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[8023-POEP] Reminder - 350uH Ad Hoc conference call Wednesday 28th May at 6:00PM BST; 1:00 PM EDT; 12:00N CDT; 10:00AM PDT



Colleagues,

Just a quick reminded that the IEEE P802.3at DTE Power via MDI 
Enhancements the 350uH Ad Hoc is holding a conference call today. I have 
received one presentation from George Zimmerman titled 'Alternative 
Specification to OCL Inductance to Control 100BASE-TX Baseline Wander' for 
the meeting which is attached.

Best regards,
  David Law



IEEE P802.3at 350uH chartering motion
-------------------------------------

Authorise the formation of an adhoc to discuss the approaches available to 
provide an additional, alternative, conformance requirement to ANSI X3.263 
subclause 9.1.7. Appoint Mr. Law as the Chair of the Ad-Hoc. Report 
results back to IEEE 802.3.


Proposed Agenda
---------------

[1] Patent policy
[2] Review and approve agenda
[3] Brief review of last report [ 
http://www.ieee802.org/3/at/public/nov07/law_1_1107.pdf ]
[4] Review IEEE P802.3at/D3.0 comment #415
[5] Alternative Specification to OCL Inductance to Control 100BASE-TX 
Baseline Wander presentation
[6] Discuss next meeting / call of adhoc


Meeting information
-------------------

CALL DATE:            May-28-2008  (Wednesday)
CALL TIME:            6:00PM BST; 1:00 PM EDT; 12:00N CDT; 10:00AM PDT
DURATION:             90 Minutes

LEADER:               Mr David Law
PARTICIPANT PASSCODE: 22724

For security reasons, the passcode and the leader's name will be required 
to join your call.

DIAL-IN NUMBERS:

UK       020-7950-1261          0800-018-0669
USA      210-795-0460           877-474-8998


IEEE P802.3at/D3.0 comment #415
-------------------------------

Comment:
3% unbalance current may require assumptions on compatible 100BASE-TX 
transceivers (beyond the standard) with regards to baseline wander. 
Imbalance currents for this standard go beyond the OCL current 
specifications in the ANSI FDDI specification referenced by the 100BASE-TX 
MDI spec.  Modification or assumption of modifications common in the 
market is implied.
(also in Table 33-9, line 21)

Suggested remedy:
Either, restrict higher currents to 100BASE-TX which meet additional 
requirements or (preferred) modify the MDI specification for compatible 
100BASE-TX equipment to specify the signal presented at the MDI. - a 
parallel comment will be submitted to maintenance to  work this issue by 
providing a specification of the 100BASE-TX signal at the MDI.

Response:
Recharter the 350 uH Ad Hoc and pass this information on.


droop_spec_1.pdf