Cabletron Systems 9C214-1, Installation Manual

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3-1
Chapter 3
9C214-1 Power Supply Operation
The 9C214-1 power supply can operate with input voltages ranging from 100–250
VAC at 50/60 Hz. Each 9C214-1 provides a maximum of 1000 watts of power to
the SmartSwitch 9000.
When two power supplies are installed, the system uses a current-sharing scheme
where, under all load conditions, each supply provides 50% (± 5%) of the required
load.
Each 9C214-1 power supply converts the 100–250 VAC to three different DC
outputs for internal use by the system:
• 57 volts supplied to the 48 volt DC System Power Bus for use throughout the
chassis for each installed module and the Environmental Module system fans.
• 5 volts supplied to the Diagnostic Power Bus used by the diagnostic controllers
and the Environmental Module.
• 3.3 volts supplied to the INB Termination Power Bus.
Operating Functions
The 9C214-1 power supply includes the following functions:
• System Diagnostic Controller
• Internal Temperature Sensor
• Power Supply Cooling
System Diagnostic Controller
The System Diagnostic Controller is composed of a Z-80 microprocessor and its
supporting logic. The System Diagnostic Controller monitors the power supply’s
input and output power parameters, as well as the temperature and fan status. In
addition, the System Diagnostic Controller adjusts fan speed and controls the