Network Side
Interface
Subscribers
CMTS
Hybrid Fiber/Coax
Network
JUNOSg 3.0 G10 CMTS Hardware Guide
4
System Description
b
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Figure 2: Headend Architecture
Broadcast Channels:
Satellite, Fiber,
Cable,
Others
PSTN
Backbone
Network
Remote
Server
Facility
ATM
Telephony
Video
Upconverter
Upconverter
Upconverter
Remote
Dial-Up
Access
Server
Backbone
Transport
Adapter,
Switch,
LAN, or
Hub
Local
Server
Facility
Interactive
Cable
Gateway
Data
Analog
Video
Digital
Video
Other
Operations
System
Support
Security &
Access
Control
Network
Termination
Upconverters
CMTS
Audio / Video
Demod
High-speed
Data
Combiner
QAM
Data
Mod
Demod
Head End
54-750 MHz
Splitter
Combiner
and
Signal
Router
5-42 MHz
E/O O/E
Coax Cable
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System Overview
5
Field-Replaceable Units (FRUs)
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Field-Replaceable Units (FRUs)
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Field-replaceable units (FRUs) are CMTS components that can be replaced at the customer
site. Replacing FRUs requires minimal CMTS downtime. A FRU can be ordered as a separate
unit for replacement into the CMTS or for stocking spare parts.
Following is an alphabetical list of G10 CMTS FRUs. See “G10 CMTS Hardware Overview” on
page 10 for a description of each FRU.
! AC power supply
! AC power tra nsi tio n mo dule
! Air management module
! Air management panel
! CCM Access Module
! Chassis
! Chassis Control Module
! DOCSIS Module
! DC power supply
! DC power transition module
! Front fan tray
! GBIC module
! Hard Disk Module
! HFC Connector Module
! NIC Module
! NIC Access Module
! NIC Access Module cable
! Power supply filler panel
! Rear fan tray
! Switched I/O Module (SIM)
JUNOSg 3.0 G10 CMTS Hardware Guide
6
G10 CMTS Features and Functions
G10 CMTS Features and Functions
The G10 CMTS provides true multiservice support, including the ability to simultaneously
support DOCSIS IP services and VoIP services.
Functional Overview
The G10 CMTS is usually connected directly to a Gigabit-class core router that is part of a
multiple system operator’s (MSO) metropolitan core network. It receives network-side packet
streams originating from the Internet, Media Gateways or video servers, then processes them
into DOCSIS-compatible digital signals (MPEG) that are modulated onto an RF carrier for
transmission downstream over the HFC network to the subscribers’ cable modems.
Upstream signals consist of protocol data units (PDUs) in data bursts from the cable modems.
The G10 CMTS uses advanced scheduling algorithms to optimize the timing of these
transmissions. The packets are processed to recover the payload data, then routed, as IP
packets, to the appropriate destinations through the network-side interface.
The G10 CMTS’s high capacity of up to 32 downstream and 128 upstream interfaces and
other innovative features are provided by the Broadband Cable Processor ASIC
(application-specific integrated circuit).
Broadband Cable Processor ASIC
The Broadband Cable Processor ASIC provides all-digital processing of the return path. This,
plus advanced noise cancellation and equalization algorithms, enables modulation rates
beyond QPSK and allows traditionally problematic frequency ranges of the upstream
spectrum to be utilized. All-digital processing also accommodates full spectrum analysis by
capturing statistics of the upstream band in real time.
The Broadband Cable Processor ASIC incorporates key DOCSIS MAC (media access control)
functions such as concatenation, fragmentation, encryption, and decryption. Accelerating
these functions in hardware provides a high-performance, scalable CMTS solution that can
process thousands of simultaneous DOCSIS service flows.
Advanced timing and digital signal processing algorithms allow more efficient use of the
RF spectrum, resulting in increased channel capacity.
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System Overview
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G10 CMTS Components
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G10 CMTS Components
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The G10 CMTS chassis employs front and rear modules that connect through a midplane.
Most of the cable connections are available in the rear of the unit. Following is a list of the
primary modules of the G10 CMTS:
! NIC Module—Provides Ethernet switching functionality for upstream and downstream
traffic and for the Fast Ethernet interfaces. Houses two Gigabit Ethernet ports with
Gigabit Interface Converters (GBICs).
! NIC Access Module—Fans out the Ethernet signals to individual 10/100Base-T lines,
which route to the HFC Connector Modules or Switched I/O Modules. A version of the
chassis provides internal Ethernet wiring between the NIC Modules and the DOCSIS
Modules.
! DOCSIS Module—Performs all data path processing functions, including Layer 2 bridging
and Layer 3 forwarding. Processes IP data into DOCSIS packets. Converts and modulates
data for RF transmission. Reverses these processes for upstream data.
! HFC Connector Module—Provides cable interfaces for a DOCSIS Module. Contains the
Fast Ethernet connectors for network-side data and the F-connectors for the HFC
cabling.
! Switched I/O Module—Provides the same functions as an HFC Connector Module, but
provides four additional upstream F-connectors for the HFC cabling.
! Chassis Control Module—Provides the management interface and runs the Routing
Engine software. Controls redundant protection functions and supplies software images
to all DOCSIS Modules. Runs the Simple Network Management Protocol (SNMP) agent
and environmental monitoring.
! Hard Disk Module—Contains the system nonvolatile memory implemented as a hard
disk. This module is installed opposite the Chassis Control Module.
The G10 CMTS relays traffic between DOCSIS RF interfaces, on which the cable modems
reside, and the network-side interfaces (Fast Ethernet and Gigabit Ethernet). Figure 3 on
page 9 illustrates the relationship between the primary modules in the chassis.
Each DOCSIS Module can support up to four cable interfaces, where a cable interface (MAC
domain) contains at least one downstream interface and one upstream interface. Each NIC
Module supports two Gigabit Ethernet interfaces and four Fast Ethernet interfaces. The
Chassis Control Module provides an out-of-band Fast Ethernet management interface.
See the JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and Routing
Protocols for more information on interfaces.
JUNOSg 3.0 G10 CMTS Hardware Guide
8
G10 CMTS Components
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Figure 3: G10 CMTS Components and Interfaces
32 Cable
Interfaces
ca-0/1/0
ca-0/1/1
ca-0/1/2
ca-0/1/3
ca-0/2/0
ca-0/2/1
ca-0/2/2
Domain A
Domain B
ca-0/2/3
ca-0/3/0
ca-0/3/1
ca-0/3/2
ca-0/3/3
ca-0/4/0
ca-0/4/1
ca-0/4/2
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ca-0/10/0
ca-0/10/1
ca-0/10/2
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ca-0/12/1
ca-0/12/2
ca-0/12/3
ca-0/13/0
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ca-0/13/2
ca-0/13/3
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
DOCSIS
Module
G10 CMTS
Chassis Control
Module (Slot 6)
NIC Module &
NIC Access Module
3x Octal
Fast Ethernet
Switch Ports
2x Gigabit
Ethernet
Switch Ports
Switch
Element
NIC Module &
NIC Access Module
3x Octal
Fast Ethernet
Switch Ports
2x Gigabit
Ethernet
Switch Ports
Switch
Element
Management Por
fxp0
fx-0/5/0
fx-0/5/1
fx-0/5/2
fx-0/5/3
gx-0/5/0
gx-0/5/1
fx-0/9/0
fx-0/9/1
fx-0/9/2
fx-0/9/3
gx-0/9/0
gx-0/9/1
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System Overview
9
G10 CMTS Management
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G10 CMTS Management
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G10 CMTS Hardware Overview
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The G10 CMTS supports the following system management applications and tools:
! Command-Line Interface (CLI)—The CLI provides the most comprehensive controls and
! SNMP—The CMTS can interact with SNMPv2c and SNMPv3-based Network
! ServiceGuard Management System – This optional advanced diagnostics application
This section provides an overview of the modules and various hardware components of the
G10 CMTS and where they reside within the chassis. This overview presents material that is
specific to the installation and configuration of the G10 CMTS.
Figure 4 on page 11 illustrates a front view of a fully configured chassis. Figure 5 on page 12
illustrates a front view of a partially configured chassis in which DOCSIS Modules, a Chassis
Control Module (CCM), a Network Interface Card (NIC) Module, power supplies, air
management modules, and power supply filler panels have been removed. Figure 6 on
page 13 illustrates a rear view of a fully configured chassis that uses the AC power transition
module and HFC Connector Modules (see Figure 39 on page 122 for an illustration of the DC
power transition module). Figure 7 on page 14 illustrates the rear view of the partially
configured chassis in which HFC Connector Modules, a Hard Disk Module, a NIC Access
Module, and air management panels have been removed. Figure 8 on page 15 provides a top
view of the chassis midplane showing the slot numbering and the location of each module.
is instrumental for installation, configuration, troubleshooting, and upgrade tasks.
Management Systems using DOCSIS 1.0 and DOCSIS 1.1 MIBs and enterprise MIBs.
Events can conditionally be reported as system log messages or SNMP traps.
with a Java GUI provides a rendition of a spectrum analyzer for acquiring data on
upstream transmission cable performance. It incorporates an integrated Impairment
Identification tool that allows for unattended monitoring of statistics to characterize
compromised performance to a potential cause (such as impulse or burst noise, narrow
band ingress, or microreflections).
JUNOSg 3.0 G10 CMTS Hardware Guide
10
G10 CMTS Hardware Overview
Figure 4: Front View of Fully Configured Chassis
Cable
Guide
Power
Power
Power
Fa
Fa
ult
Fault
ult
Power
Supply
Power
Supply
Ejector
Rail
Module
Ejector
Rail
Air
Intake
Front Fan
Tray LED
DOCSIS
Module
ESD
Strap
Jack
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w
Po
Fault
Module
NIC
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Pow
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Fa
Eth0
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Control
Module
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System Overview
11
G10 CMTS Hardware Overview
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Figure 5: Front View of Partially Configured Chassis
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Power
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Faceplate
Power
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ESD
Strap
Jack
Power
Power
Fault
Power
Fault
Fault
Power
Power
Fault
Fault
Power
Fault
Supply
Bay
Power
Supply
Power
Supply
Filler
Panel
Power
Supply
Faceplate
Clip
JUNOSg 3.0 G10 CMTS Hardware Guide
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G10 CMTS Hardware Overview
Figure 6: Rear View of Fully Configured Chassis
Channel
S 0
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DS 3
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Eth0
Eth0
Eth1
Eth1
Air
Intake
Chassis
Ground
Nuts
HFC
Connector
Module
Cable
OPERATIONAL
POWER
DS 0
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S 1
D
S 2
D
S 3
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NIC
Access
Module
INT FAULT
2
EXT FAULT
Eth
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Tray LED
OPERATIONAL
INT FAULT
POWER
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EXT FAULT
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US 3
Eth0
Eth1
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Access
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S 0
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DS 3
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AC Power
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Module
AC Power
Receptacle
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System Overview
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G10 CMTS Hardware Overview
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Figure 7: Rear View of Partially Configured Chassis
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JUNOSg 3.0 G10 CMTS Hardware Guide
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