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Troubleshooting
Features for Troubleshooting
147
!show cable modem unregistered—Display a list of unregistered cable modems and
associated operational parameters.
!show chassis environment—Display environmental information about the CMTS
chassis, including the temperature of each DOCSIS Module, temperature thresholds, and
fan and power supply status.
See the JUNOSg Software Operational Mode Command Reference for more information about
these commands.
ServiceGuard Management System
You can perform spectrum monitoring of the HFC return path by using the ServiceGuard
Management System. The ServiceGuard Mana gement System provides a headend technician
with an integrated tool to monitor and analyze the return path ne twork performance at the
G10CMTS by collecting measurements gathered by the Broadband Cable Processor ASIC,
processing them into useful statistical information, an d presenting them graphically. Statistics
that you can be measure and plot within the ServiceGuard Manage ment System include
noise power and noise power density, signal-to-noise ratio (SNR), modulation error
rate (MER), a nd codeword error rat e (CER).
The ServiceGuard Management System incorporates an integrated impairment identification
tool that monitors statistics to characterize compromised performance to a potential cause
(such as impulse or burst noise, narrowband ingress, or microreflections).
This application allows you to recognize, identify, and troubleshoot issues with the return
path. In addition, you can use this application to map and allocate spectrum for upstream
interfaces.
The ServiceGuard Management System is an optional tool
that is not part of the standard G10CMTS shipment. A
ServiceGuard Management System application must be
purchased to take advantage of this powerful diagnostic
aid.