Cisco Catalyst 3550 Hardware Installation Manual page 68

Connecting to DC Power
Wiring the DC-Input Power Source
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Warning
Statement 1030
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
You must connect the Catalyst 3550-24-DC switch only to a DC-input power source that has an input
Caution
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.
The switch must be installed with 5 A-branch-circuit protection.
Caution
This installation must comply with all applicable codes.
Note
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
Catalyst 3550 Multilayer Switch Hardware Installation Guide
C-4
Terminal Block Plug
Appendix C
Figure C-4).
DC Power Connections
OL-6155-01