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

Re: [8023-POEP] Liaison letter from IEC TC65/SC65C/JWG10 - Power over Ethernet performance in industrial environments



Geoff,

We can speculate that an installation in a non-compliant environment
(not meeting the channel specification, not meeting appropriate EFTB
requirements, etc.) may suffer from unforeseen problems.

Perhaps we should write something in the standard that says, "If you do
unspecified things then unexpected results may occur." 

Hugh.

-----Original Message-----
From: owner-stds-802-3-poep@xxxxxxxx
[mailto:owner-stds-802-3-poep@xxxxxxxx] On Behalf Of Geoff Thompson
Sent: Tuesday, July 07, 2009 5:17 PM
To: STDS-802-3-POEP@xxxxxxxxxxxxxxxxx
Subject: Re: [8023-POEP] Liaison letter from IEC TC65/SC65C/JWG10 -
Power over Ethernet performance in industrial environments

Hugh-

On 7/7/09 4:01 PM, Hugh Barrass (hbarrass) wrote:
> It is
> possible that a system with a low impedance between Tx&  Rx pairs 
> could be damaged if the PSE incorrectly applies power, it is also 
> possible that the failure was related to a number of other conditions 
> that exist when large inductive loads are switching rapidly.
>    
Perhaps a combination of
     PVC insulation
     high humidty
     noisy environment from inductive load switching
     (and perhaps pair imbalance from ??)

Geoff