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Unit Installation
Item
Power Consumption
Airflow
Dimensions
To replace the fan tray, follow these steps:
Step
1
Loosen the two retaining screws on the front panel of the fan tray (see
2
Pull firmly on the screws until the fan tray is free.
3
Slide the fan tray out of the switch.
4
Insert the replacement fan tray into the slot and slide it slowly into the chassis.
5
Push firmly until the fan tray clicks into place. The fans should immediately start to operate.
6
Tighten the retaining screws to secure the fan tray in the chassis.
Supplying Power to the Unit
This chapter focuses on the switch power supplies, how to install them, and how to power-on the switch.
Connecting the switch to ground is also covered.
This section includes these sections:
•
Power Supply Modules on page 22
•
Grounding the Chassis on page 23
•
Connecting to AC Power on page 24
Power Supply Modules
The switch supports hot-swappable power supply units (PSUs). You can install up to two PSUs with matching
airflow direction in the switch. The PSUs operate in a load-sharing mode and provide 1+1 redundancy.
1+1 redundancy is a system where a switch power supply is backed up by another switch
power supply in a load-sharing mode. If one power supply fails, the other power supply
takes over the full load of the switch.
The switch includes plug-in power supply and fan tray modules that are installed into its
chassis. All installed modules must have a matching airflow direction. That is, all modules
must have a front-to-back (F2B) airflow direction, or all modules must have a
back-to-front (B2F) airflow direction. The airflow direction of PSUs and fan trays is
indicated by labels on the modules.
22
Table 1. Fan Tray Specifications
12 VDC @ 2.8 A, 37 Watts maximum
76.4 CFM minimum
90.4 CFM maximum
207mm W x 94.25 mm D x 40.4 mm H
(8.15 inch W x 3.71 inch D x 1.59 inch H)
Replacing the Fan Tray
Action
Copyright © 2016 ADTRAN, Inc.
ADTRAN 1748F Switch
Description
Figure
8).
61700558F1-34B
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