NEC Univerge SV8500 Operation And Maintenance Manual page 694

(4) The figures below show the power supply system for PIR and TSWR.
PWR 0
DC-DC
CONV
RGU
HOW
SUB
PWR
NFB
-48V
AC-DC Converter
AC
RGU and HOW activate by ACT/ST-BY.
Note:
PWR 0
DC-DC
CONV
-48V
REL
-48V +80V
CHAPTER 5
Figure 5-21 Power Supply to PIR
+5V, +12V, -5V
RGU
CR (for LC)
HOW (for LC)
Figure 5-22 Power Supply to TSWR
+5V, +12V, -5V
-48V
– 647 –
Operation Procedure for System with PIR
DC-DC
CONV
RGU
RGU
HOW
SUB
PWR
NFB
AC-DC Converter
PWR 1
DC-DC
CONV
-48V
+80V
PWR 1
-48V
AC
REL
-48V