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 146: 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 Connecting
Network Interface Cables on page 220.
Install a 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 dierent wattages in the same switch.
To install a Summit 550 W DC power supply, refer to the following sections as needed:
1 Make sure you have the tools and materials you need.
See Required Tools and Materials for Installing a 550 W DC Power Supply on page 195.
Installing Your Extreme Networks Switch
ExtremeSwitching and Summit Switches: Hardware Installation Guide 194
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