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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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How Far Will a Given PD Operate?
We can ask the reverse question: we have a certain PD with a certain requirement in terms of watts. How much distance can we operate it at using a one-pair configuration, with AWG 24 or AWG 26? We provide these “constant power” design curves in Figs. 13.13 and 13.14. Note that we have taken the basic resistance values calculated in the first sections of this chapter, rather than buttressing those with connector and patch cord resistances. Also, these are purely theoretical curves which still do not tell us what the required current is (whether it is “safe” or not) and what the voltage at the PD end is. Once we fix a point, however, we can easily work all that out as described in this chapter, and ascertain its ...

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