Since it is the ferrite that is the ‘special accessory’, the company would not
necessarily need to provide the cable, they would only have to provide the
special accessory ferrite that would fit on the cable. Or they would provide a
means of obtaining the ferrite at the time of purchase for
Hi Dennis,
If the manufacturer choose to to use ferrites to solves the emissions
problem, the implementation seems clear. Inconvenient, but clear.
What if the company found HDMI cables without ferrites that solved the
emissions problem, like cables from vendors that properly terminate the
Around1991 I was able to demonstrate that a computer that must be shipped with a really well shielded printer cable must also be shipped with really well shielded PRINTER. Luckily, I caught it before we sent it out for an FCC ID, and minor rework made the the poorly placed bypass capacitors
All,
I was looking through sales ads for electronics equipment, and saw a
Blu-Ray disc player from a major company that came with an HDMI cable.
In the past, I would have just considered this a convenience to the buyer,
like including batteries for remote controls. Now, I'm wondering if the
Pat,It is incumbent on the original manufacturer to include any information pertinent to the correct use and operation of the product. Many manufacturers have a "Conditions of Use" section in in their user manuals right behind the safety section. Of course would include any required I/O cables.
For the FCC as noted in the post, special equipment, that is the stuff needed
to pass the test, must be supplied with the equipment with instructions for
using it. For example, the ferrites originally mentioned. In the EU, this
has been held to be too complicated for the common consumer and
On 9/4/2014 4:56 PM, Ravinder Ajmani wrote:
Most of the products our lab tested were PCs (XT, AT), and peripherals
(printers, monitors, Modems, Display Adapters, etc). Printer cable was always
a key issue. We would always use Belden cables with the printers, as they were
double shielded
But John, HDMI uses a differential signalling interface which is known to
provide low emissions! 8-)
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: 04 September 2014 19:44
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] FCC EMI Test and Ferrites on
In message
cec6039c09630543852b1a8cfa0a0c790de63...@stwpiexc03.sats.corp, dated
Fri, 5 Sep 2014, Pawson, James james.paw...@echostar.com writes:
But John, HDMI uses a differential signalling interface which is known
to provide low emissions! 8-)
Oh, right. So no ferrites are actually
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
The problem with HDMI cables is that the HDMI standards for the cables do not
specify that the shields be terminated. Thus, cables with improperly
terminated shields can be labeled as HDMI compliant. Best of luck in buying
one off the shelf and having it done right from an EMC perspective.
In message
63e38a5b081437478c77651f3d56c64f580a3...@orsmsx102.amr.corp.intel.com,
dated Thu, 4 Sep 2014, Pettit, Ghery ghery.pet...@intel.com writes:
The problem with HDMI cables is that the HDMI standards for the cables
do not specify that the shields be terminated.
Is anyone complaining
A generation ago I was involved with EMI testing of computer products. Most of
the products our lab tested were PCs (XT, AT), and peripherals (printers,
monitors, Modems, Display Adapters, etc). Printer cable was always a key
issue. We would always use Belden cables with the printers, as
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