Re: [802.3_100GCU] Discussion of Objectives

[Adee Ran <adee.ran@xxxxxxxxx>]

Throwing in a couple more questions for discussion.

-          How about co-existence with 40GBASE-KR/CR – is it an objective or not?

-          Do we want to keep the virtual lane concept? 10GBASE-R encoding?

-          How about supporting/extending EEE (802.3az)?

-          Should we keep the "BER < 1e-12" objective from past projects?

o   Bengt's presentation suggests that this should scale up with speed (to maintain error rate over time).

o   On the other hand, legacy channels and new TX/RX implementation might make even 1e-12 challenging without FEC.

o   Maybe we should define two separate targets – one for FEC-protected and one for "raw"?

o   Maybe the target should be in terms of MTTFPA?

-          Considering FEC - is latency part of the objectives? Do we want to define a limit? Can FEC can be mandatory if it meets a lower latency requirement?

 

 

Adee

 

From: John D'Ambrosia [mailto:jdambrosia@xxxxxxxxxxxxxxx]
Sent: Monday, January 24, 2011 8:00 PM
To: STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Subject: [802.3_100GCU] Discussion of Objectives

 

All,

I wanted to try and foster some discussion on the reflector regarding objectives for the project to help all focus their planning of presentations for March. 

 

So what do we appear to have consensus on so far?

a)      We are in a  study group looking at 100GbE over backplane and copper twin-ax

b)      Legacy support indicates broad market potential would be aided by 4 lane solutions

 

What appears to need further consensus building?  Well the big ones would seem to be reach for both backplane and cu cabling objectives. 

 

So if we can combine where we appear to have consensus with what we need to resolve, the following two statements could be used as strawmans for objectives for the group to work towards (leaving the reach #’s as variables for now):

 

·         Define a 4-lane 100 Gb/s PHY for operation over copper traces on improved FR-4 for links consistent with lengths up to at least “X” m.

 

·         Define a 4-lane 100 Gb/s PHY for operation over copper twin-axial cables for links consistent with lengths up to at least “Y” m.

 

Feedback?

 

John