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Re: [STDS-802-3-400G] IEEE P802.3bs 200 Gb/s and 400 Gb/s Ethernet SMF Ad Hoc conference call

Hi Matt,

I meant a decrease of course J

 

The lower ref Rx bandwidth is the direct consequence of switching to a T spaced EQ, and does a nice job of matching the ref Rx with anticipated Rx implementations.

Increasing TDECQ is a direct consequence of the lower reference bandwidth.

 

A ‘real’ transmitter and receiver that passed D3.1 TDECQ definition will still pass D 3.2 TEDCQ provided that TDECQ increases by 0.9 dB. Unstressed receiver sensitivity (defined for a transmitter SECQ = 0 dB) should decrease by 0.9 dB.  This leaves the min Tx OMA at max TDECQ at the same OMA (i.e. no change to the ‘real’ Tx), no change to the SRS test source in terms of applied stress (because D3.2 reference bandwidth means that the SECQ of the SRS test source will increase by 0.9 dB without changing it’s stress conditions),  and so no change to the SRS test OMA.

 

For example (made up numbers)

The TDECQ spec would increase by 0.9 dB, eg from 2.5 dB to 3.4 dB.

The OMA minus TDECQ spec would decrease, eg from -1.5dB to -2.4 dB.

SECQ would move in line with TDECQ, ie from 2.5 dB to 3.4 dB.

 

For the receiver sensitivity (informative) spec, we have choices

either remove it (it isn’t an operating condition the receiver would ever see for a compliant Tx and link, and it’s meaningless for an equalized system anyway),

or lower the spec value by 0.9 dB and say it’s for a 0 dB SECQ test source,

or keep it the same and say it’s defined for a 0.9 dB SECQ test source

 

Hope this helps.

jonathan

 

From: Matt Traverso (mattrave) [mailto:mattrave@xxxxxxxxx]
Sent: Monday, June 19, 2017 8:16 PM
To: Anslow, Peter <panslow@xxxxxxxxx>; STDS-802-3-400G@xxxxxxxxxxxxxxxxx; Jonathan King <jonathan.king@xxxxxxxxxxx>
Subject: RE: [STDS-802-3-400G] IEEE P802.3bs 200 Gb/s and 400 Gb/s Ethernet SMF Ad Hoc conference call

 

Hi Jonathan,

I’m sorry to have missed the most recent ad hoc where you presented king_01a_0617_smf.  I find myself confused as to what you mean by: “a similar decrease in the OMAouterminus TDECQ spec”.  Can you show an example with what would happen for the TX or RX table for any of the clause 122 PMD’s?

 

I think this all stems from a mixing of terms increase/decrease with negative numbers…

 

Thanks

--matt

 

 

logo_Grey

 

Matt Traverso

PRINCIPAL ENGINEER.ENGINEERING

mattrave@xxxxxxxxx

Cisco Systems, Inc.

3700 Cisco Way
SAN JOSE
95134
United States
cisco.com

 

 

 

 

 

From: Anslow, Peter [mailto:panslow@xxxxxxxxx]
Sent: Tuesday, June 13, 2017 1:12 AM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-3-400G] IEEE P802.3bs 200 Gb/s and 400 Gb/s Ethernet SMF Ad Hoc conference call

 

Hi,

 

As previously announced, there is an SMF Ad Hoc meeting starting at 8:00 am Pacific today, Tuesday 13 June.

 

Attendees names and affiliations will be taken from the Webex participants list. Please use an e-mail address indicating affiliation when signing in. If you attend via phone only, or if your employer and affiliation are different, please send me an e-mail.

 

I currently have requests for 1 presentation so the draft agenda is:

 

o   TDECQ changes and consequent spec limits                              Jonathan King, Finisar

 

  • Discussion

 

The presentation for this call is on the P802.3bs SMF Ad Hoc web page.

If you have any questions for the presenter(s) after the call, please ask the Ad Hoc Chair for contact details.

 

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: Every 2 weeks on Tuesday, from Tuesday, 13 June 2017, to Tuesday, 27 June 2017 at 16:00, GMT Summer Time (London, GMT+01:00)

To join web meeting click here: https://ciena.webex.com/ciena/j.php?MTID=m8af2937bfb4b6fd299ccb5ee317895fb

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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: 765 992 3550


Meeting number: 632 000 521

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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=mfc13bf723def2cc42b90e63cc52f8635

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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 |