Compaq AlphaServer 160 Uživatelská příručka stáhnout pdf (Strana 30)

2-14 AlphaServer GS80/160/320 User’s Guide

2.3.6 Power System Manager Module

Each QBB has one power system manager (PSM) module. This module

monitors CPUs, voltages, temperatures, and blower speed in the

cabinet and reports this information to the system control manager

(SCM).

Figure 2–10 Power System Manager Module

PK0607

The PSM module is connected to other PSM modules and the SCM micro-

processor (located on the standard I/O module) through the console serial bus

(CSB). The SCM is the master; the PSM can only operate as a slave. The PSM

controls the powering on/off and resetting of all modules within the QBB and of

the QBB itself. The PSM also contains three I

C bus interfaces and a serial I/O

bus channel to each CPU in the QBB. The PSM module retrieves information

from the I

C EEROMs residing on the CPUs, memory modules, and the QBB

backplane. The PSM uses a serial I/O port connection to communicate with one

CPU module at a time. The PSM can only perform a function as the result of a

request from the SCM.

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Compaq AlphaServer 160 Uživatelská příručka Strana 30