C-6
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
OL-7677-02
Appendix C Connecting to DC Power
Wiring the DC-Input Power Source
Caution The Cisco ME-3400G-12CS-DC switch has two DC power supplies. They are labelled PS1 and PS2, and
each power supply has an A and B input. When connecting power to both PS 1 and PS 2, connect only
a single input (A or B) to each power supply).
To wire the switch to a DC-input power source, follow these steps:
Step 1 To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit,
switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the
OFF position.
Step 2 Locate the terminal block plug (see Figure C-6).
Figure C-6 Terminal Block Plug
Step 3 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 front panel of the switch identifies the positive and negative positions for both the A and B feed
wires (See Figure C-7.)
Figure C-7 Positive and Negative Positions
Figure C-7 shows a Cisco ME-3400-24TS-DC. The ME-3400G-12CS-DC switch has two DC power
supplies (labelled PS 1 and PS 2). Each power supply has two inputs (labelled A and B). When
connecting an input to both PS 1 and PS 2, only a single input (A or B) should be connected to each
power supply.
60530
CONSOLE
132858
SYSTEM
INPUT -36 – -72 V
CURRENT 2 – 1A
A
B
+
+
SYSTEM
