Re: [10GBT] Request for Cat6 Emissions Characteristics
Glenn,
You are adding these peaky bumps in the PSD to the data "average".
Sailesh.
>From: Glenn Golden <gdg@zplane.com>
>Reply-To: gdg@zplane.com
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: Re: [10GBT] Request for Cat6 Emissions Characteristics
>Date: Sat, 24 Jul 2004 08:48:00 -0600
>
>sailesh rao writes:
> >
> > Frankly, I think you are being too cavalier about the peaky PSDs in the
> > PAM12 proposal in the 200MHz-300MHz frequency range. Given the peaky
>PSDs
> > at the start of each frame in your proposal (i.e., once every 52,833
>bits),
> > I'm afraid that at 10Gb/s these peaks occur often enough for the FCC to
> > become very interested in them.
> >
>
>On slide 26 of tellado_1_0704.pdf (plot attached), which shows the proposed
>frame alignment symbols, there is a light blue line which may be a little
>difficult to make out (it's around -82 dB) but it shows the average data
>symbol power. The peaks you are referring to are around 20 dB below this.
>I don't think the FCC would be interested in them.
>
>If you're concerned about the rep rate, it's below 1 MHz (1e10/52833 ~=
>1.9e5).
>
> >
> > If you now think that you will "scramble the frame start bits", may I
>ask
> > why you didin't think of this scrambling last month? It is blatant
>omissions
> > like these that can sink a standard.
> >
>
>Since the FAS peaks are more than 20 dB below the average signal power,
>it probably isn't necessary to scramble them.
>
>But I agree that whether the standard sinks or swims will relate to how
>carefully we all do our work.
>
>
>Glenn Golden
>Principal Engineer
>Teranetics, Inc.
>ggolden@teranetics.com
>
>
><< slide26.gif >>
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