Thread Links | Date Links | ||||
---|---|---|---|---|---|
Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
Dave,
These results are at room temperature; there was an off-line
discussion of this topic in San Francisco. My understanding is that spectral
width changes ~0.6 nm/C so I think the shift due to temperature is
small.
Steve
Steven E.
Swanson t 828-901-5328
swansonse@xxxxxxxxxxx From: David Lewis [mailto:David.Lewis@xxxxxxxx] Sent: Monday, August 15, 2011 1:31 PM To: Swanson, Steven E; STDS-802-3-MAINT@xxxxxxxxxxxxxxxxx Subject: RE: [802.3_MAINT] Follow up on proposed Comment to add distance specification for 10GBASE-S over OM4 media Hi Steven, Is this data taken over
temperature, e.g. -40 to +85C module case temperature, or at room temperature
only? David
Lewis From: Swanson, Steven E
[mailto:SwansonSE@xxxxxxxxxxx] Matt
etal, I had
our guys look at the VCSELs we have purchased on the open market used in our
test facilities; there are 70 transceivers from 6 different manufacturers. 78%
of the spectral widths are less than 0.35. The triple trade-off numbers are as
follows: 1. The
average spectral width is 0.286 2. The
average wavelength is 849.4; worst case 845.7 3. The
average OMA power is -1.24; worst case -2.42 Using
these numbers in the IEEE model yields 5.2 dB of margin at
400m. Using
these numbers in the IEEE model yields 3.3 dB of margin at
550m. The more
I look at this, I think we are being REALLY, REALLY conservative in
IEEE, maybe too much so; here is the distribution of spectral
width: Steven
E. Swanson t
828-901-5328 swansonse@xxxxxxxxxxx
From: Matt Traverso
(mattrave) [mailto:mattrave@xxxxxxxxx] Hello to the now very active IEEE Maintenance
reflector! As I mentioned during my presentation at the IEEE plenary in
July I would like to schedule a few calls to follow up on the questions/comments
raised during the meeting. (see http://www.ieee802.org/3/maint/public/traverso_1_0711.pdf) My goal for these calls per the discussion on the floor is to
try to build more confidence in the proposed reach value. I believe that
there was broad consensus at the meeting that (a) goal of specifying value is
worthwhile,(b) theoretical analysis was sound. I hope to confirm my
perception at the first call & discuss further justification for 400m
reach. My intention is to submit a comment by the comment deadline
of Aug 26th. Call timing: Wednesday Aug 10th, 10 – 11:30 am PT Wednesday Aug 17th , 10 – 11:30 am
PT Meeting login details below best regards --matt traverso -+-----+-----+-----+-----+-----+-----+-----+-----+- Meeting Number: 203 920 382 Meeting Password: OM4 ------------------------------------------------------- To start this meeting ------------------------------------------------------- 1. Go to https://cisco.webex.com/cisco/j.php?J=203920382&PW=NNjg0OTljYThj 2. Log in to your account. 3. Click "Start Now". 4. Follow the instructions that appear on your
screen. ---------------------------------------------------------------- ALERT:Toll-Free Dial Restrictions for (408) and (919) Area
Codes ---------------------------------------------------------------- The affected toll free numbers are: (866) 432-9903 for the
San Jose/Milpitas area and (866) 349-3520 for the RTP area. Please dial the local access number for your area from the
list below: - San Jose/Milpitas (408) area:
525-6800 - RTP (919) area: 392-3330 -------------------------------------------------------
To join the teleconference only -------------------------------------------------------
1. Dial into Cisco WebEx (view all Global Access Numbers at
http://cisco.com/en/US/about/doing_business/conferencing/index.html
2. Follow the prompts to enter the Meeting Number (listed
above) or Access Code followed by the # sign. San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330
US/Canada: +1.866.432.9903 United Kingdom:
+44.20.8824.0117 India: +91.80.4350.1111 Germany: +49.619.6773.9002
Japan: +81.3.5763.9394 China:
+86.10.8515.5666 CCM:+14085256800x203920382# |