User's Manual

1027145–0001 Revision D 6–16 Installing indoor hub equipment Hub installation
Figure 6-11 shows an IDU chassis with a dc power supply.
A power cable is not supplied with the dc IDU chassis because
cable requirements vary, depending on where the chassis will be
used.
The power input requirement for the dc power supply (and dc
portion of the dual ac or dc power supply) is –42 to –56 Vdc.
hb050
DC power supply
Figure 6-11 DC power supply
Label on dc power supply
A label on the dc power supply advises:
CAUTION
THIS EQUIPMENT HAS A
CONNECTION BETWEEN
THE EARTHED CONDUCTOR
OF THE D.C. SUPPLY CIRCUIT
AND THE EARTHING CONDUCTOR.
SEE EARTHING INSTRUCTIONS
To disconnect dc power, unplug the terminal block (shown on
page 6–19). Do not remove the wires from the terminal block
while it is plugged in. If you do, the IDU chassis will not be
grounded.
DC power supply