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
>>
>>