Cisco Systems C3850NM41G Finding the Power Supply Module Serial Number, 4-12, the module LEDs

Chapter 4 Power Supply Installation

Finding the Power Supply Module Serial Number

Step 3 Connect the DC-input power terminals to the terminal blocks. See Figure 4-12or Figure 4-13. Make sure to match the polarity (negative to negative, positive to positive) when connecting the wires to the terminal blocks. Connect the ground wire to a grounded metal rack or to earth ground if the switch is not in a grounded rack.

Figure 4-12 DC Source A Isolated From Source B with No Common Ground

	A+		A-	B-		B+
							253447
	+
		-		-	+
	Figure 4-13		DC Source A and Source B Connections with Common Ground
	A+		A-	B-		B+
								253446
	+			-		+
		-
Step 4	Torque all terminal block screws to 11 lbf-in.
Step 5	Replace the terminal block safety cover.
Step 6	Move the DC power source circuit-breakers to the ON position.
Step 7	Confirm that the power supply DC OK and PS OK LEDs are green. See Table 4-2for a description of
	the module LEDs.

Finding the Power Supply Module Serial Number

If you contact Cisco Technical Assistance regarding a power supply module, you need to know the serial number. See Figure 4-14to Figure 4-16to find the serial number. You can also use the CLI to find out the serial number.

	Catalyst 3850 Switch Hardware Installation Guide
4-12	OL-26779-02