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EPS1U Power Supply Design Guide, V1.1
8.5 LED Indicator
STATUS
Required
There will be a single GREEN LED to indicate power supply status. When AC is applied to the PSU and standby
voltages are available the LED shall BLINK GREEN. The LED shall turn ON GREEN to indicate that all the power
outputs are available. Refer to Table 26 for conditions of the LED.
Table 26: LED Indicators
Power Supply Condition Power Supply LED
No AC power to PSU or PSU failure OFF
AC present / Only Standby Output ON BLINK GREEN
Power supply DC outputs ON and OK GREEN
The LED shall be visible on the power supply’s exterior face. The LED location shall meet ESD requirements.
LED shall be securely mounted in such a way that incidental pressure on the LED shall not cause it to become
displaced.
9 MTBF
STATUS
Recommended
The power supply shall have a minimum MTBF at continuous operation of 1) 100,000 hours at 100% load and
45° C, as calculated by Bellcore RPP, or 2) 250,000 hours demonstrated at 100% load and 45° C.