Power Supply Air Flow And Switch Fan Module Air Flow; Switch Fan Module Air Flow Direction; Power Supply Air Flow Based On Model Number - Enterasys S Series Hardware Installation Manual

Mounting the SSA Switch

Power Supply Air Flow and Switch Fan Module Air Flow

The power supply module has its own fan for cooling the power supply, and the two switch fan
modules have two fans (each) for cooling the switch circuitry. The air flow direction of all three
modules must agree in order to properly cool the installed SSA system. In rack mount
configurations it is best practice to mount all devices with a common cool air side and a common
exhaust (hot air) side.
On the SSA switch, two air flow directions are supported:
• The I/O port side to the power supply side
• The power supply side to the I/O port side
The SSA switch is shipped from the factory set up for air flow direction from the I/O port side to
the power supply side device. If your installation requires that air flow direction be from the
power supply side to the I/O port side, you must reverse the air flow of the switch fan module fans
(see "Reversing the Fan Module Air
flanges (ears) (see
You can determine air flow direction of the switch fan modules by visually inspecting them for
whether a white label or a fan blade is visible through the fan screen. Before securing the SSA
switch to the rack or installing the power supply into the SSA switch, perform a visual verification
that both power supply module and switch fan module air flow agree with the intended
configuration as defined in
Unpack each power supply you ordered for the SSA switch (See
on page 2-11).
Table 2-2 Switch Fan Module Air Flow Direction
Air Flow Direction
From I/O port side to power supply side
From power supply side to I/O port side
The power supply air flow direction can also be verified based upon the power supply
manufacturer's part number located on the power supply bottom label.
Table 2-3 Power Supply Air Flow Based on Model Number
Model Number
SSA-FB-AC-PS-A
SSA-FB-AC-PS-B
2-4 Installation
Note: The power suppl(ies) must be ordered separately from the switch unit, and air flow direction
must be specified when ordering them. Power supply air flow direction is fixed and cannot be
manually changed. If the ordered power supply has an air flow direction that does not work for your
rack configuration, you must re-order the power supply that has the correct air flow direction (see
Table 2-3).
"Rack Mount Ear
Table 2-2
Mfg. Part Number
DS460S-3-003
DS460S-3-002
Flow" on page 2-5). Also, you must reverse the rack mount
Positioning" on page 2-6).
and Table 2-3.
Visual Indication
White label is visible on fan unit
Fan blade is visible on fan unit
Air Flow Direction
From power supply side to I/O port side
From I/O port side to power supply side
"Unpacking the Power Supplies"