Service manual

System Overview 1-105
Major power components are described in the following sections except for the
power modules in the drawer and the power managers. For the main power
module see Section 1.15.1, for the auxiliary power module see Section 1.15.2, for
the PSM see Section 1.8.4 and Section 1.12, and for the PBM see Section 1.8.5.
Figure 1–48 is a block diagram of power distribution in a GS80 system. It
shows most of the major components that make up the power distribution
system.
Note that diodes on the subracks and within the drawer are used to “or” 48V so
that whenever either H7504 subrack is on, the OCP and clock are powered.