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2.2.3
LOCATION
The OSD2251BP should be placed where it will not be subjected to extreme temperatures, humidity, or
electromagnetic interference. Specifically, the site selected should meet the following requirements:
•
The ambient temperature should be between -20°C to 75°C.
•
The relative humidity should be less than 95 percent, non-condensing.
•
Surrounding electrical devices should not exceed the electromagnetic field (RFC) standards.
•
Make sure that the switch receives adequate ventilation. Do not block the ventilation holes on
any side of the switch.
Note: Without proper cooling and control (lowering) of ambient temperature, the components within
the OSD2251BP can be subject to increased heat shortening the longevity and reliability. It is thus
good engineering practice to ensure the unit is installed in a well ventilated area.
2.2.4
POWER SUPPLY CONNECTIONS
The OSD2251BP requires external power to the Redundant DC Terminal Block Power Connector
located at the top of the unit. Always ensure that the power is off before any installation.
Redundant DC Terminal Block Power Inputs
There are two pairs of power inputs for use with redundant power sources. Only one power input is
required to be connected to run the switch.
Step 1: Connect the DC power to the appropriate power source, connect the plug-able terminal block
on the OSD2251BP switch and then turn power on.
Step 2: Disconnect the power if you want to shut down the switch.
External Power Pin
Power 1: +
Power 1: 0V
Power 2: +
Power 2: 0V
*
recommended for PoE+ or ≥ 55V
≥52V
DC
PAGE 11
OSD2251BP OPERATOR MANUAL
OPTICAL SYSTEMS DESIGN
TABLE 2: DC OR AC POWER CONNECTION
for 60W PoE
DC
FIGURE 4: POWER SUPPLY CONNECTIONS
Specification
46V
to 57V
@ 1.5A*
DC
DC
Ground – 0V
46V
to 57V
@ 1.5A*
DC
DC
Ground – 0V
Earth Ground Connection
DOC ID: 10119301
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