RE: Doing Nothing About Anything?
Oops. Yes, that is 2mH.
> -----Original Message-----
> From: R karam [mailto:rkaram@xxxxxxxxx]
> Sent: Thursday, February 01, 2001 6:43 PM
> To: DOVE,DANIEL J (HP-Roseville,ex1); stds-802-3-pwrviamdi@xxxxxxxx
> Subject: RE: Doing Nothing About Anything?
>
>
> Hi Dan
>
> I will not have a full 3 weeks to do all the measurements
> that I did on the
> signal pair, but will try to do the basic ones to see it the
> Mid-Span is
> feasible. have not seen parts from Hank yet, and would the
> 20uh inductance
> in parallel with the 1000BT magnetic affect the 1000BT?
> unless you meant 2mh?
>
> Also Please see if the PHY vendors are willing to do the
> full suite of tests.
> are the capacitances speced at 1% what is the easiest way to
> get them?
> roger
>
>
>
>
> At 04:58 PM 2/1/01 -0800, DOVE,DANIEL J (HP-Roseville,ex1) wrote:
> >Hi Roger,
> >
> >You may have already received a package from the generous
> Mr. Hank Hinrichs
> >who indicated to me that he is going to be providing a set
> >of inductors to various members of this committee that can be used
> >to inject power into a mid-span connection that should support
> >1000BASE-T operation.
> >
> >I know that you would like to see 1000BASE-T supported, and I would
> >like to see mid-span, so perhaps we can both perform similar tests
> >to the ones you presented in Irvine to determine whether a -20dB
> >return loss injected at the mid-span will impact performance in a
> >measureable way.
> >
> >I would recommend using these 20uH inductors with a set of 1uF
> >high SRF caps in series on the line to isolate the DC from the
> >switch.
> > 1uF
> > 4>-----------------| |-------+-------------140m?---->4
> > )
> > )
> >Switch }---- DC+ DTE
> > |
> > |
> > 5>-----------------| |-------+-------------140m?---->5
> > 1uF
> > 1uF
> > 7>-----------------| |-------+-------------140m?---->7
> > )
> > )
> >Switch }---- DC- DTE
> > |
> > |
> > 8>-----------------| |-------+-------------140m?---->8
> > 1uF
> >The DTE device can take power from the center taps of its GigT
> >transformers per your earlier measurements.
> >
> >Of course, it would be nice to measure the actual 2-port
> >parameters of the injection device as well. I appreciate your
> >offer at the meeting to assist in this and hope you can find
> >time in your schedule to help out.
> >
> >Thanks,
> >
> >Dan Dove
> >HP ProCurve Networks
> >> -----Original Message-----
> >> From: R karam [mailto:rkaram@xxxxxxxxx]
> >> Sent: Thursday, January 25, 2001 10:33 AM
> >> To: stds-802-3-pwrviamdi@xxxxxxxx
> >> Subject: Doing Nothing About Anything?
> >>
> >>
> >>
> >> Hi
> >>
> >> if the Ad-Hoc's are not "secrets" can we have a list of the
> >> "active" ones
> >> while we are at it add a chili pepper next to a "hot"
> one, so we can
> >> have a beer a head of stepping in....
> >>
> >> the idea is to do some work a head of next meeting to help
> >> humanity power
> >> its future gadgets...
> >>
> >> rk
> >>
> >>
>