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Optical ILA DC Power Supply Description

The DC power supplies in the optical ILA (see Figure 1) are hot-removable and hot-insertable field-replaceable units (FRUs) that you can install without powering off the optical ILA or disrupting the ILA function. The DC version of the optical ILA has two DC power supplies. Both the power supplies are initially installed at the factory.

Figure 1: DC Power Supply in an Optical ILADC Power Supply in an Optical ILA



Ejector lever


DC terminal


Each of the two 150-W power supplies has a single DC input. The power supply provides 12 VDC output with a standby voltage of 12 VDC. An optical ILA has twice the number of power supplies needed to power all the components in the device, which is known as 1+1 redundancy. When the optical ILA has both power supplies installed and connected to power, the device has full power redundancy. If a power supply fails or is removed, the other or second power supply balances the electrical load without interruption.

The fans in the power supply provide port-to-FRU airflow, which is also known as airflow out (AFO).


To avoid electrical injury, carefully follow instructions in Connecting DC Power to an Optical ILA, Installing a Power Supply in an Optical ILA, and Removing a Power Supply from an Optical ILA.


We recommend that the 48-VDC facility DC source be equipped with a circuit breaker rated at 10 A (–48 VDC) minimum, or as required by local code.