Installation guide

Appendix C DC Power Connections
Connecting to DC Power
C-6
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-06
To wire the switch to a DC-input power source, follow these steps:
Step 1 Locate and remove the terminal block plug (see Figure C-4).
Figure C-4 Terminal Block Plug
Step 2
Identify the positive and negative feed positions for the terminal block
connection. The wiring sequence is positive to positive and negative to negative
for both the A and the B feed wires. The switch rear panel identifies the positive
and negative positions for both the A and B feed wires, as shown in Figure C-5.
Figure C-5 Positive and Negative Positions on the Switch Rear Panel
60530
74626
INPUT
-36 -
-72 V
CURRENT: 2 - 1A
A
B