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19-1
CHAPTER
19
DDC Replacement
This chapter explains the replacement procedures for DC-to-DC Converters (DDCs). 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 19-2
■ 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 server (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 server.