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19-1
CHAPTER
19
DDC Replacement
This chapter explains the replacement procedures for DDCs (DC-to-DC Converters).
It covers the following:
■ Section 19.1, “Overview of the DDC” on page 19-1
■ Section 19.2, “Active Replacement and Hot Replacement” on page 19-3
■ Section 19.3, “Cold Replacement” on page 19-7
There are three methods for replacing DDCs: active replacement, hot replacement
and cold replacement. For the definition of the replacement method, see Section 4.1,
“Types of Replacement Procedures” on page 4-2.
19.1 Overview of the DDC
This section provides an overview of the DDCs that are mounted on the back plane
of the M8000 (BP_A), and describes their mounting locations.
A DDC supplies power to the back plane. DDCs are duplicated, and active
maintenance can be performed on them.
FIGURE 19-1 indicates the DDC mounting location in the M8000.