Re: [802.3_RTPGE] Fw: [802.3_RTPGE] PoE ad hoc - new information
Dave et al,
The requirements from Industrial Automation according
the question list FYI:
1. Is PoE as defined in Clause 33 of the current
standard adequate for RTPGE?
Yes, IEEE 802.3at is adequate in
principle, some additional requirements
exist:
-
For substation automation,
4kV surge on signal lines without interference transmitted should be
supported.
-
A chassis
ground is always available.
-
The maximum length of a PoE segment is
100m.
-
PoE channels will be treated like non-PoE
channels.
-
A daisy-chain configuration may be
desirable.
The EEE for industrial
automation is done by using a higher layer protocol for Device-shut-down, not by
switch off the power.
With that we can daisy
chaining the power to decouple the topology from the logical grouping of devices
that can be switched off.
With best
regards,
Ludwig Winkel
Siemens AG
Industry
Sector
Industry Automation Division
Sensors and Communication
Fieldbus
Communication
I IA SC FC
Oestliche Rheinbrueckenstr. 50
76187
Karlsruhe, Germany
Tel.: +49 721 595-6098
Mobile: +49 172 6132658
mailto:ludwig.winkel@xxxxxxxxxxx
Siemens Aktiengesellschaft:
Chairman of the Supervisory Board: Gerhard Cromme; Managing Board: Peter
Loescher, Chairman, President and Chief Executive Officer; Roland Busch,
Brigitte Ederer, Klaus Helmrich, Joe Kaeser, Barbara Kux, Hermann Requardt,
Siegfried Russwurm, Peter Y. Solmssen, Michael Suess; Registered offices: Berlin
and Munich, Germany; Commercial registries: Berlin Charlottenburg, HRB 12300,
Munich, HRB 6684; WEEE-Reg.-No. DE 23691322
All -
Another clarification - discussion about a CFI in particular is out of
scope in this meeting.
Dave
----- Forwarded Message -----
From: Dave Dwelley
<ddwelley1@xxxxxxxxx>
To:
STDS-802-3-RTPGE@xxxxxxxxxxxxxxxxx
Sent: Wednesday, July 18, 2012 10:39
AM
Subject: [802.3_RTPGE] PoE
ad hoc - new information
All -
A couple of clarifications: the meeting this afternoon is intended to
address all PoE topics, not just RTPGE-focused topics. The goal is to decide
whether it makes sense to hold a new CFI to address all PoE topics, including
RTPGE, PoE++, and any other relevant PoE topics. Please invite anyone who can
contribute (and is present in San Diego) who is not on the RTPGE
reflector.
The RTPGE meeting is expected to break around 2:30 today, so this PoE
meeting will start immediately afterwards. Meet in the lobby outside Manchester
D.
Dave