[802.3_25GSMF] [802.3-25GSMF] "PMD" versus "PHY"

[David Lewis <David.Lewis@xxxxxxxxxxxx>]

Colleagues,

There has been some discussion via email about the pros and cons of stating our objectives as either:

 

Provide PMD specification which support 25 Gb/s operation over at least 10 km on SMF.

Provide PMD specification which support 25 Gb/s operation over at least 40 km on SMF.

 

Or alternatively:

 

Provide Physical Layer specifications which support 25 Gb/s operation over at least 10 km of SMF.

Provide Physical Layer specifications which support 25 Gb/s operation over at least 40 km of SMF.

 

In order to ensure we have consensus before submitting the PAR, I would like to request a presentation or presentations arguing the case for one versus the other.

 

I have received a statement from Kohichi Tamura that for 40 km he does not see a need for a different FEC than the one already included in 802.3by.  Therefore the argument in favor of saying “Physical Layer” is that we will need to include changes to non-PMD clauses in order to implement any new PMDs.

 

Please let me know ASAP if someone is willing to make a presentation on this subject and I will add it to the agenda for Monday.

 

Regards,

David Lewis

Acting SG Chair