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PMP20220: compatibility with IEEE 802.3af and IEEE 802.3at

Guru 14805 points
Part Number: PMP20220

Is this reference design (pmp20220) compatible with both IEEE 802.3af (POE) and IEEE 802.3at(POE+) ??

  • PMP20220 is a Type 2, Class 4 PoE PD per IEEE802.3at with the input power limited to 25.5W.  The 802.3at specification supersedes the IEEE802.3af specification and contains the requirements for both Type 1, Class 1-3 (802.3af) and Type 2, Class 4 PoE PSEs/PDs.

    PMP20220 can operate from a Type 1 (af) PSE, but the input power will be limited to 13W.

    Note, the new IEEE802.3bt specification that will be release later this year contains the PSE/PD requirements for Type 1 (af), Type 2 (at), and the new Type 3, Class 5-6 and Type 4, Class 7-8.  Class 8 will allow a maximum of 90W at the PSE output and 71W at the PD input.