Page 1 G10 CMTS Hardware Guide Release 3.0 Juniper Networks, Inc. 1194 North Mathilda Avenue Sunnyvale, CA 94089 408-745-2000 www.juniper.net Part Number: 530-009111-01, Revision 1...
Page 2 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 • 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 •...
Page 3: Table Of Contents
Notes, Cautions, and Warnings...xv Contact Juniper Networks ... xvi Documentation Feedback ... xvi ...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 ...19...
Page 4 • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide 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...
Page 5 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 ...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...
Page 6 • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Power On the G10 CMTS ...123 Power On and Configure the PC ...127 Perform Initial Software Configuration ...128 ...133 Downstream RF Measurement in CATV Mode ...134 Downstream RF Measurement in Spectrum Analyzer Mode ...135 Upstream RF Measurement ...137...
Page 7 Chapter 9 Replacement Procedures Part 4 Appendixes Appendix A Agency Certifications Appendix B Radio Frequency (RF) Specifications Appendix C EIA Channel Plans Part 5 Index Index Index ...159 Power Supplies ...159 Remove Power Supplies ...160 Fan Trays...162 Replace a Fan Tray ...162 Front Fan Trays ...163 Rear Fan Tray...163 Module Removal ...166...
Page 8 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • viii JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 9 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...
Page 10 • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide 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...
Page 11 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...
Page 12 • • • • JUNOSg 3.0 G10 CMTS Hardware Guide 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...
Page 13: About This Manual
! 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).
Page 14: Audience
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 •...
Page 15: 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.
Page 16: Contact Juniper Networks
Contact Juniper Networks • Contact Juniper Networks • • 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). • • • Documentation Feedback • •...
Page 17: Product Overview
Part 1 Product Overview ! System Overview on page 3 ! Hardware Component Overview on page 19 ! System Architecture Overview on page 57 • • • • • • • • • • • • • • • • •...
Page 18 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 19: System Overview
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...
Page 20: Figure 1: Typical Cmts Location
• • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Cable Headend Distribution Hub Network Management Switch/ Router CMTS Video Servers Network Side Interface Subscribers Hybrid Fiber/Coax Network...
Page 21: Figure 2: Headend Architecture
Figure 2: Headend Architecture Broadcast Channels: Satellite, Fiber, PSTN Backbone Analog Upconverter Video Digital Upconverter Combiner Video Cable, Others Upconverter Other Remote Operations Dial-Up System Access Support Upconverters Server Security & Access Control Backbone Transport Adapter, Network Network Switch, Termination LAN, or Demod Local...
Page 22: Field-Replaceable Units (Frus)
• 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. • •...
Page 23: G10 Cmts Features And Functions
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’...
Page 24: G10 Cmts Components
G10 CMTS Components • • 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 •...
Page 25: Figure 3: G10 Cmts Components And Interfaces
Figure 3: G10 CMTS Components and Interfaces 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 ca-0/2/3 Domain A 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 ca-0/4/3 ca-0/10/0 ca-0/10/1 ca-0/10/2 ca-0/10/3 ca-0/11/0 ca-0/11/1 ca-0/11/2 ca-0/11/3 Domain B ca-0/12/0 ca-0/12/1 ca-0/12/2 ca-0/12/3...
Page 26: G10 Cmts Management
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.
Page 27: Figure 4: Front View Of Fully Configured Chassis
F a u lt E th 0 E th 0 Chassis Control Front Fan Module Tray LED Module G10 CMTS Hardware Overview P o w e F a u lt Front Fan Tray LED System Overview • • • •...
Page 28: Figure 5: Front View Of Partially Configured Chassis
Faceplate • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Power Power Power Power Power Power Fault Fault Fault Fault Fault Fault Strap Jack Power Supply Power...
Page 29: Figure 6: Rear View Of Fully Configured Chassis
E th 1 E th 1 E th 0 E th 1 Rear Fan Tray LED Access Access Module Module G10 CMTS Hardware Overview Exhaust AC Power Switch AC Power Transition Module AC Power Receptacle D S 0 D S 0...
Page 30: Figure 7: Rear View Of Partially Configured Chassis
• • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide DS 0 US 0 DS 1 US 1 DS 2 US 2 DS 3 US 3 Eth0 Eth1 DS 0 US 0...
Page 31: Figure 8: Chassis Top View Showing Midplane Slot Numbering
DOCSIS Module DOCSIS Module DOCSIS Module Midplane with logical slot numbers Slots 1 through 6 reside in domain A. Slots 7 and 9 through 13 reside in domain B. G10 CMTS Hardware Overview • • • • • • •...
Page 32 • • • • JUNOSg 3.0 G10 CMTS Hardware Guide between the network-side interface (NSI) and the hybrid fiber/coax (HFC) interface. switching functions for the network-side interface. installed in a slot. air is drawn into the chassis for cooling the installed modules and power supplies.
Page 33 ! DC power transition module—Rear module that distributes the externally supplied DC power to the midplane. ! DC power receptacle—DC power cord terminal block on DC power transition module. ! Chassis ground nuts—Location where the earth ground connection to the chassis is made. G10 CMTS Hardware Overview • • • •...
Page 34 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 35: Hardware Component Overview
! NIC Module on page 42 ! Chassis Rear Modules on page 48 Chassis This section discusses the following characteristics of the G10 CMTS chassis components: ! Physical Characteristics on page 20 ! Card Cage and Midplane on page 21...
Page 36: Physical Characteristics
Chassis • The major components of the G10 CMTS chassis are listed below and discussed in detail in • the following chapters. • ! DOCSIS Module—Up to eight modules, depending on planned customer capacity. • • ! HFC Connector Module—Up to eight modules, one for each DOCSIS Module.
Page 37: Card Cage And Midplane
(see Figure 8 on page 15). The G10 CMTS does not use all connector columns on the midplane. The DOCSIS Modules, HFC Connector Modules, and SIMs are an 8 horizontal pitch (HP), double-wide design covering two columns.
Page 38: Table 4: Midplane P1 - P5 Connectors
• • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Function cPCI bus C bus Ethernet to/from HFC Connector Module or SIM Synchronization and reference clocks Power and ground RF signals to HFC Connector Module or SIM...
Page 39: Figure 9: Midplane-Front And Rear Views
Figure 9: Midplane—Front and Rear Views Front View Pwr Supply Domain A cPCI Bus Domain A Rear View Chassis PS10 Power Supply Connectors Pwr Supply Domain B cPCI Bus Domain B Connectors Power Distribution Connectors Connectors Hardware Component Overview • •...
Page 40: Table 5: Midplane Configuration
• • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Slot Front of Midplane DOCSIS Module DOCSIS Module DOCSIS Module DOCSIS Module NIC Module Chassis Control Module Chassis Control Module Blank NIC Module...
Page 41: Chassis Versions
Figure 10: Midplane Domains Domain A Chassis Versions There are two versions of the chassis—version 1 and version 2. Version 2 provides all the functions provided by version 1, but contains a new midplane that provides the following features: ! Support for eight RF upstream ports from a SIM to its corresponding DOCSIS Module. ! Ethernet wiring between DOCSIS Modules and NIC Modules that eliminates the need for external NIC Access Module cables.
Page 42: Power Supplies
Power supplies are available in either AC or DC input voltage models. You must specify a • model when ordering a G10 CMTS. The power supplies and the chassis are mechanically • keyed to ensure that the same types are used together.
Page 43: Figure 11: Ac Power Supply Front Panel
Figure 11: AC Power Supply Front Panel Input Range 100-240V 200W Hot Swap A fully populated chassis requires a nominal 1500 watts from an external power source. The components of the chassis require 1000 watts (maximum) from the power supplies. The aggregate power output from all voltage levels is 200 watts per power supply.
Page 44: Power Transition Modules
• Full power redundancy consists of redundant power supplies, power transition modules, and • power sources. All G10 CMTS systems are shipped with two power transition modules • installed, one per domain, to implement power transition module redundancy. This also •...
Page 45: Cooling And Fans
Cooling and Fans The G10 CMTS has three fan trays. The trays install into the air intake chambers in the bottom of the chassis. Two trays install from the front and one tray installs from the rear. The front trays contain six large fans each and the rear tray contains six smaller fans. The total maximum power consumption of the three fan trays is 165 watts.
Page 46: Figure 12: Docsis Module Front Panel
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Hot Swap...
Page 47: Functional Characteristics
Functional Characteristics The DOCSIS Module is fully compliant with CompactPCI Specification 2.0 R3.0, Oct.1, 1999. The module contains a 6 U (267 mm) x 340 mm card with an 8 HP (40 mm), double-wide front panel. Physical dimension are provided in Table 8 on page 36. The module installs from the front of the chassis and is hot-swappable.
Page 48: Data Packet Processing
• • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Packet, Scheduling, and Management Processing Devices I 2 C Dual PCI Bridge Memory Controller Modem ASIC Bridge Traffic Port 100Base-T SDRAM...
Page 49: Higher Layer Functions
Figure 14: Packet Processing Layers Management Interface CMTS Management Packet Filtering Packet Header Classifier Suppression Management/ Scheduler Management/ Control PMD Sublayer DOCSIS Data Upconverter to/from HFC Higher Layer Functions The DOCSIS Module provides the following higher layer functions: ! Packet filtering and forwarding—Filters Layer 2, Layer 3, Layer 4, and above based on DOCSIS 1.1 filter functionality.
Page 50: Mac Layer Functions
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide downstream frames into corresponding service flows using service flow IDs (SFIDs). Privacy and Baseline Privacy Plus standards. deconcatenates concatenated MAC frames. and routes accordingly. Verifies header checksum (HCS) and cyclical redundancy checking (CRC).
Page 51: Modem Management
Modem Management The DOCSIS Module exercises functional management over MAC layer and cable modem processes. MAC Layer Scheduling Management at the MAC layer includes the following scheduling functions: ! Queueing upstream requests. ! Transmission opportunity allocation based on MAC messages from cable modems. ! QoS scheduling requirements, including congestion control, which have priority over normal service flows.
Page 52: Physical And Electrical Characteristics
• • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value 233 mm (9.2 in.) card 262 mm (10.3 in., 6 U) front panel 40 mm (1.6 in.) (front panel width) 340 mm (13.4 in.) (excluding front panel and cPCI connectors)
Page 53: Chassis Control Module
Chassis Control Module The Chassis Control Module performs management and monitoring functions for the G10 CMTS, and it provides a single access point for operational and maintenance functions. In addition, the Chassis Control Module runs the Routing Engine. The Chassis Control Module connects with the Hard Disk Module in the rear of the chassis through the midplane.
Page 54: Functional Characteristics
Chassis Control Module cannot be installed in any other slots. • • The Chassis Control Module is the single access point to the G10 CMTS for a command-line • interface or SNMP management application from a remote location. The Fast Ethernet port •...
Page 55: Figure 15: Chassis Control Module Front Panel
Chassis Control Module Figure 15: Chassis Control Module Front Panel • • • • • • • • • • • • • • • Eth0 • • • • • • • • • • • • • • •...
Page 56: Configuration, State, And Alarm Data
One module is required to manage the chassis. • • Each Chassis Control Module consumes 29 watts maximum power. • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 57: Table 11: Chassis Control Module Physical Dimensions
Table 11: Chassis Control Module Physical Dimensions Specification Value Height Width Depth Table 12: Chassis Control Module Connectors Connector Label Eth0 Table 13: Chassis Control Module Switches Switch Label Cut-off Reset Table 14: Chassis Control Module LEDs LED Label Minor Major Crit ∆1 ∆2...
Page 58: Nic Module
NIC Module • NIC Module • • The NIC Module provides a GBIC-based network-side interface for the G10 CMTS, as well as • Ethernet switching functions. Four versions of this module are available: • • ! Single mode, long range—Optical interface for long haul network connections, up to 80 •...
Page 59: Figure 16: Nic Module Front Panel
Figure 16: NIC Module Front Panel PULL CLK PWR RTM OK NIC Module • • • • • • • • • • • • • • • • • • • • • • • • • • • •...
Page 60: Functional Characteristics
The module installs from the front of the chassis and is hot swappable. • • The NIC Module provides the network-side interface of the G10 CMTS. It provides two Gigabit • Ethernet and 24 Fast Ethernet switch ports (eight ports are used for DOCSIS Module •...
Page 61: Table 17: Single-Mode, Long-Range Gbic Specifications
Table 17: Single-Mode, Long-Range GBIC Specifications Parameter Transmitter type Range Data rate (nominal) Average launch power Transmitter extinction ratio Data format Average receive power Connector Regulatory Table 18: Single-Mode, Midrange GBIC Specifications Parameter Transmitter type Range Data rate (nominal) Average launch power Transmitter extinction ratio Data format Average receive power...
Page 62: Table 19: Multimode Gbic Specifications
• • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value Shortwave laser, 850 nm 550 m 1.0625 to 1.250 Gbps -9.5 dBm min. -5 dBm max. 9 dB min. 8B / 10B -22 dBm typical -20.5 dBm max.
Page 63: Table 21: Nic Module Leds
Table 21: NIC Module LEDs Pull 0 through 23 EXT FLT INT FLT Hot SWP Color Function On—Module software is in a safe state; module can be removed. LED is on during power up and off during normal operation. Green On—Successful link of the corresponding Ethernet interface.
Page 64: Chassis Rear Modules
• • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Color Function Green ON—Power is applied to the module. Green ON—Initialization successfully completed. Green ON—Failure detected in the module. Amber ON—One or more of the Fast Ethernet or Gigabit...
Page 65: Figure 17: Nic Access Module Front Panel
Chassis Rear Modules Figure 17: NIC Access Module Front Panel • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •...
Page 66: Hfc Connector Module
• • • JUNOSg 3.0 G10 CMTS Hardware Guide If a NIC Module is used in a version 2 chassis, you must use a SIM opposite each DOCSIS Module to provide the Ethernet connectivity between a DOCSIS Module and a NIC Module (through the midplane).
Page 67: Figure 18: Hfc Connector Module Rear Panel
Figure 18: HFC Connector Module Rear Panel US 0 US 1 US 2 US 3 Eth0 Eth1 DS 0 DS 1 DS 2 DS 3 Chassis Rear Modules • • • • • • • • • • • • •...
Page 68: Figure 19: G10 Cmts Data Flow
Chassis Rear Modules • Figure 19: G10 CMTS Data Flow • • • Downstream RF • DOCSIS Frames in MPEG Stream • • • • Downstream • • • • • • • • • Hybrid • Fiber/Coax • •...
Page 69: Switched I/O Module
Upstream data follows the path in reverse order, starting with data coming into the upstream F-connectors. Figure 19 on page 52 shows this data flow. Also see “G10 CMTS Components” on page 8.Table 24 summarizes the definitions of the Fast Ethernet LEDs on the SIM.
Page 70: Figure 20: Sim Rear Panel
• • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Function On—Link is present. Off—Link is not present. Blinking—Activity on link. On—100Base-T mode. Off—10Base-T mode.
Page 71: Hard Disk Module
Hard Disk Module The Hard Disk Module contains a 6 U (267 mm) x 80 mm card with a 4 HP (20 mm), single-wide rear panel. The module installs from the rear of the chassis and is hot-swappable. The Hard Disk Module contains the system nonvolatile memory implemented as a hard disk. There must be one Hard Disk Module for each Chassis Control Module.
Page 72: Figure 21: Hard Disk Module Rear Panel
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 73: System Architecture Overview
Chapter 3 System Architecture Overview This chapter provides an overview of the G10 CMTS’s system architecture, discussing the following topics: ! JUNOSg Internet Software Overview on page 57 ! Data Path Processing on page 62 JUNOSg Internet Software Overview The JUNOSg software provides Internet Protocol (IP) routing software, as well as software for interface, cable, network, and chassis management.
Page 74: Routing Engine Software Components
• • • JUNOSg 3.0 G10 CMTS Hardware Guide by the Internet Engineering Task Force (IETF). OSPF is a link-state protocol that makes routing decisions based on the SPF algorithm. Bellman-Ford algorithm. RIP is a distance-vector protocol. The JUNOSg RIP software is compatible with RIP Version 1.
Page 75: Routing And Forwarding Tables
Routing and Forwarding Tables A primary function of the JUNOSg routing protocol process is to maintain the Routing Engine’s routing table and to determine the active routes to network destinations. It then installs these routes into the Routing Engine’s forwarding table. The JUNOSg kernel then copies this forwarding table to the Packet Forwarding Engine.
Page 76: Interface Process
Forwarding Engine, including keeping the Packet Forwarding Engine’s copy of the forwarding • table synchronized with the master copy in the Routing Engine. • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 77: Tools For Accessing And Controlling The Software
Tools for Accessing and Controlling the Software The primary means of accessing and controlling the JUNOSg software is the CLI. The CMTS provides two ports on the Chassis Control Module for connecting external management devices to the Routing Engine and hence to the JUNOSg software: ! Fast Ethernet management port (Eth0)—Connects the Routing Engine to a management LAN (or any other device that plugs into an Ethernet connection) for out-of-band management of the CMTS.
Page 78: Data Path Processing
• • • JUNOSg 3.0 G10 CMTS Hardware Guide A packet is received on the Gigabit Ethernet interface of a NIC Module and is forwarded to a DOCSIS Module over a Fast Ethernet connection. If you have configured and applied a subscriber management input filter, the packet is evaluated based on the filter configuration and is either dropped or passed.
Page 79: Upstream Data Path
Upstream Data Path Following is a description of the flow of a packet through the upstream data path of a DOCSIS Module: If you have configured and applied a subscriber management or IEEE 802.1 input filter, a packet received on a cable interface of a DOCSIS Module is evaluated based on the filter configuration and is either dropped or passed.
Page 80: Figure 22: G10 Cmts Data Flow
Data Path Processing • Figure 22: G10 CMTS Data Flow • • • • • • • Fiber/Coax • • • • • • • • • • • • • • • • • • • • • •...
Page 81: Part
Part 2 Initial Installation ! Prepare the Site on page 67 ! Install the CMTS on page 93 ! Connect the Power and Perform Initial Configuration on page 123 • • • • • • • • • • • •...
Page 82 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 83: Prepare The Site
Juniper Networks field engineers. All the steps required to successfully install the G10 CMTS are summarized at the end of this chapter in Table 38 on page 90.
Page 84: Safety Precautions
• ! We recommend the use of a lift to install the G10 CMTS. • • ! Do not attempt to lift the G10 CMTS alone. If a lift is not used, we recommend at least • • • •...
Page 85 (such as ungrounded equipment or power cords, or damp, moist areas that could conduct electricity). ! Ensure that the power supply switches on the rear of the G10 CMTS are in the OFF (O) position prior to connecting any power cords.
Page 86: Notices
• • • • ! Do not operate the G10 CMTS without the front and rear fan trays that are shipped with • • • ! Do not apply torque to screws that is below or above the specifications provided herein.
Page 87: Power
Power The G10 CMTS can be configured with either AC or DC power supply modules. To support a fully-populated CMTS, the installation site must be able to source 1500 watts of input power. AC Power The G10 CMTS requires an AC power source that operates within a voltage and frequency range of 100 to 240 VAC and 47 to 63 Hz.
Page 88: Dc Power
• DC Power • • The G10 CMTS requires a DC power source that operates within a voltage range of –36 to • –75 VDC. Unlike the AC configuration, the DC power transition modules do not operate • independently. Each DC power transition module supports the power supplies in both •...
Page 89: Mounting
Mounting The G10 CMTS can be mounted in a 19-inch EIA RS-310-C equipment rack or a 23-inch AT&T DATAPHONE equipment rack. You can install the CMTS into non-standard racks by using the additional rail mounting bracket holes in the CMTS.
Page 90: Tools And Equipment Required For Installation
• • ! Ethernet cables with RJ-45 connectors • • You need the following equipment to configure the G10 CMTS and verify that the RF system • has been set up properly: • • ! PC with asynchronous terminal emulation •...
Page 91: Coaxial Cable Requirements
HFC network connections, and CMTS downstream and upstream transmissions. The information collected allows field engineers to verify that the installation site environment is compatible with the G10 CMTS. Table 27 is provided to collect information regarding the RF plant and HFC environment.
Page 92: Table 27: Rf Plant/Hfc Environment Characterization
• • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value ____ HFC ____ All Coax ____ max ____ average ____ max ____ average ____ max ____ average ___:1 upstream ___:1 downstream ____ dB ____ dB...
Page 93: Table 28: Existing Docsis Service Characterization
Table 28: Existing DOCSIS Service Characterization Parameter 1st DOCSIS Service Upstream RF bandwidth allocated Upstream modulation type Upstream input level expected at CMTS FEC enabled? If yes, FEC level parameters (T and K) Upstream measured C/N Downstream RF bandwidth allocated Downstream modulation type Downstream output signal level (relative to analog video) Downstream measured C/N...
Page 94: Table 29: Upstream Cmts Parameter Characterization
• • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Port 1 Port 2 ____ : 1 ____ : 1 ____ dBmV ____ dBmV _ QPSK _ 16QAM (CH0) _ QPSK _ 16QAM (CH0) _ QPSK _ 16QAM (CH1)
Page 95 Upstream Parameters Port 0 FEC enabled? _____ yes _____ no If yes, FEC level parameters ____ T ____ K (CH 0) ____ T ____ K (CH 1) ____ T ____ K (CH 2) ____ T ____ K (CH 3) ____ T ____ K (CH 4) ____ T ____ K (CH 5) ____ T ____ K (CH 6) ____ T ____ K (CH 7)
Page 96: Table 30: Downstream Cmts Parameter Characterization
• • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Port 0 Port 1 ____ : 1 ____ : 1 ____ MHz ____ MHz _ 64QAM _256QAM _ 64QAM _256QAM ____ dB ____ dB...
Page 97: Table 31: Upstream Frequency Spectrum Utilization
Table 31: Upstream Frequency Spectrum Utilization Frequency Description of Utilization 5 – 6 MHz 6 – 7 MHz 7 – 8 MHz 8 – 9 MHz 9 – 10 MHz 10 – 11 MHz 11 – 12 MHz 12 – 13 MHz 13 –...
Page 98: Summary Checklist
Table 32 provides a summary checklist of the pre-installation requirements. You should • complete and review this checklist with field engineers to ensure the installation site is • prepared for installing the G10 CMTS. • • • Table 32: Pre-Installation Requirement Summary Checklist •...
Page 99: Noise Measurement Methodology
Noise Measurement Methodology This section describes the methodology for conducting average and peak upstream noise measurements. The procedures establish a consistent methodology for obtaining the requested information during the characterization of the installation site. We recommend you use the HP 8591C spectrum analyzer for taking these measurements. Average Upstream Noise Measurement This section defines a procedure for taking the average upstream noise measurements required as part of the RF plant and HFC environment characterization.
Page 100: Peak Upstream Noise Measurement
• • • • After completing the measurement, the analyzer display should resemble Figure 24 on • page 85. • JUNOSg 3.0 G10 CMTS Hardware Guide Value 2 MHz 45 MHz 100 kHz 30 kHz 5 dB/div 0 dB 0 dBmV...
Page 101: Additional Characterization Tables
Figure 24: Peak Upstream Noise Measurement Example Additional Characterization Tables If the installation site supports more than two DOCSIS services, you can record the characterization of the additional services in Table 35. In addition, if the CMTS configuration includes more than one DOCSIS Module, you can use Table 36 and Table 37 to record the data.
Page 102: Table 35: Existing Docsis Service Characterization
• • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value ____ MHz (max) ____ MHz (min) ____ QPSK ____ 16QAM ____ dBmV ____ yes ____ no ____T ____ K ____ dB ____ MHz (max) ____ MHz (min)
Page 103: Table 36: Upstream Cmts Parameter Characterization
Table 36: Upstream CMTS Parameter Characterization Upstream Parameters Port 0 DOCSIS Module #___ Node combining ratio per ____ : 1 port Expected interfaces per port Expected port input level ____ dBmV Modulation type _ QPSK _ 16QAM (CH0) (where applicable) _ QPSK _ 16QAM (CH1) _ QPSK _ 16QAM (CH2) _ QPSK _ 16QAM (CH3)
Page 104 • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Port 1 Port 2 _____ yes _____ no _____ yes _____ no ____ T ____ K (CH 0) ____ T ____ K (CH 0) ____ T ____ K (CH 1)
Page 105: Verification Of Shipping Cartons
___ [J] (increments) Verification of Shipping Cartons Prior to beginning the installation of the G10 CMTS, you should verify that the contents of the shipping cartons are identical to the contents listed on the packing lists. In addition, you should carefully inspect the shipped contents to ensure that they are not damaged in any manner.
Page 106: G10 Cmts Installation Checklist
Table 38 summarizes all the steps outlined in this document that are required to successfully • install the G10 CMTS in the headend. We recommend that copies of this table be made and • used to keep track of the installation status of each G10 CMTS.
Page 107 Attach a PC to the Chassis Control Module Connect the serial cable to the COM port on the Chassis Control Module Connect the other end of the serial cable to the serial port on the PC G10 CMTS Installation Checklist Page Number Completion Status...
Page 108 • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Page Number Completion Status page 119 page 123 page 127 page 128...
Page 109: Install The Cmts
Chapter 5 Install the CMTS This chapter describes the complete installation procedure for the G10 CMTS. It is assumed that you have followed all safety precautions and procedures described in “Prepare the Site” on page 67 prior to performing the procedures presented in this chapter. We recommend that the entire installation process in this chapter be read prior to performing the actual G10 CMTS installation.
Page 110: Ground The Chassis
Ground the Chassis • • Prior to rack mounting the G10 CMTS, you should install an earth ground strap on the chassis, • particularly if the sides of the chassis will be inaccessible after it is rack mounted. Figure 6 on •...
Page 111 ! A minimum of 3 inches between each side of the chassis and any other object. Figure 25 on page 96 illustrates the air flow through the chassis. If there is no other equipment installed in the rack, you should install the G10 CMTS as low as possible into the rack.
Page 112: Figure 25: Air Flow Through Chassis
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 113: Figure 26: Bottom Of Chassis
G10 CMTS onto the equipment shelf. Figure 27 on page 98 illustrates the proper manner in which to manually lift the chassis such that the risk of injury is minimized.
Page 114: Figure 27: Lifting The Chassis
• • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Powe Fault Powe Fault Powe Powe Fault Fault Powe Fault Powe Fault Powe Fault Powe Fault...
Page 115: Figure 28: Rack-Mounted Chassis
Figure 28: Rack-Mounted Chassis Po we Fa ul t Po we Fa ul t Po we Fa ul t Po we Fa ul t Po we Fa ul t Po we Fa ul t Po we Fa ul t Po we Fa ul t Et h0 Et h0...
Page 116: Figure 29: Rack Fully Populated With Three G10 Cmts Chassis
Rack Mounting • Figure 29: Rack Fully Populated with Three G10 CMTS Chassis • • • • • • • • • • • • • • • • • • • • • • • • • • •...
Page 117: Install Power Supplies
(AC or DC) are used together. Do not attempt to remove or reconfigure the keys. You must replace the power supply faceplate and power supply filler panels prior to powering on the G10 CMTS to ensure that proper air ventilation occurs throughout the chassis, and to reduce EMI emissions.
Page 118: Figure 30: Power Supply Installation
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 119: Install A Docsis Module
4 (for domain A) and slots 10 through 13 (for domain B). HFC Connector Modules and SIMs are installed in the rear of the G10 CMTS chassis in card cage slots 1 through 4 (for domain A) and slots 10 through 13 (for domain B). See Figure 10 on page 25 for an illustration of the chassis domains.
Page 120: Figure 31: Air Management Module Removal
• • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Tighten the two retainer screws by applying 3 in-lb of torque to each screw.
Page 121: Install An Hfc Connector Module Or Sim
Figure 32: DOCSIS Module Installation Install an HFC Connector Module or SIM To install an HFC Connector Module or SIM, follow this procedure: If applicable, remove the air management panel from the slot by loosening the two self-contained screws at the top and bottom of each panel. Remove the module from its anti-static bag, being careful to avoid directly touching any component on the module.
Page 122 • • • JUNOSg 3.0 G10 CMTS Hardware Guide If the upper or lower ejector of the module is locked in the horizontal position, press upward or downward on the ejector release while simultaneously pulling the ejector away from the module faceplate. Each ejector should rest at approximately 45° away from its locked position.
Page 123: Figure 33: Hfc Connector Module Installation
Figure 33: HFC Connector Module Installation E t h E t h Install an HFC Connector Module or SIM • • • • • • • • • • • • • • • • • • • • • •...
Page 124: Install A Chassis Control Module
Install a NIC Module • • The G10 CMTS chassis accommodates a maximum of two NIC Modules in slots 5 and 9 for • domain A and domain B. NIC Modules are shipped from the factory with two multimode •...
Page 125: Cable An Hfc Connector Module Or Sim
Cable an HFC Connector Module or SIM This section describes how to connect the four downstream and four upstream F-connector ports of an HFC Connector Module or SIM. This section also describes how to connect the two Fast Ethernet ports on an HFC Connector Module or SIM. Cable the F-connector Ports Each DOCSIS Module, and its corresponding rear HFC Connector Module or SIM, support a total of four downstream interfaces, where one interface is assigned to each physical...
Page 126 • • • JUNOSg 3.0 G10 CMTS Hardware Guide Select the first node in the cable plant for assignment to the first of four downstream ports. Connect the coaxial cable associated with the first node to the F-connector labeled DS0 on the HFC Connector Module or the SIM.
Page 127 When connecting nodes to the upstream ports of an HFC Connector Module or SIM, do not split a coaxial cable from one node and attach it to more than one upstream port. Doing so prevents you from using the complete features of a DOCSIS Module that are designed for supporting four separate nodes or four groups of nodes that are combined.
Page 128: Figure 35: Rear Coaxial Cable Connections
• • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide D S A D S A U S A D S B D S 0 U S A D S B D S 0 U S B...
Page 129: Cable A Chassis Control Module
Cable a Chassis Control Module The Chassis Control Module contains a Fast Ethernet RJ-45 port labeled Eth0 on its front panel (see Figure 15 on page 39). This port is used for the management interface to the CMTS. To connect to the Chassis Control Module management port, follow this procedure: Carefully thread the Ethernet cable into the cable channel from the rear of the chassis (see Figure 6 on page 13) until it extends through the opening of the power supply faceplate.
Page 130: Figure 36: Nic Module Cabling - Front View
• • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Power Power Power Power Power Fault Fault Fault Fault Fault...
Page 131: Cable A Nic Access Module
Cable a NIC Access Module This section describes how to interconnect up to two NIC Access Modules to multiple HFC Connector Modules or SIMs. The procedure assumes that a NIC Module supports only the DOCSIS Modules installed in the same domain of the chassis. Therefore, if five or more DOCSIS Modules are installed in the system, two NIC Modules are needed to support them.
Page 132 If you have reached this step in the procedure, at least five HFC Connector Modules or SIMs are installed in the G10 CMTS, and a second NIC Access Module and its corresponding cable are required to complete the interconnection procedure. If applicable, remove the protective cover that is inserted into the RJ-21 end of the NIC Access Module cable.
Page 133: Figure 37: Nic Access Module Cable Connections
Figure 37: NIC Access Module Cable Connections D S 0 D S 0 U S 0 D S 1 D S 0 U S 0 D S 1 U S 1 U S 0 D S 2 D S 1 U S 1 D S 2 U S 2...
Page 134: Table 39: Nic Access Module Wiring Plan
• • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide NIC Access Module in Slot 9 Rear Module – Slot / Port NAM Cable / Port Reserved Cable 1 / PORT 1 Reserved Cable 1 / PORT 2...
Page 135: Attach A Pc To The Chassis Control Module
Connect to Power Sources AC Power Each AC power transition module in the G10 CMTS chassis contains a standard IEC 15 A three-prong male AC power receptacle for connecting to an AC power source (see Figure 6 on page 13). Facing the rear of the chassis, the AC power transition modules on the right and left sides of the chassis independently support the power supplies in domain A and domain B.
Page 136: Figure 38: Ac Power Cord And Retainer Clip
Plug the male end of each 15 A power cord into independent power sources. Always use AC power sources that support the ground prong of the power cord. The G10 CMTS power supplies are autosensing which enables them for usage with 115 VAC or 230 VAC.
Page 137: Dc Power
To connect the DC power transition modules to their power sources, follow this procedure: The G10 CMTS is shipped with ring lugs that are used to connect the DC power cord to the DC power transition module terminal block. You must crimp these ring lugs to the negative (–) and positive (+) wires of the DC power cord in order to properly connect to...
Page 138: Figure 39: Dc Power Transition Module
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 139: Connect The Power And Perform Initial Configuration
(|) position (see Figure 38 on page 120). There is no requirement that the two power switches be turned on in any particular order. If the G10 CMTS is DC powered, the system will be powered up when the DC power transition modules have been connected to the DC power sources.
Page 140: Table 40: Power Supply Leds
(see “Replace a Fan Tray” on page 162). To minimize the risk of damage to the G10 CMTS, you should replace a failed fan tray as soon as possible to ensure that proper air ventilation occurs throughout the chassis.
Page 141: Table 41: Docsis Module Led Status
Immediately after the G10 CMTS is powered on, check that the Test LED on every DOCSIS Module faceplate is green and blinking (see Figure 12 on page 30). This indicates that the module’s self-test is running. Continue to monitor each module’s Test LED until it stops blinking.
Page 142: Table 42: Chassis Control Module Led Status
[TBD] Not safe to remove module. Immediately after the G10 CMTS is powered on, wait for the OK LED on the NIC Module faceplate to illuminate green, which indicates the module initialization has been successfully completed (see Figure 16 on page 43). Some LEDs will be in one state during the initialization (OK LED not illuminated), then change to another state after the initialization (OK LED illuminated green).
Page 143: Table 44: Nic Access Module Led Status
One or more of the FE or GE ports is enabled, but unused. Before you replace any module that appears to be faulty based on its LED status, contact Juniper Networks customer support for technical assistance. Connect the Power and Perform Initial Configuration Power On and Configure the PC •...
Page 144: Perform Initial Software Configuration
• • • JUNOSg 3.0 G10 CMTS Hardware Guide After a successful connection is made between the PC attached to the serial port of the Chassis Control Module and the CMTS, the terminal emulation screen on your PC will display a banner and prompt you for a login username. Log in as the root user. There is no password.
Page 145 Configure the IP address of a backup router, which is used only while the routing protocol is not running. [edit] root@# set system backup-router address Configure the IP address of a DNS server. [edit] root@# set system name-server address Set the root authentication password by entering either a clear-text password, an encrypted password, or an ssh public key string (DSA or RSA).
Page 146 • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide statements. Then, commit the changes to activate them on the CMTS. [edit] root@host-name# commit [edit] root@host-name# exit root@host-name>...
Page 147: Troubleshooting And Maintenance
Part 3 Troubleshooting and Maintenance ! RF Measurements on page 133 ! Troubleshooting on page 141 ! Replacement Procedures on page 159 • • • • • • • • • • • • • • • • • • •...
Page 148 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 149: Rf Measurements
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”...
Page 150: Downstream Rf Measurement In Catv Mode
This section describes the procedure for measuring the downstream signal power from the • G10 CMTS using CATV mode on the HP8591C CATV analyzer. If your spectrum analyzer does • not support CATV mode, you can use the spectrum analyzer mode as described in •...
Page 151: Downstream Rf Measurement In Spectrum Analyzer Mode
Figure 40: Downstream RF Signal (CATV Mode) Downstream RF Measurement in Spectrum Analyzer Mode To measure the downstream signal power using the spectrum analyzer mode on the HP8591C CATV analyzer, follow this procedure: Connect the spectrum analyzer to a cable within the plant that carries the downstream signal you are measuring.
Page 152: Figure 41: Downstream Rf Signal (Spectrum Analyzer Mode)
• • • JUNOSg 3.0 G10 CMTS Hardware Guide Press the SPAN key and enter 6 MHz. Press the BW key and turn video averaging on by selecting VID AVG ON. The default number of averages is 100. You can change the number of averages by using the numeric keypad.
Page 153: Upstream Rf Measurement
Upstream RF Measurement To measure an upstream signal to the CMTS using zero span mode on the HP8591C CATV analyzer, follow this procedure: Connect the spectrum analyzer to a cable within the plant that carries the upstream signal you are measuring. The signals are received on one of the upstream ports of the HFC Connector Module or SIM (US0 through US3).
Page 154: Figure 42: Single Upstream Burst
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide similar to the display in Figure 42 on page 138. The first three graticule columns represent the upstream burst transmission of a single cable modem, including the preamble. represents the median power level of the signal. In Figure 42, the marker is approximately positioned at a median level of 0.65 dBmV.
Page 155: Figure 43: Multiple Upstream Bursts
Figure 43 represents the spectrum analyzer display of multiple upstream bursts. This display was produced by repeating this procedure with the following modifications: ! The reference level in step 7 was set to 10 dBmV. ! The sweep time in step 10 was set to 20 milliseconds. Figure 43: Multiple Upstream Bursts Upstream RF Measurement •...
Page 156 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 157: Troubleshooting
! HFC Plant Related Issues on page 156 Features for Troubleshooting The G10 CMTS provides powerful features that aid you with troubleshooting CMTS, cable modem, and HFC plant related issues, including the flap list, the local event log, and various CLI commands that display relevant statistics.
Page 158: Flap List
High and Low, are provided. • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide user@host> show cable flap-list Interface Us/Port LEvnt Total FAdjAmnt SNRavg MERavg CERavg ca-0/2/1 ca-0/2/0 PAdj FAdj...
Page 159: Table 45: Flap List Association To Potential Issues
Table 45: Flap List Association to Potential Issues Output Field IM (initial maintenance retry flaps) SM (missed station maintenance flaps) CER (codeword error rate flaps) CERavg (average CER) PAdj (power adjust flaps) FAdj (frequency adjust flaps) SNRavg (SNR average) MERavg (MER average) Value Potential Issues ! DHCP server issues...
Page 160 • • • JUNOSg 3.0 G10 CMTS Hardware Guide provisioning and the HFC plant conditions are considered satisfactory. Use these values to establish an operational baseline. problematic nodes in the HFC plant. For example, if the flap list is sorted by MERavg and the flap entries with the lowest MERavg values are all within the same cable interface, your diagnostic procedures can focus on a particular area of the return path.
Page 161: Local Event Log
DOCS-CABLE-DEVICE-MIB (RFC 2669). This log can assist you with troubleshooting various issues. The OSSI specification defines required events that a CMTS must support. In addition, the G10 CMTS supports vendor-specific events. To view the log, issue the show log cable command. Table 46 provides the correspondence between the display output fields and the DOCS-CABLE-DEVICE-MIB objects.
Page 162: Operational Commands
! show cable modem summary—Display a summary of cable modems in each • • • • JUNOSg 3.0 G10 CMTS Hardware Guide associated operational parameters. modems. flows for a list of cable modems. For DOCSIS 1.0 cable modems, the counters correspond to the equivalent primary service flows created corresponding to the primary class-of-service.
Page 163: Serviceguard Management System
Management System. The ServiceGuard Management System provides a headend technician with an integrated tool to monitor and analyze the return path network performance at the G10 CMTS by collecting measurements gathered by the Broadband Cable Processor ASIC, processing them into useful statistical information, and presenting them graphically. Statistics...
Page 164: Cmts Power And Booting Issues
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide their power sources. LED is not green or if the Fault LED is illuminated, take the appropriate actions described in Table 40 on page 124. the chassis. See “Install the CMTS” on page 93 for more information.
Page 165: Cmts Powers Down
CMTS is operating. These requirements ensure that proper air ventilation occurs throughout the chassis. Ensure that proper clearance is maintained between the G10 CMTS chassis and its surroundings to allow adequate air ventilation to flow into the air intakes and out of the air exhaust.
Page 166: Ideal Hfc Plant Configuration Issues
• • • JUNOSg 3.0 G10 CMTS Hardware Guide with the forward and return path topology of the HFC plant. For example, suppose a cable modem resides in cable interface 0 (MAC domain 0), which contains downstream interface 0 and upstream interfaces 0 and 1. Also, suppose the forward and return paths are connected to downstream port 0 and upstream port 0 of an HFC Connector Module or SIM.
Page 167: Cable Modem Cannot Establish Ip Connectivity
Cable Modem Cannot Establish IP Connectivity If a cable modem cannot establish IP connectivity, the cause might be one or more of the following : ! The DHCP server could not be accessed because the network is down. ! The DHCP server is down. Ping the DHCP server IP address using the ping command to see if the server is responding.
Page 168: Cable Modem Throughput Is Slow
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide Ensure the configuration settings are valid and are consistent with the DOCSIS specifications. cable modems continue the registration process while continuing to retry the TOD request. However, some older cable modems do not attempt to register if they time out while waiting for a TOD response.
Page 169 ! The cable modem belongs to a downstream or upstream interface on which a traffic scheduling policy is assigned. Packets that exceed the maximum sustained traffic rate (MSTR) are dropped or shaped, depending on the traffic scheduling policy configuration. Issue the show cable policy traffic-scheduling command to display configured traffic scheduling policies.
Page 170 • • • JUNOSg 3.0 G10 CMTS Hardware Guide You can compute the approximate upstream channel utilization by dividing the measured bandwidth calculated in step 5 by the derated maximum bandwidth calculated in step 7: (4,384,549 / 4,710,400)=93 percent. This represents a highly utilized interface.
Page 171 ! Congestion exists in the downstream. You can compute the approximate downstream channel utilization by monitoring the ifOutOctets object in the DOCS-IF-MIB (RFC 2670). The ifOutOctets object contains the total number of octets transmitted on an interface, including data packets as well as MAC layer packets, and includes the length of the MAC header.
Page 172: Cable Modem Is Dropped
• • • • • JUNOSg 3.0 G10 CMTS Hardware Guide CPE is affecting the performance of the cable modem. The CPE performance can be affected by one or more of the following: A slow microprocessor. Not enough RAM. Not enough disk space.
Page 173: Cable Modem Cannot Successfully Range
Cable Modem Cannot Successfully Range If a cable modem cannot successfully range, the cause might be one or more of the following: ! There is too much attenuation in the return path. If the power level of the cable modem’s signal measured at the CMTS is not within the tolerable limits of the CMTS due to excessive attenuation, the CMTS responds with an abort ranging status in the ranging response (RNG-RSP) message to the cable modem.
Page 174: Part
• • • JUNOSg 3.0 G10 CMTS Hardware Guide transmissions from the cable modem. A high CERavg value or a low MERavg value in the flap list is indicative of this. Uncorrectable codewords cause packets to be dropped by the CMTS, which reduces the cable modem throughput.
Page 175: Replacement Procedures
! Fan Trays on page 162 ! Module Removal on page 166 Power Supplies The G10 CMTS can operate in a power redundant or non-redundant configuration. Power redundancy consists of redundant power supplies, power transition modules, and power sources: ! Power supplies—The G10 CMTS can accommodate up to ten power supplies within domains A and B.
Page 176: Remove Power Supplies
• • • Remove Power Supplies • • The power supplies in the G10 CMTS are hot-swappable, which means that the system can • remain powered up while a power supply is being removed or installed. • • • •...
Page 177: Figure 44: Power Supply Removal
See “Install Power Supplies” on page 101 for power supply installation instructions. Figure 44: Power Supply Removal The power supply faceplate and power supply filler panels must be installed before you power on the G10 CMTS to ensure that proper air ventilation occurs throughout the chassis, and to reduce EMI emissions.
Page 178: Fan Trays
Nevertheless, take care when inserting your hand anywhere in the vicinity of an operating fan. ! Operating the G10 CMTS without fully functional fan trays might cause irreparable damage or reduce the life of one or more modules in the system. After removing a fan tray, you must immediately install its replacement.
Page 179: Front Fan Trays
Front Fan Trays To replace a front fan tray, follow this procedure (see Figure 45 on page 164). Remove the air intake faceplate by pulling the flanges on each side of the faceplate away from the chassis until the faceplate ball studs are removed from the air intake faceplate clips.
Page 180: Figure 45: Front Fan Tray Replacement
Front Fan • Tray Retainer • • Front Fan • Tray • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Fan Tray Fan Tray Midplane Rail Power Connector Rail...
Page 181: Figure 46: Rear Fan Tray Replacement
Figure 46: Rear Fan Tray Replacement Midplane Power Connector Fan Tray Flange Rear Fan Tray DS 0 US 0 DS 1 US 1 DS 2 US 2 DS 3 US 3 Eth0 Eth1 Fan Trays • • • • • •...
Page 182: Module Removal
• • • • • JUNOSg 3.0 G10 CMTS Hardware Guide If a DOCSIS Module is being hot-swapped, this procedure assumes you have moved all services supported by that module to another DOCSIS Module. Loosen the two retainer screws. Press upward and downward on the ejector releases (action #1 in Figure 47 on page 167), but do not pull on the ejectors until the blue Hot Swap LED on the faceplate is illuminated (see Figure 12 on page 30).
Page 183: Figure 47: Docsis Module Removal
Figure 47: DOCSIS Module Removal You must install air management modules and air management panels in all empty slots while operating the G10 CMTS to ensure that proper air ventilation occurs throughout the chassis, and to reduce EMI emissions. Module Removal •...
Page 184: Remove An Hfc Connector Module Or Sim
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide Disconnect all cables that are attached to the module ports. If appropriate, tag each cable with its corresponding module port. Loosen the two retainer screws. Press upward and downward on the ejector releases (action #1 in Figure 48 on page 169).
Page 185: Remove A Chassis Control Module
Figure 48: HFC Connector Module Removal Remove a Chassis Control Module The Chassis Control Module is hot-swappable. However, if you hot-swap the Chassis Control Module, all services supported by the CMTS are lost because the CMTS cannot operate without the Chassis Control Module. To remove a Chassis Control Module, follow this procedure: Stop the CMTS software by issuing the request system halt command: user@host>...
Page 186: Remove A Hard Disk Module
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide Stop the CMTS software by issuing the request system halt command: user@host> request system halt Power down the CMTS. Follow the same procedure described in “Remove an HFC Connector Module or SIM” on...
Page 187: Part
Part 4 Appendixes ! Agency Certifications on page 173 ! Radio Frequency (RF) Specifications on page 175 ! EIA Channel Plans on page 181 • • • • • • • • • • • • • • • • •...
Page 188 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 189: Appendix A Agency Certifications
Appendix A Agency Certifications This appendix lists agency compliance and certifications for the G10 CMTS. Safety ! UL 60950 (US, Canada) ! EN 60950 (Europe) ! This equipment is intended only for installation in a restricted access location within a building.
Page 190: Part
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received,...
Page 191: Radio Frequency (Rf) Specifications
Appendix B Radio Frequency (RF) Specifications For reference purposes, Table 47 through Table 51 are reproduced from the CableLabs DOCSIS Radio Frequency Interface Specification, SP-RFI-I05-991105. For the complete DOCSIS specifications, see the appropriate CableLabs document. This appendix contains the following tables: ! Downstream RF Channel Transmission Characteristics on page 176 ! Upstream RF Channel Transmission Characteristics on page 177 ! Downstream RF Signal Output Characteristics on page 178...
Page 192: Table 47: Downstream Rf Channel Transmission Characteristics
• • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value Cable system normal downstream operating range is from 50 MHz to as high as 860 MHz. However, the values in this table apply only at frequencies >= 88 MHz.
Page 193: Table 48: Upstream Rf Channel Transmission Characteristics
Table 48: Upstream RF Channel Transmission Characteristics Parameter Frequency range Transit delay from the most distant CM to the nearest CM or CMTS Carrier-to-noise ratio Carrier-to-ingress power (the sum of discrete and broadband ingress signals) ratio Carrier- to-interference (the sum of noise, distortion, common-path distortion and cross-modulation) ratio Carrier hum modulation Burst noise...
Page 194: Table 49: Downstream Rf Signal Output Characteristics
• • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Value 91 to 857 MHz ± 30 kHz Adjustable over the range 50 to 61 dBmV 5.056941 Msym/sec 5.360537 Msym/sec 6 MHz ~18% Square Root Raised Cosine shaping ~12% Square Root Raised Cosine shaping <...
Page 195: Table 51: Docsis Maximum Upstream Channel Rates And Widths
Table 51: DOCSIS Maximum Upstream Channel Rates and Widths Symbol Rate Channel Width (ksym/sec) (kHz) 1,280 1,600 2,560 3,200 1. Channel width is the -30 dB bandwidth. Radio Frequency (RF) Specifications Bit-rate/sec Bit-rate/sec (QPSK) (16QAM) 320,000 640,000 640,000 1,280,000 1,280,000 2,560,000 2,560,000 5,120,000...
Page 196 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 197: Eia Channel Plans
Appendix C EIA Channel Plans Table 52 lists the EIA (Electronic Industries Association) standard, IRC (Incrementally Related Carrier), and HRC (Harmonically Related Carrier) frequency plans. The frequencies in Table 52 represent the video center frequencies. Add 1.75 MHz to calculate the DOCSIS center frequency. Table 52: EIA Channel Plan Channel T-10...
Page 198 58 / VV • 59 / WW • 60 / XX • 61 / YY • • 62 / ZZ • • JUNOSg 3.0 G10 CMTS Hardware Guide 157.2500 157.2625 163.2500 163.2625 169.2500 169.2625 217.2500 217.2625 223.2500 223.2625 229.2625 229.2625 235.2625...
Page 199 Channel 63 / AAA 457.2500 64 / BBB 463.2500 65 / CCC 469.2500 66 / DDD 475.2500 67 / EEE 481.2500 68 / FFF 487.2500 69 / GGG 493.2500 70 / HHH 499.2500 71 / III 505.2500 72 / JJJ 511.2500 73 / KKK 517.2500...
Page 200 • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide 685.2500 685.2625 691.2500 691.2625 697.2500 697.2625 703.2500 703.2625 709.2500 709.2625 715.2500 715.2625 721.2500 721.2625 727.2500 727.2625 733.2500 733.2625...
Page 201 Channel 943.2500 949.2500 955.2500 961.2500 967.2500 973.2500 979.2500 985.2500 991.2500 997.2500 1003.250 EIA Channel Plans 943.2625 942.0471 949.2625 948.0474 955.2625 954.0477 961.2625 960.0480 967.2625 966.0483 973.2625 972.0486 979.2625 978.0489 985.2625 984.0492 991.2625 990.0495 997.2625 996.0498 1003.2625 1002.0501 EIA Channel Plans •...
Page 202 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 203 Part 5 Index • • • • ! Index on page 189 • • • • • • • • • • • • • • • • • • • • • • • • • • • • •...
Page 204 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide...
Page 205: Index
Index Index Numerics 256QAM...155 64QAM...155, 158 accessory kit...89 agency certifications...173 air exhaust ...17, 95 air intake ...16, 95, 124 faceplate ...16, 163 faceplate clip ...16, 163 air management module ...10, 16, 90, 91, 103, 124, 167 air management panel ...10, 17, 90, 91, 103, 124, 168 air ventilation ...69, 89, 95, 101, 124, 161, 162, 167 alarm...38 alarm cutoff...126...
Page 206 ... 16 • ESD ground point ... 20 • • • JUNOSg 3.0 G10 CMTS Hardware Guide Ethernet management port description ...61 event log ...40 fan tray...16, 17, 70, 92, 123, 124, 149, 162 fans ...29 Fast Ethernet ...42, 44, 109, 111 F-connector ...75, 109, 110...
Page 207 laser clipping ...143, 144 ACO ...126 Chassis Control Module ...41, 126 Critical...126 DOCSIS Module...36, 125 EXT FAULT...127 EXT FLT ...126 fan ...29 fan tray ...149, 162 FAULT ...123 Fault...159 front fan tray...16, 124 Hot Swap ...125, 126, 166 INT FAULT...127 INT FLT ...126 Major...126 Minor ...126...
Page 208 • routing and forwarding tables ... 59 • • • • • JUNOSg 3.0 G10 CMTS Hardware Guide Routing Engine kernel, description ...60 software ...58–60 routing protocols ...58 ServiceGuard Management System ...133, 147 shared secret ...151 shipping carton ...68, 89, 90, 94 short circuit ...125...
Page 209 ventilation ...69, 89, 95, 101, 124, 161, 162, 167 video servers ...7 voltage, power supply...27 Index • • • • • • • • • • • • • • • • • • • • • • • • •...
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Juniper G10 CMTS Hardware Manual

About this Manual

Part

Product Overview

Chapter 1 System Overview

Chapter 2 Hardware Component Overview

Chapter 3 System Architecture Overview

Initial Installation

Chapter 4 Prepare the Site

Chapter 5 Install the CMTS

Chapter 6 Connect the Power and Perform Initial Configuration

Troubleshooting and Maintenance

Chapter 7 RF Measurements

Chapter 8 Troubleshooting

Chapter 9 Replacement Procedures

Appendixes

Appendix A Agency Certifications

Part

Appendix B Radio Frequency (RF) Specifications

Appendix C

EIA Channel Plans

Index

Quick Links

Troubleshooting

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Questions and answers

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Summary of Contents for Juniper G10 CMTS