Instruction manual

1. Components Overview
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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 series 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 power models and EPU-B for AC (PoE) models. Available combination
of the main devices, EPUs and power supply modules are shown in Table 1-25 Compatibility of Main Devices with
External Power Units (EPU) and Power Supply Modules
EPUs contain power supply modules. One power supply module can serve as the stand-by power supply 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 1-25 Compatibility of Main Devices with External Power Units (EPUs) and Power Supply Modules
1.4.1 EPU-A
External power units for AC power models are described below.
EPU-A has the following hardware specifications:
• Power supply module slots: 4
• Power supply module (EPU-AM): 1
Main device
Compatible EPU
Compatible power supply
module
Power supply type Model name
AC power model AX2430S-24T
AX2430S-24T2X
AX2430S-48T
AX2430S-48T2X
AX3630S-24T
AX3630S-24T2X
EPU-A EPU-AM
AC power (PoE) model AX3630S-24P EPU-B EPU-BM
The EPU has one power supply module in slot 1 and blank panels over the other slots when
shipped.