ADTRAN NetVanta 1748F Series, Hardware Installation Manual

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Unit Installation ADTRAN 1748F Switch
22 Copyright © 2016 ADTRAN, Inc. 61700558F1-34B
Table 1. Fan Tray Specifications
To replace the fan tray, follow these steps:
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.
Item Description
Power Consumption 12 VDC @ 2.8 A, 37 Watts maximum
Airflow 76.4 CFM minimum
90.4 CFM maximum
Dimensions 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
Step Action
1 Loosen the two retaining screws on the front panel of the fan tray (see Figure 8 ).
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.
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.