c. Slide the spade terminal of the positive wire (–48 V RTN) under the captive square washer on the
positive terminal (labeled RTN).
d. Tighten both screws on the terminal block to 11 in
‑
lb (1.25 N m).
Figure 181: Tightening Terminal Screws (Connecting to a –48 V Source)
5. Slide the cover into place over the terminal block.
6. Connect the cables to the DC source voltage, using hardware appropriate to the installation site and
following local and national electrical codes.
7. Energize the DC circuit.
Leave the ESD strap permanently connected to the rack, so that the strap is always available when you
need to handle ESD-sensitive components.
You can now connect network interface cables to the switch, using the instructions in
Install a 450 W or 550 W Internal DC Power Supply
Summit 550 W power supply units (PSUs) are available with either front-to-back or back-to-front
airflow. If you install two PSUs, both must have the same airflow direction.
Note
You cannot combine power supplies of different wattages in the same switch.
To install a Summit 450 W or 550 W DC power supply, refer to the following sections as needed:
1. Make sure you have the tools and materials you need.
Required Tools and Materials for Installing a 450 W or 550 W DC Power Supply
on page 235.
2. Prepare the power cables and ground cable by attaching the provided connection lugs to the cables.
Preparing the Cables for a 450 W or 550 W DC Power Supply
3. Insert the power supply into the switch.
Installing a 450 W or 550 W DC Power Supply
Install a 450 W or 550 W Internal DC Power Supply
Installing Your Extreme Networks Switch
234 ExtremeSwitching Hardware Installation Guide
