|Thread Links||Date Links|
|Thread Prev||Thread Next||Thread Index||Date Prev||Date Next||Date Index|
First off, you should purchase the latest Draft, D4.2. It references EN60950-1:2001, although only to supply the definition of Limited Power Source, and test methodologies for determining isolation voltages. P802.3af is not a product safety specification. Many 802.3af products may not be, for example, ITE equipment, but may fall under other safety standards such as UL508 for industrial controls.
If you do not have a copy of the full 802.3-2002 standard, it may be downloaded free of charge from the IEEE SA website at: http://www.standards.ieee.org/getieee802/
You should read this to understand the way isolation is specified in 802.3 if the terms Environment A and Environment B are unfamiliar. P802.3af does not address any of the issues you cite in your item 2, since these are beyond the scope of the draft. P802.3af does not address the primary power supply, only the output characteristics of the PSE. Primary power and applications space are implementation specific, and you must determine which elements of EN60950 apply to your application. Language within 802.3af makes it clear that products must comply with all local and national codes that are applicable to the product, and that such compliance is beyond the scope of the draft.
The 802.3af draft gives the PD designer the information necessary create the interface to a PSE. Any other issues are implementation-specific and out of scope.
Steven B. Carlson