Juniper G10 CMTS, Hardware Manual

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Replacement Procedures 159
Chapter 9
Replacement Procedures
This chapter discusses the following topics related to the removal and replacement of CMTS
hardware components:
!
Power Supplies on page 159
!
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.
!
Power transition modules—All G10 CMTS systems are shipped with two power transition
modules installed in each of the two domains to implement power transition module
redundancy. This also facilitates power source redundancy.
!
Power sources—Each power transition module must be powered by sources on different
circuits to implement power source redundancy.
When operating in a power-redundant configuration, a single power-related component can
fail without affecting the operation of the CMTS. However, because the CMTS is no longer
operating as a redundant system, we recommend that you replace the faulty component as
soon as possible. The component can be hot-swapped without powering down the CMTS.
To determine if a power supply has faulted, check the status of the power supply LEDs. If the
Power LED is not illuminate green, or if the Fault LED is illuminated, take the appropriate
actions as described in Table 40 on page 124 .
Before replacing a power supply or any module from the
CMTS, attach one end of an ESD ground strap to your wrist
and attach the other end to the ESD ground strap jack on
the front of the chassis (see Figure 5 on page 12).