Power Distribution System - Cabletron Systems 9C214-1 Installation Manual

Introduction

Power Distribution System

The SmartSwitch 9000 uses a distributed DC power distribution system
(Figure 1-2) similar to those used in super computers. Three separate power buses
are used to distribute DC power. The 48 volt DC System Power Bus, located on
the backplane, powers all modules and the system cooling fans. The Diagnostic
Power Bus provides 5 volts DC to all of the system's diagnostic controllers and
the Environmental Module. The INB Termination Power Bus provides 3.3 volts
DC to the SmartSwitch 9000 INB termination modules (ITM).
To offer the greatest variety of power options, the 48 volt DC System Power Bus
and all components that use this bus are capable of operating using voltage
ranging from 40–60 volts DC. This capability allows the SmartSwitch 9000 to
operate from typical AC power and to charge batteries in a battery backup unit or
operate on DC power, such as found in a central office or a battery backup system.
57 volts
DC/DC
Convertor
1-4
100 - 250 volts
AC Power Supply
5 volts 3.3 volts
48 Volt System Power Bus
5 Volt Diagnostic Power Bus
3.3 Volt INB Termination Power Bus
Diagnostic
Controller
Communications
Systems Components
Figure 1-2. Distributed DC Power Distribution System
100 - 250 volts
AC Power Supply
57 volts 5 volts 3.3 volts
DC/DC Diagnostic
Convertor Controller
Communications
Systems Components