3com 7754 用户手册
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C
HAPTER
2: I
NSTALLING
T
HE
S
WITCH
7750
Connecting the PoE
Power Cord
Follow these steps to connect the power cord from the PoE rack:
1 Loosen the mounting screw of the PoE terminal block on the rear panel of the
switch.
2 Insert the -48V OT terminal of the DC power cord to the NEG (-) terminal of the
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal
of the external PoE power supply. See Figure 34 for a detailed view.
of the external PoE power supply. See Figure 34 for a detailed view.
Figure 34 Back of the PoE Rack
1 PoE external power input: NEG (-)
2 (+) PoE external power input: NEG (+)
3 COM port (external power monitor)
3 Insert the GND OT terminal of the DC power cord to the RTN (+) terminal of the
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal
of the site power.
of the site power.
Figure 35 Front Panel of the PoE Rack
1 AC input socket
2 DC output terminal: NEG (-)
3 DC output terminal: RTN (+)
4 RS232 serial port
4 Insert the PGND OT terminal of the DC power cord to the grounding screw of the
switch and fasten the mounting screw; insert the other end to the grounding bar
for the switch.
for the switch.
For detailed instructions on how to install the PoE rack, see the Switch 7750 PoE
Rack Installation Guide.
Rack Installation Guide.