Optical ILA AC Power Supply Description

The AC power supplies in the optical ILA (see Figure 2) are hot-removable and hot-insertable field-replaceable units (FRUs) that you can install without powering off the optical ILA or disrupting the optical ILA function. The optical ILA has two AC power supplies. Both the power supplies are initially installed at the factory. See Figure 1 for the power numbering scheme, the power supply number is located on the top-side of the chassis.

Figure 1: Power Supply Numbering

Figure 2: AC Power Supply in an Optical ILA

1 — Power cord retainer	3 — plug power connector
2 — Handle	4 — Ejector lever

Each of the 150-W power supplies has a single AC 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, another power supply balances the electrical load without interruption.

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