Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

DTE Power Objectives




Hello All,

I am planning to perform some testing of the noise injection
characteristics of DTE Power on some 10/100T PHYs to determine
if we gain a benefit by using the "unused pairs" for power
distribution. I am building a board that allows me to hook
up a switching power supply and a switching load to the center
tap of the data-pairs and the non-data-pairs. I can also use
a signal generator/network analyzer to evaluate the common-mode
to differential conversion factors.

I am wondering who else is working on this and whether the 
other items on the list are being addressed. We are getting
pretty short on time for the next meeting.

Regards,

Dan Dove
___________     _________________________________________________________
_________    _/    ___________  Daniel Dove         Principal Engineer __
_______     _/        ________  dan_dove@xxxxxx     LAN PHY Technology __
_____      _/           ______  Hewlett-Packard Company                __
____      _/_/_/ _/_/_/  _____  Workgroup Networks Division            __
____     _/  _/ _/  _/   _____  8000 Foothills Blvd. MS 5555           __
_____   _/  _/ _/_/_/   ______  Roseville, CA 95747-5555               __
______        _/      ________  Phone: 916 785 4187                    __
_______      _/      _________  Fax  : 916 785 1815                    __
__________  _/ _________________________________________________________
        I n v e n t !
 DTE ISSUES MATRIX

--------------------------------------------
AC or DC Power?
--------------
- AC Frequency, voltage, other issues?
- DC Switcher impulses, filtering, other issues?

Detection Method?
----------------
- FatLinkPulses
- Diode Detection (Current Sense)
- Diode Detection (Voltage Sense)
- Constant Current Sink
- Other?

Which pairs?
------------
- 12,36 impact on 10/100
  - DM/CM conversion characteristics vs frequency       *** Can do
  - 100BASE-T noise immunity                            *** Can do
  - Switcher frequency content                          *** Can do
- 45,78 impact on installed base coverage
  - CM/CM coupling between pairs                        *** Maybe can do
EMI
---
Common-mode insertion
- Conducted EMI
- Radiated EMI
- Susceptibility 

MidSpan Insertion
-----------------
- Transformer coupling    *** Can do
- Return Loss w/wo power  *** Can do
- Insertion Loss          *** Can do
- EMI 
- Susceptibility
- Detection method compatibility

Safety
------
- SELV limits
- Japanese or other International limits