Hot Insertion; Power Rail Isolation - Sun Microsystems Netra ft 1800 Hardware Reference Manual

TABLE 1-2
Module
Console, alarms and fans
Power supply
PCI carrier
1.5

Hot Insertion

The term Hot Insertion refers to the ability to replace modules without halting or
power-cycling the system. All modules, including the motherboards, support this
facility. During the replacement procedure, the module being replaced is disabled
using the Configuration Management System (CMS).
Hot insertion is supported by three major features of the system:

Power rail isolation

Bus signal isolation
Maintenance bus.
1.5.1 Power Rail Isolation
All front-replaceable modules, except the hard disk drives (HDDs) and RMM drives,
interface directly with the motherboard. The PSU modules provide 14V supply rails
which are distributed to the remaining modules through FET circuit breakers located
on the motherboard. There are also 5V and 3.3V rails distributed to the CPUsets only
and which are protected within the PSUs. The FET circuit breakers are enabled
solely by the actuators in the injection mechanisms as described in Section 1.4.4
"Module Injection Mechanisms" on page 1-6.
Module Locations (Continued)
Mnemonic
CAF
PSU
PCI
Side A Locations Side B Locations
A-CAF B-CAF
A-PSU0 B-PSU0
A-PSU1 B-PSU1
A-PSU2 B-PSU2
A-PCI0 B-PCI0
A-PCI1 B-PCI1
A-PCI2 B-PCI2
A-PCI3 B-PCI3
A-PCI4 B-PCI4
A-PCI5 B-PCI5
A-PCI6 B-PCI6
A-PCI7 B-PCI7
Chapter 1 Introduction 1-9