RE: Doing Nothing About Anything?
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
>
>