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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Future Innovation
Just as we thought we had figured it all out, we come across Fig. 13.20, a development based on the phantom circuit principle we introduced in Chap. 1. It is a DSL-based idea from 2-Wire Inc. (US Patent Number 7190716, inventors Andrew Norrell and others). Note that an additional phantom-data channel has been created on two twisted pairs. PoE can be injected with a combination of inductor-feeding (as in one-pair PoE) and the usual center-tapping method. This can also be extended to four PoE, providing six (not four) data channels.
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FIGURE 13.20   A phantom inside a phantom (and with PoE).
Future innovation will draw on ...

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