OPTICAL SYSTEMS DESIGN
DOC ID: 10119601
OSD2184P OPERATOR MANUAL
PAGE 20
2.3
SINGLE/DUAL SIGNATURE PD OPERATION
The OSD2184P supports single, dual or either single/dual signature PD by automatically detecting the
user PD signature.
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