Cisco 3550-12T Hardware Installation Guide - Page 68
Wiring the DC-Input Power Source
UPC - 746320521411
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Connecting to DC Power Appendix C DC Power Connections Wiring the DC-Input Power Source Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030 Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003 Caution You must connect the Catalyst 3550-24-DC switch only to a DC-input power source that has an input supply voltage from -36 to -72 VDC. If the supply voltage is not in this range, the switch might not operate properly or might be damaged. Caution The switch must be installed with 5 A-branch-circuit protection. Note This installation must comply with all applicable codes. 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 60530 Catalyst 3550 Multilayer Switch Hardware Installation Guide C-4 OL-6155-01