OPTICAL SYSTEMS DESIGN
DOC ID: 10116503
OSD2154P OPERATOR MANUAL
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2.3
OSD2154P SINGLE/DUAL SIGNATURE PD OPERATION
The OSD2154P can optionally support single, dual or either single/dual signature PD. This must be
specified at time of sale. By default, dual signature PD is available on the front panel if a single and
dual signature unit (option SD) is ordered.
2.3.1
SINGLE SIGNATURE PD
A “single signature PD” shares the same detection signature, classification signature, and maintains
power signature between both pair sets.
FIGURE 11: SINGLE SIGNATURE PD
2.3.2
DUAL SIGNATURE PD
A “dual signature PD” has independent detection signatures, classification signatures, and maintains
power signatures on each pair set. It enables the load to work with two pair PSEs eg. A surveillance
camera built with dual signature PD can have one pair connected to the camera and the other pair to a
fan or heater. Note that dual signature PDs require two parallel PD interfaces, one for each pair set,
where the power from the two PSEs are summed after each PD interface ie Camera (25W) + fan (10W)
= 35W from one port.
FIGURE 12: DUAL SIGNATURE PD
