Playing the devil advocate here only because I find this interesting and I'm
not advocating anything. Heck I'm probably just arguing for argument sake.
If all cables are not equal as Ghery and note and the designer/manufacturer
has knowledge of that don't the cables then become special accessories in their
own right? Under 15.27 c) They would not normally be considered special
accessory items under the definition because they can be easily purchased at a
multitude of locations.
15.27 c) Accessory items that can be readily obtained from multiple
retail outlets are NOT (my emphasis) considered to be special accessories ...
But given the knowledge of the designer/manufacturer that cables vary in
performance and not all cables were tested the only assurance they have that
the system will perform as intended is buy telling the consumer exactly which
cable they must use buy name and brand. But if they do that then the cable
isn't "readily obtained from multiple outlets" and is now by definition a
special accessory. Paragraph 15.27 says that "The party responsible for the
equipment, as detailed in ยง2.909 of this chapter, shall ensure that these
special accessories are provided with the equipment" So now must the cable be
provided?
Gmac
-----Original Message-----
From: Pettit, Ghery [mailto:ghery.pet...@intel.com]
Sent: Thursday, September 04, 2014 12:46 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] FCC EMI Test and Ferrites on Cables
You are highly unlikely to find the ferrite prayer beads at Best Buy. If you
don't specify which ones to get you have no idea what the result will be. I
think you are correct, the beads must be shipped with the product. The right
ones, to boot.
Now, how does the designer know that he needs ferrite beads? My experience has
been that many (most?) HDMI cables do not have their shields terminated
properly, if at all. Once the shields are terminated correctly problems go
away. Could this be a better solution?
Ghery S. Pettit
-
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