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Part 4: Connect Power to the Switch

 

Depending on the model of your switch, you can use either AC or DC power supplies. The power supplies are installed in the slots on the rear panel.

Before you connect power to the switch, wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.

To connect power to an AC-powered switch (see Figure 15 and Figure 16):

  1. Push the end of the retainer strip into the hole next to the inlet on the power supply faceplate until it snaps into place.
  2. Press the tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the power cord coupler into the inlet.
  3. Insert the power cord coupler firmly into the inlet.
  4. Slide the loop toward the power supply until it is snug against the base of the coupler.
  5. Press the tab on the loop, and draw out the loop into a tight circle.
  6. Insert the power cord plug into the power source outlet.
  7. Verify that the IN OK and the OUT OK LEDs on the power supply are lit green and on steadily.
    Figure 15: Connecting Power to an AC-Powered QFX5120-48Y Switch
    Connecting
Power to an AC-Powered QFX5120-48Y Switch
      1
    Retainer tab loop
     
    Figure 16: Connecting Power to an AC-Powered QFX5120-32C Switch
    Connecting
Power to an AC-Powered QFX5120-32C Switch

To connect power to a DC-powered switch (see Figure 17):

The DC power supply has four terminals labeled V-, V-, V+, and V+ for connecting DC power source cables labeled positive (+) and negative (–).

Warning

Ensure that the input circuit breaker is open so that the cable leads do not become active while you are connecting DC power.

Caution

Before you close the input breaker, install the power supply, and then connect the DC power source cables.

  1. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the terminal block.
  2. Remove the screws on the terminals by using the screwdriver. Save the screws.
  3. Connect each power supply to a power source. Secure the power source cables to the power supplies by screwing the ring lugs that are attached to the cables to the appropriate terminals by using the screws from the terminals.

    1. Secure the ring lug of the positive (+) DC power source cable to the V+ terminal on the DC power supply.
    2. Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC power supply.
    3. Tighten the screws on the power supply terminals by using an appropriate screwdriver. Do not overtighten—apply between 5 lb-in. (0.56 Nm) and 6 lb-in. (0.68 Nm) of torque to the screws.
  4. Replace the terminal block cover.
  5. Close the input circuit breaker.
  6. Verify that the IN OK and the OUT OK LEDs on the power supply are lit green and are on steadily.
    Figure 17: Connecting Power to a DC-Powered QFX5120-48Y Switch
    Connecting
Power to a DC-Powered QFX5120-48Y Switch