Chapter 5: PSU Replacement
The NetWall 6000 Series can be fitted with dual hot-swappable
Power Supply Units
(PSUs), both of
which are capable of acting as a sole power supply for the appliance and which, together,
provide redundancy against PSU failure. There is one type of PSU for AC power and another for
DC power.
Figure 5.1. A NetWall 6000 Series PSU (AC Power)
As standard, the NetWall 6000 Series is delivered with only a single PSU fitted and the second
PSU slot is occupied by a dummy slot filler which suppresses the second slot's failure alarm.
A
second PSU must be ordered as a separate item if it is required.
The NetWall 6000 Series is
capable of operating with only one PSU fitted but that provides no redundancy.
A second PSU is fitted into the second PSU slot after taking out the dummy slot filler. Each PSU
module is secured by a lock which is internal to the PSU and this is opened with a black sliding
locking lever. There is also a silver metal hinged retaining bracket on each PSU which is used for
preventing the power cable from pulling out.
With two PSUs installed, only one of the PSUs is active and supplying power. If the active PSU
fails then the other PSU will become active with no disruption to traffic throughput. The failed
PSU can then be replaced with a new PSU and this can be done while the NetWall 6000 Series is
processing live traffic.
Symptoms of PSU Failure
If two PSUs are fitted to provide redundancy and there is a single PSU failure, an audible alarm
will be heard coming from the appliance. This alarm can be switched off by pressing the red
button located to the right of the PSUs. This is shown in the image shown below.
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