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Re: [STDS-802-3-400G] P802.3bs SMF Ad Hoc

Pete,

No disagreement on trying to increase the BMP.

One caveat I would add is that many of these links are built on the assumption of a loss budget. For example, the 4 MPO + 4 LC could be seen as a maximum worst case scenario. It is extremely expensive to build a 4 MPO + 4 LC environment, especially for a 500m reach; therefore, I think it is more likely the end users would avoid this topology. In an enterprise environment, it is more likely that it is a 4 MPO + 2 LC could be seen. Especially if one does the implementation as 4x100G instead of a true 400G link. Given that we're focused on 400G and a 500m reach, this is more likely a 4 MPO only link. Given the added impact of the extra 2 MPO, many operators using these links may decide to do a splice rather than using a patch panel. Patch panels are fine for structured cabling environments, but they certainly impact the cost of building the topology.

Just my 2 cents,
Brad


On Thu, Feb 4, 2016 at 5:12 AM, Anslow, Peter <panslow@xxxxxxxxx> wrote:

Marco,

 

While I agree that many links for DR4 could be just 4 connectors, I think that the PHY has a better Broad Market Potential if it can be deployed in a variety of links including 4MPO + 4LC.

 

I ran Jonathan’s spreadsheet for both cases (attached) and (as per comments in the Atlanta meeting) the additional -55 dB reflections don’t make much difference to the 1E-6 penalty.

 

Consequently, I think that we should accommodate the 4 x -35 and 4 x -55 dB link.

 

Regards,

Pete Anslow | Senior Standards Advisor
43-51 Worship Street | London, EC2A 2DX, UK
Direct +44 2070 125535 |

 

From: Marco Mazzini (mmazzini) [mailto:mmazzini@xxxxxxxxx]
Sent: 03 February 2016 14:33
To: Anslow, Peter; STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: RE: P802.3bs SMF Ad Hoc

 

Hi Pete,

from meeting minutes :

 

“A chart showing this result was shown and this was added to an updated version (anslow_01a_0216_smf) of the presentation posted after the close of the meeting. As there are only four high reflection connectors in the double link scenario in kolesar_3bs_01_0514, Pete said he would re-run the spreadsheet with four -35 dB connectors and four -55 dB connectors.”

 

For parallel XCVR like DR4 (http://www.ieee802.org/3/bs/public/14_05/kolesar_3bs_01_0514.pdf, slide 6 and 7), the double link has just 4 MPO, while 4MPO + 4LC is applicable to 2-fiber XCVR (duplex).

So if this is still valid, the spreadsheet should be run with four connectors only for DR4 and eight connectors for FR8/LR8.

 

Regards

Marco

 

From: Anslow, Peter [mailto:panslow@xxxxxxxxx]
Sent: Wednesday, February 03, 2016 3:05 PM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-3-400G] P802.3bs SMF Ad Hoc

 

Hi,

 

The draft minutes from yesterday’s SMF Ad Hoc call are on the P802.3bs SMF Ad Hoc web page, together with a revised version of the presentation.

 

As discussed on the call, the next SMF Ad Hoc call is scheduled for Tuesday 16 February from 9:00 to 11:00 PST (meeting details attached).  If you are interested in presenting, please request a timeslot by Noon PST on Monday 15 February.

 

Peter Anslow from Ciena has invited you to join a meeting on the Web, using WebEx. Please join the meeting 5-10 minutes early so we may begin on time.

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Topic: "P802.3bs SMF Ad Hoc"

Date & Time: Tuesday, 16 February 2016 at 17:00, GMT Time (London, GMT)

To join web meeting click here: https://ciena.webex.com/ciena/j.php?MTID=me16fceb1501af53165ed106c67377329

Meeting password: IEEE (please note passwords are case sensitive)

Teleconference: Provide your phone number when you join the meeting to receive a call back. Alternatively, you can call:

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Conference Code: 207 012 5535


Meeting number: 631 437 491

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Additional Notes:

- To add this meeting to your calendar program click the following link, or copy the link and paste it into your Web browser: https://ciena.webex.com/ciena/j.php?MTID=mb2e4c545747092c04cfe5a90822b395d

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https://ciena.webex.com

 

 

Regards,

Pete Anslow | Senior Standards Advisor
43-51 Worship Street | London, EC2A 2DX, UK
Direct +44 2070 125535 |