How is the Terminal Interrogation Performed?
A PowerDsine Power-Hub interrogates the terminal by putting a constant voltage, current limited source on the wire pairs that are to be powered. A particular capacitive detection circuit is usually designed into equipment that is “Power Enabled”. This circuitry returns the voltage in a certain manner that is analyzed by the Power-Hub microprocessor. Only if there is a recognized characteristic, will the Power-Hub inject Power down the line to the Terminal. Most Terminal units can be powered with a PowerDsine Power-Hub, even if they have not been specifically designed Power Enabled. As a minimum an external splitter can be utilized. The user should be in contact with PowerDsine in order to certify the Terminal Power Enabled. The interrogation process takes very short period of time, depending on the identification characteristics of the Terminal connected. It is repeated at regular intervals on each un-powered port. If a terminal is removed the channel will power down. PowerDsine advoca
