NonStop NS-Series Planning Guide (H06.04+)

Modular System Hardware
HP Integrity NonStop NS-Series Planning Guide—529567-005
5-11
Logical Synchronization Unit (LSU)
Logically the LSU:
•
Implements a fault domain that affects only a single logical processor
•
Has environmental sense and control (ESC) aspects managed by the logical
processor
•
Supports single-point system power-on
The LSU module consists of two types of FRUs:
•
LSU logic board (accessible from the front of the LSU enclosure)
•
LSU optics adapters (accessible from the rear of the LSU enclosure)
•
AC power assembly (accessible from the rear of the LSU enclosure)
This illustration shows an example LSU configuration as viewed from the rear of the
enclosure and equipped with four LSU optics adapter PICs in positions 50 through 53:
Caution. To maintain proper cooling air flow, blank panels must be installed in all slots that do
not contain logic adapter PICs or logic boards.
LSU
Enclosure
(back)
VST208.vsd
J set in I/O positions 50 - 53 for
logical processors 0 through 7
K set in I/O positions 54 - 57 for
logical processors 8 through 15
LSU Optics
Adapter PIC
B
A
Y
X
C
B
A
Y
X
C
B
A
Y
X
C
B
A
Y
X
C
50 57565554535551
B
A
Y
X
C
LSU Optics Adapter PIC Positions (Slots) 50 - 57
Green LED
(power)
Amber LED
(reset, fault)
Green LEDs
(link status)