3com 7754 User Manual

C

HAPTER

 2: I

NSTALLING

 T

HE

 S

WITCH

 7750

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.

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.

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 detailed instructions on how to install the PoE rack, see the Switch 7750 PoE 
Rack Installation Guide.