Specifications

Hardware Reference 33
Software Release 3.0.2
C613-03092-00 REV C
Power Supply Units (PSUs)
Two power supply bays are at the rear of the AT-8900, AT-9900, and AT-9900s
chassis. Each switch is supplied with a single power supply unit (PSU), either
AC or DC. Depending on the model, the switch has either a fan-only module
(FOM) or a blanking panel:
■ The AT-8948, AT-9924T/4SP, and AT-9924Ts switches have a PSU and a
FOM installed.
■ The AT-9924T and AT-9924SP switches have a PSU and a blanking panel
installed. When there is just one PSU, it must be in Bay 2 for optimised
cooling.
The following figure shows the rear view of the AT-8948, AT-9924T/4SP, and
AT-9924Ts models.
PSU and FOM installed
A second PSU is available as an option and provides redundancy. When two
are fitted, they must be the same type of current, either AC or DC.
Each PSU and FOM contains an EPROM chip that contains information, such
as the type of module, serial number, and revision of the PSU. This information
is available through the command line interface (CLI).
How to install a PSU or FOM in the switch is described in the Removable Power
Supply and Fan Installation Guide.
Hardware overview ■ Power supply units (PSUs) are hot-swappable and load share
■ Dimensions
• Height: 40.9 mm
• Width: 193mm
• Depth: 130 mm
■ AC models
• Universal 100/240 VAC 47/63Hz input
• Maximum continuous current draw: 2.2A at 100V, 1.1 A at 230V
• Maximum inrush current (cold start at 25ºC/77ºF): 70A at 240V, 32A at
115 V
Caution Double pole/neutral fusing. The fuse rating for FH101 and FH102
is 250V, 5A (AT-PWR01).
■ DC models
• 40 to 60V, 48V nominal
• Supports either positive grounded or negative grounded operation
• Maximum continuous current draw: 3.9 A at 40V
• Maximum standby current: 100mA
•Run/Standby switch
CAUTION: DISCONNECT POWER CORD PRIOR TO REMOVAL OF PSU
CAUTION: DISCONNECT ALL POWER CORDS TO DISABLE SYSTEM POWER
AC INPUT
100-240V
50/6 0Hz
3.0A
PWR
GOOD
FAULT
AT-PWR01
AT-FAN01
FAULT