Overview Of The Ddc - Fujitsu SPARC ENTERPRISE M9000 Service Manual

19
C H A P T E R
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
"Types of Replacement Procedures" on page
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.
4-2.
Section 4.1,
19-1