IFS ES2001-4P-4T User Manual
17
Power Sourcing
Equipment
(PSE)
Powered
Device (PD)
DC/DC
Converter
Spare Pair
Figure 1 - Power Supplied over the Spare Pins
The data pairs are used. Since Ethernet pairs are transformer coupled at each end, it is possible to apply DC power
to the center tap of the isolation transformer without upsetting the data transfer. In this mode of operation the pair on
pins 3 and 6 and the pair on pins 1 and 2 can be of either polarity.
Power Sourcing
Equipment
(PSE)
Powered
Device (PD)
DC/DC
Converter
Spare Pair
Figure 2 - Power Supplied over the Data Pins
When to install PoE?
Consider the following scenarios:
•
You're planning to install the latest VoIP Phone system to minimize cabling building costs when your
company moves into new offices next month.
•
The company staff has been clamoring for a wireless access point in the picnic area behind the building so
they can work on their laptops through lunch, but the cost of electrical power to the outside is not affordable.
