Instruction manual

1. Components Overview
5
Figure 1-6 Rear of the Switch (with a DC power supply unit installed)
NOTE
A network interface unit comes in a single-size model and a
double-size model. The NIF number when a double-size network
interface unit is installed is the number indicated by *1.
(3) Number of installed power supply units and installation location
NOTE
Power supply units come in an AC model and a DC model. Do not
install both an AC power supply unit and DC power supply unit on a
single Switch.
If you install both units, they will not operate properly.
 When installing AC power supply units
When AC power supply units are installed on a Switch, the redundancy method is
2+2 redundancy.
In this method, two basic power supply units and two additional power supply units
for redundancy are required.
For the installation locations of the power supply units, see the following table.
Table 1-2 Installation locations of AC power supply units
Basic Redundancy
Power
supply
redundancy
method
Power
supply
redundanc
y
PS1 PS2 PS3 PS4
None Y Y N N
2+2
redundancy
Required Y Y Y Y
NOTE
If you install a power supply unit in a location other than those above,
it will not operate properly.
 When installing a DC power supply unit
When installing a DC power supply unit on a Switch, the power supply redundancy
method is 1+1 redundancy.
One basic power supply unit and one power supply unit for redundancy are
required.
For the installation locations of the power supply units, see the following table.