Avaya 5900 Series Installation Job Aid page 4

Installing the fan trays and power supply
Your switch supports a combination of field-replaceable power supplies and cooling fan trays. Two
fan trays are included with your switch. You must install the two fan trays and at least one power
supply before using the switch. The switch supports an optional second power supply for
redundancy and load sharing.
To install the fan trays and power supplies to your switch, use the following procedure.
Important:
Supported cooling airflow directions are: front to back or back to front. The airflow direction of
fan trays and power supplies are labelled and fixed. Ensure the fan trays and power supplies
have the same direction of airflow.
The fan trays and power supplies do not support the ability to change their airflow direction. The
first power supply determines the airflow direction.
In a single power supply installation, keep the blanking plate installed over the unused power
supply slot for proper cooling. Avaya recommends you use PS 1 (the left most power supply slot
when viewed from the front) in a single power supply installation.
Before you begin
Verify that the fan trays and power supply are compatible—ensure that the airflow direction for all
fans and power supplies match.
Procedure
1. Insert each fan tray into a rear fan tray slot.
2. Verify that each fan tray is fully seated in the slot and secure each fan tray with two thumb
screws.
3. Insert each power supply into a rear power supply slot.
If a blanking plate covers the required power-supply slot, remove the plate before inserting
the power supply.
4. Verify that each power supply is fully seated in the slot and securely clipped in place.
Example
The following figure shows how to properly insert the cooling fan trays and power supplies into your
switch.
November 2014 Installation Job Aid (English) for Avaya ERS 5900 Series (NN47211-301, ver 01.04)
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