Instruction manual

1. Components Overview

1.4 External power unit (EPU)

Connected via the special accessory cable, the external power unit (EPU) supplies

stand-by power to the main device of AX2400S and AX3600S series switches to configure

power redundancy, which allows continuous operation of the device without interruptions,

even if a failure occurs within the internal power unit. There are two types of EPUs:

EPU-A for AC models and EPU-B for AC (PoE) models. Available combination of the main

devices, EPUs and power supply modules are shown in Table 1-34 Compatibility of main

devices with external power units (EPUs) and power supply modules.

EPUs contain power supply modules. One power supply module can serve as the

stand-by power supply unit for one switch. By adding power supply modules to an EPU,

standby power can be supplied to up to four switches (EPU-A) (or two switches (EPU-B)).

Table 1-34 Compatibility of main devices with external power units (EPUs) and power

supply modules

Main Device

Compatible EPU

Compatible power

supply module

Power supply type

Model name

AC model

AX2430S-24T

AX2430S-24T2X

AX2430S-48T

AX2430S-48T2X

AX3630S-24T

AX3630S-24T2X

AX3640S-24T

EPU-A

EPU-AM

AC (PoE) model

AX3630S-24P

EPU-B

EPU-BM

1.4.1 EPU-A

External power units for AC models are described below.

EPU-A has the following hardware specifications:

 Power supply module slots: 4

 Power supply module (EPU-AM): 1

NOTE

The EPU has one power supply module in slot 1. Blank panels over the other slots

when shipped.