[802.3_NGMMF] Dynamic behaviour of MMF links

[Jonathan King <jonathan.king@xxxxxxxxxxx>]

Following up on the comments from the floor at the P802.3cm meeting this morning on the topic of dynamic behavior of MMF links, there was quite a bit of work on this in the LRM project, 802.3aq.

 

The standard, GR-63-CORE, which describes the vibration tolerance for central office equipment which is helpful in bounding the level of vibration to be expected.  In summary, there are two acceleration levels 0.1g and 1g described which effectively limit the amplitude vs frequency of any vibration source.  For 1g max at 1 Hz the peak-to-peak amplitude of vibration is 50cm, broadly equivalent to vigourous manual shaking of a fibre patchcord.  At 50 Hz the peak-to-peak amplitude is perhaps 20 microns, too small to produce significant modal noise in an MMF link.  There’s some experimental data based on quasi-static measurements which show how the impulse response of a fibre changes as a MMF coil is perturbed in

http://www.ieee802.org/3/aq/public/nov04/king_2_1104.pdf .

My conclusion is that the frequency range of interest is in the 1 Hz to 10Hz range for our 802.3cm project.

 

Best wishes

jonathan

 

From: Robert Lingle <linglerobertjr@xxxxxxxxx>
Sent: Saturday, March 09, 2019 7:03 PM
To: STDS-802-3-NGMMF@xxxxxxxxxxxxxxxxx
Subject: [EXTERNAL]: [802.3_NGMMF] Fwd: [802.3_DIALOG] IEEE 802 Vancouver Schedule now on-line

 

All, please see the attached schedule and room assignments for Vancouver!

 

Remember 802.3cm meetings 8am Monday in a co-located Interim.  Warm regards,

Robert

---------- Forwarded message ---------
From: Steven B. Carlson <scarlson@xxxxxxxxxxxxx>
Date: Tue, Mar 5, 2019 at 12:24 PM
Subject: [802.3_DIALOG] IEEE 802 Vancouver Schedule now on-line
To: <STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx>

Colleagues,

The on-line schedule for Vancouver is now on-line at:
http://schedule.802world.com/schedule/schedule/show#

I have also updated the link on the IEEE 802.3 Meetings page.

Safe travels, and see you all in Vancouver!

Regards,

Steve

Steven B. Carlson
Chair, P802.3ch Multi-Gig Automotive Ethernet PHY Task Force
Executive Secretary, IEEE 802.3 Ethernet Working Group
http://www.ieee802.org/3/index.html
President
High Speed Design, Inc.
Portland, OR
scarlson@xxxxxxxxxxxxx 

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