Power Supply Air Flow And Switch Fan Module Air Flow; Switch Fan Module Air Flow Direction - Enterasys 7100G Series Hardware Installation Manual

Mounting the 7100G-Series 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 switch fan
module has four fans for cooling the switch circuitry. The air flow direction of both the power
supply and fan modules must agree in order to properly cool the installed 7100G-Series 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 7100-Series switch, air flow direction can be from either:
• The power supply side to the switch I/O port side
• The switch I/O port side to the power supply side
The 7100-Series switch is shipped from the factory set up for air flow direction from the power
supply side to the switch I/O port side of the device. If your installation requires that air flow
direction be from the I/O port side to the power supply side, you will need to reverse the air flow
of the switch fan module fans (see
rack mount flanges (ears) need to be reversed (see
Air flow direction of the switch fan modules can be determined by visually inspecting them for
whether a white label or a fan blade is visible through the fan screen. Before securing the
7100G-Series switch to the rack or installing the power supply into the 7100G-Series 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 7100G-Series switch (See
Supplies" on page 2-12).
Table 2-2 Switch Fan Module Air Flow Direction
Air Flow Direction
From power supply side to switch I/O port side
From switch I/O port side to power supply side
For the non-PoE power supplies, 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
and the airflow direction indicator on the serial number label located on the lower right edge of
the regulatory label. The PoE power supplies are labeled with the model number and an air flow
arrow indicating unit air flow direction on the power supply bottom label.
Table 2-3 71A-PS-A/B Power Supply Air Flow Based on Model Number
Model Number
71A-PS-A
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 can not 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).
Mfg. Part Number
DS460S-3-003
"Reversing the Fan Module Air
"Rack Mount Ear
Table 2-2
Visual Indication
Fan blade is visible on fan unit
White label is visible on fan unit
Air Flow Direction
From power supply side to
switch I/O port side
Flow" on page 2-5). Also, the
Positioning" on page 2-7).
and Table 2-3.
"Unpacking the Power
Serial Number Label