Cabletron Systems 9C214-1 Installation Manual

Contents

Introduction1-4Power Distribution SystemThe SmartSwitch 9000 uses a distributed DC power distribution system(Figure 1-2) similar to those used in super computers. Three separate power busesare used to distribute DC power. The 48 volt DC System Power Bus, located onthe backplane, powers all modules and the system cooling fans. The DiagnosticPower Bus provides 5 volts DC to all of the system’s diagnostic controllers andthe Environmental Module. The INB Termination Power Bus provides 3.3 voltsDC to the SmartSwitch 9000 INB termination modules (ITM).To offer the greatest variety of power options, the 48 volt DC System Power Busand all components that use this bus are capable of operating using voltageranging from 40–60 volts DC. This capability allows the SmartSwitch 9000 tooperate from typical AC power and to charge batteries in a battery backup unit oroperate on DC power, such as found in a central office or a battery backup system.Figure 1-2. Distributed DC Power Distribution System100 - 250 voltsAC Power Supply57 volts 5 volts 3.3 voltsAC Power Supply57 volts 5 volts 3.3 voltsDC/DCConvertorDiagnosticControllerCommunicationsSystems ComponentsDC/DCConvertorDiagnosticControllerCommunicationsSystems Components48 Volt System Power Bus5 Volt Diagnostic Power Bus100 - 250 volts3.3 Volt INB Termination Power Bus