Specifications

36 x900 Series Switch
C613-03092-00 REV D
Approved PSUs
and FOM
Product numbers for the power supply unit (PSU) and the fan-only module
(FOM) that can be fitted in the switches are:
■ AT-PWR01(either AC or DC power supply unit)
■ AT-PWR02 (AC power supply unit only)
Excludes the AT-9924Ts and x900-24X switches
■ AT-FAN01 (fan-only module)
LEDs on the
PSU and FOM
The following table describes how LEDs on power supply units and fan-only
modules report faults and operational activities.
IPv6 Accelerator Card
An optional AT-ACC01 network processor accelerator card accelerates IPv6
unicast and multicast routing in hardware on AT-8948 and AT-9924T/4SP
models. For full functionality, 512MBytes SDRAM must be installed in the
switch.
How the card works When the switch receives an IPv6 packet to route, the packet is sent to the
network processor accelerator card. The card processes the packet and sends it
out the correct port with appropriate alterations to the packet. Other IPv6
functions are passed to software, such as routing protocol control packets,
encryption, authentication, and hop-by-hop headers.
No configuration is necessary for the accelerator card to function; the card is
enabled at installation. If you disable the card (using software), the switch
handles IPv6 routing in the software.
Use the hardware filter and QoS commands to enable Quality of Service (QoS)
functionality on the accelerator card. For information about QoS functionality
and hardware filters, see the Quality of Service and Switching chapters in the
Software Reference.
Warning Only authorised service personnel should install a network processor
accelerator card. Opening the switch’s lid may cause personal injury from
electric shock, could damage the switch, and will invalidate the product
warranty.
LED State Description
Fault Red There is either a fan failure, or the temperature has exceeded
the limit of 75ºC (167
ºF).
PWR Green A PSU is installed in the switch and is receiving power. The
FOM does not have this LED.