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[802.3_DWDM] Terminology Debate - Black Link

Dear .3ct and .3cw Task Forces

I want to note to both Task Forces that during the Optical Crosstalk Ad hoc call on 12/21 – the topic of naming the box between TP2 and TP3, which 802.3ct decided to call “black link” came up again. Some individuals disagreed with the decision of the 802.3ct TF to use the term “black link” to describe the methodology and the box between TP2 and TP3.  (See comment #i-1 to IEEE P802.3ct Draft 3.0.)

 

While it was recognized this was the decision of the Task Force, I think it would be fair to say not everyone was in agreement.  And with full disclosure, I as an individual, am one of those people.  I believe the use of “black link” to define both the methodology and the aggregate group of DWDM channels or the “box” between TP2 and TP3, is just asking to cause confusion for future readers.

 

As previously discussed in my presentation to the .3ct TF - https://www.ieee802.org/3/ct/public/tf_interim/20_1214/dambrosia_3ct_01b_201214.pdf, there are also other issues related to both project’s PAR scopes

  • 802.3ct – “Define physical layer specifications and management parameters for the transfer of Ethernet format frames at 100 Gb/s and 400 Gb/s at reaches greater than 10 km over DWDM systems.”
  • 802.3cw  - “Define physical layer specifications and management parameters for the transfer of Ethernet format frames at 400 Gb/s at reaches greater than 10 km over DWDM systems.”

 

PHYs are defined as part of DWDM Systems, so there is a certain lack of clarity / conciseness with our PAR scopes, given our definition of DWDM systems and our scope to define physical layer specifications.

 

I still believe the easiest path to success was the 2nd option recommended in the presentation –

 

Consider redefining “DWDM system” to be what is defined in Clause 154.6 / Fig 154-3. See

Slide #7

  • Modify “Black ‘link“ definition as per response to i-1
  • Potential re-definition for 1.4.237d DWDM system - An aggregate of DWDM links channels optically multiplexed and demultiplexed onto and off either a single optical fiber or a single optical fiber per direction.
  • Above recommendation would then clear up noted PARs Scopes issues

 

However, as I noted this approach does not appear in line with the approach defined in G.698.1 and G.698.2.

 

If people don’t find black link acceptable to describe the aggregate of DWDM channels between TP2 and TP3, and don’t like DWDM systems, then we will need to consider another term, such as “DWDM Network” and evaluate potential ramifications to project documentation.

 

Hopefully – this email will help kick off some additional conversation on the reflector that can lead to consensus building.

 

Regards

 

John D’Ambrosia

Chair, IEEE P802.3ct Task Force

Chair, IEEE P802.3cw Task Force

 

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