Cabletron Systems 9C214-3, Installation Manual

9C214-3 Power Supply Operation

3-2

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 
LANVIEW diagnostic LEDs. The information gathered by the System Diagnostic 
Controller is available to the network manager via the LCD, as well as via local 
and remote management. If the System Diagnostic Controller fails, the 9C214-3 
power supply has been designed to continue to function and supply power to the 
system. 

Internal Temperature  Sensor

Each 9C214-3 power supply has a built-in temperature sensor for monitoring its 
own internal temperature. The results of the monitoring are available to the 
network manager via LCD, as well as local and remote management.

Power Supply Cooling

Each 9C214-3 power supply includes an internal cooling fan. The System 
Diagnostic Controller monitors the internal temperature of the power supply and 
increases or decreases the fan speed based on that temperature. If the System 
Diagnostic Controller fails, fan speed defaults to 100% to ensure protection of the 
power supply. 

LANVIEW LEDs

The LANVIEW LEDs on the back of the 9C214-3 power supply may be used as an 
aid for troubleshooting.

There are three LANVIEW LEDs visible to the user (Figure 3-1): the PWR Status 
LED, the SMB Status LED, and the Power Supply Level Indicator LED. 

Figure 3-1. 9C214-3 Power Supply LANVIEW LEDs

9C214-3

100%

50%

0%

Load

POWER SUPPLY MODULE

STATUS

P

W

R

S
N
B

PWR STATUS LED

SMB STATUS LED

Power Supply Level Indicator LED