Cisco ISA 3000 Connecting Instructions page 4

Connecting to DC Power
Warning
Warning
Warning
Warning
You connect DC power to the device through the front panel connectors. The device has a dual-feed DC power
supply; two connectors provide primary and secondary DC power (DC-A and DC-B).
Each power connector has an LED status indicator. The device power connectors are attached to the device
chassis. Each power connector has screw terminals for terminating the DC power. All connectors are attached
to the device front panel with the provided captive screws.
The power connector labeling is on the panel. The positive DC power connection is labeled "+", and the return
connection is labeled "–".
The device can operate with a single power source or with dual power sources. When both power sources are
operational, the device draws power from the DC source with the higher voltage. If one of the two power
sources fail, the other continues to power the device.
To connect DC power to your Cisco ISA 3000, follow these steps:
Step 1 Locate the two power connectors on the device front panel labeled DC-A and DC-B.
Figure 3: Power Connector
Step 2 Identify the connector positive and return DC power connections. The "+" is the Positive DC power connection, and the
"-" is the Return DC power connection.
Step 3
Measure two strands of twisted-pair copper wire long enough to connect the power converter to the DC power source.
For DC connections from the power converter to the DC source, use 18 to 20 AWG (2.6mm) twisted-pair copper wire.
Connecting the Cisco ISA 3000
4
Installation of the equipment must comply with local and national electrical codes. Statement 1074
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement
1022
Connecting the Cisco ISA 3000