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I agree that P802.3at should send a liaison letter to TIA regarding TSB-184 regarding the technical changes in the default ballot to section 5 cabling selection (copied below). +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Technical change
in default ballot: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Changed from: Remote
powering should be implemented using 4-pair
balanced To: Remote powering
should be implemented using category 5e or ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The new language can be easily interpreted as a conflict between TIA-184 and 802.3at as it states "how remote powering should be implemented'. The previous TSB-184 text also included suggestions on remote powering implementation but was less objectionable as it aligned with 802.3at.
Recommendation to include in liaison:
TSB-184 states "...It is intended to guide new installations and renovations."; this statement is buried in the introduction. Therefore, I'd advise the following change to TSB-184 be requested in the liaison letter to avoid ambiguity and potential conflicts between 802.3at and TSB-184.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Change from: Remote
powering should be implemented using category 5e or To: When planning new
installations delivering SELV power,
Category 5e or ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Regards,
Chris DiMinico MC Communications
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