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RE: [802.3af] FW: ETSI standard for Line power for IP terminals


We have a liaison letter on this and have invited them to join our project.



Steven B. Carlson
Co-Chair, ESTA Control Protocols Working Group
Chair, ESTA ACN Task Group
Chair, IEEE 802.3af DTE Power via MDI Task Force
High Speed Design, Inc.
11929 NW Old Quarry Road
Portland, OR 97229
FAX 503.626.4206

-----Original Message-----
From: owner-stds-802-3-pwrviamdi@xxxxxxxxxxxxxxxxxx
[mailto:owner-stds-802-3-pwrviamdi@xxxxxxxxxxxxxxxxxx]On Behalf Of Bob
Sent: Tuesday, July 24, 2001 2:04 PM
To: 'Kevin Brown'
Cc: stds-802-3-pwrviamdi@xxxxxxxx
Subject: RE: [802.3af] FW: ETSI standard for Line power for IP terminals
Importance: High

My mistake. The active pointers were fro cisco internal. However, if you go
to the ETSI web site, click on Standards on line, and then
earch for TR 101 941 and then for ES 201 910 you can download both of the
documents. I am not sure if I can upload Cisco's copy (in fact, I am sure i
can't). But the documents are there so that is where you can get them.

Siorry about that ---- Bob

>-----Original Message-----
>From: Kevin Brown [mailto:kbrown@xxxxxxxxxxxx]
>Sent: Tuesday, 24 July, 2001 1:50 PM
>To: 'rtbell@xxxxxxxxx'
>Subject: RE: [802.3af] FW: ETSI standard for Line power for IP
>I'm not sure if it's a firewall issue, but I could not access the URL's
>listed below.
>The URL directs me to IP address, but does not
>connect ("a
>connection with the server could not be established").
>Kevin Brown
>-----Original Message-----
>From: Bob Bell [mailto:rtbell@xxxxxxxxx]
>Sent: Tuesday, July 24, 2001 11:42 AM
>To: stds-802-3-pwrviamdi@xxxxxxxx
>Subject: [802.3af] FW: ETSI standard for Line power for IP terminals
>To all -
>I received this pointer and thought it would be good to
>forward it on to
>Cheers ---- Bob
>-----Original Message-----
>From: Colin Wilson [mailto:cpwilson@xxxxxxxxx]
>Sent: Tuesday, 24 July, 2001 10:23 AM
>To: standards-announce@xxxxxxxxx
>Cc: shamilto@xxxxxxxxx; mphipps@xxxxxxxxx; rtbell@xxxxxxxxx;
>Subject: Fwd: ETSI standard for Line power for IP terminals
>ETSI work group TC-AT is developing a standard for line powering of ip
>phones using ethernet and this also implies a requirement for
>the equipment
>supplying power to the phones.  There is a little addition
>beyond 802.3af
>in that it incorporates reduced line powering in the event of a network
>failure, similar to basic rate restricted power.  The intent
>is to get this
>standard ratified at the September meeting but there is still
>quite a bit
>of work to be done so we can input to the standard if we wish.
>An ETSI study into the standards for IP phones was published
>as TR 101 941
>and available at:
>Following the completion of the study the draft standard for
>line powering
>was started as ES 201 910, which is available at:
>The work was originally pushed by Phillips but is now being driven by
>Telecom SA.  Anyone working in this area please contact me to
>set up some
>discussions in a smaller group.
>Colin Wilson
>>X-Mailer: Novell GroupWise 5.5.4
>>Date: Wed, 18 Jul 2001 14:49:18 +0200
>>From: "Robert Jürgens" <JURGENRW@xxxxxxxxxxxx>
>>To: <cpwilson@xxxxxxxxx>
>>Subject: Line power for IP terminals (resend)
>>Dear  Colin
>>Attached please find a draft specification: "Line power for
>IP terminals"
>>ES 201 910 V1.1.1 (work item DES/AT0020013 ) for your comment and
>>input(Iptermlinepowerd2.doc). I have taken the proposal that
>was discussed
>>and accepted at the March meeting and compiled it in the correct ETSI
>>format, adding what I could.
>>I will appreciate it if you can have good solid look at the
>>and provide some comments. As you will see, there is still a number of
>>items outstanding and your input will be highly valued.
>Please take note
>>of the 'issues" paragraph at the end of the specification.
>>If possible, I would like to have the document approved at
>the September
>>meeting. (Since the scope of this document is outside of my level of
>>expertise, I therefore will have to rely on your expertise.)
>>About the Specification:
>>The specification is based on the IEEE 802.3af draft 1.1, DTE
>Power via
>>the MDI  (also attached) as decided in ETSI. As you will see, IEEE
>>specifies the power supply characteristics on the LAN side
>(PSE) as well
>>as the characteristics for the terminals (PD's) to be able to receive
>>power from the LAN. This was accepted "as is" in the last
>ETSI meeting.
>>Additional to the above, the ETSI specification addresses a
>possible power
>>fail situation on the LAN side, which will leave the IP
>terminal without
>>power resulting in basic communication breakdown. (The scope
>of the IEEE
>>specification does not cover the reliability or
>interruptability of the
>>power supply to the terminal.) To achieve basic emergency
>>with a line powered IP terminal in the event of a power fail,
>the current
>>proposal is to specify i) limited (emergency) back up power
>for the LAN
>>ii) reduced power consumption for a limited number of "emergency" IP
>>terminals (to conserve the limited LAN power) and iii) a means of
>>communicating the switch over from normal to limited power (and visa
>>versa) to the terminals when the power failure (restoration) occurs.
>>Main outstanding areas are:
>>Definition of messages to convey the different power states
>of the Line
>>Specification of the backup power when the normal LAN power
>supply fails.
>>Please do not hessitate to call me or mail or fax.
>>Kind regards and thank in advance.
>>Robert Jürgens
>>Rapporteur ETS WI DES/AT-020013
>>TC AT Digital workgroup
>>Telkom SA - Technical Product Management
>>tel +27123111041
>>fax +27123285312
>>mobile +27825541270
>>emial: jurgenrw@xxxxxxxxxxxx
>>This message was also sent to Ed Hay of Mitel