Allied Telesis AT-9000/28POE, AT-9000/12POE manual Power Connectors
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Chapter 1: Overview
Power Connectors
The AT-9000/12POE,AT-9000/28,AT-9000/28SP, and AT-9000/52 switches have one AC power supply socket on the back panel. The AT-9000/28POE switch has two AC power supply sockets.
AC switches are powered on or off by connecting or disconnecting the power cords.