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Help CenterPOE Power Detect (PD) Module
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Specifications
The Ag9400 series of modules are conforming to the IEEE 802.3af Power-over-Ethernet (PoE) standard.The Ag9400 signature and control circuit provides the PoE compatibility signature and power classification required by the Power Sourcing Equipment (PSE) before applying up to 15W power to the port. The Ag9400 provides a Class 0 signature.
The DC/DC converter operates over a wide input voltage range and provides a regulated output. The DC/DC converter also has built-in short-circuit output protection.
PD Signature
When the Ag9400 is connected to the Cat 5e cable, it will automatically present a Powered Device (PD) signature to the Power Sourcing Equipment (PSE) or Midspan Equipment, when requested. The equipment will then recognise that a powered device is connected to that line and supply power.
Isolation
To meet the safety isolation requirements of IEEE802.3af section 33.4.1 a Powered Device (PD) must pass the electrical strength test of IEC 60950 sub clause 6.2. This calls for either a) 1500Vac test or b) 1500V impulse test. The Ag9400 is specified to meet the 1500Vdc impulse test. It is also important that the tracks on either side of the isolation barrier have at least a 3mm clearance, see Figures 7 & 8 and Section 11 for more information.
Power Classification
The Ag9400 is fixed for Class 0 (0.44 Watts to 12.95 Watts) operation. Should Class programming be required refer to other Silvertel POE products such as the Ag9200.
DC/DC Converter
The Ag9400’s DC/DC converter provides a regulated low ripple and low noise output that has built-in short-circuit output protection – refer Table 1: Ordering information for voltage and power ratings
Output Adjustment
The Ag9400 has an ADJ pin, which allows the output voltage to be increased or decreased from its nominal value. Figure 4: Output Adjustment shows how the ADJ pin is connected.
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