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Mike, That’s my initial proposal.
However if enough people object to the 0.7 dB reduction in sensitivity & SRS, we’ll need to introduce a loss table similar to the one in 100GBASE-DR. During the ad hoc call there was opposition to the idea of giving users a tradeoff table for insertion loss for the 10km application.
The point was that some users would want to operate over existing cable plant currently operating at 10 Gb/s.
If we were to accept what I proposed, then those users would still need to check on how many connectors and the RL of each one, before knowing they could use it for 25 Gb/s.
At least they would not need to measure channel loss before knowing they could re-use a 10 Gb/s cable. David Lewis From: Dudek, Mike [mailto:Mike.Dudek@xxxxxxxxxx]
Is your proposal to not make any allowed trade offs between number of connectors and link loss? If so I think the numbers in the table on slide 6 would be replaced by ticks. I do wonder with such a large
difference between TDP and the allowance for penalties whether we should give people a clue what that is for. Maybe split the row into two. One that says “Allocation for TDP” (value of 2.7dB) and the other says “Allocation for other penalties including
Multi Path Interference” (value of 0.7dB). From: David Lewis [mailto:David.Lewis@xxxxxxxxxxxx]
All, At the ad hoc on Wednesday I took an action to provide the changes that would be needed in the optical link parameter tables for an MPI penalty of 0.7 dB. See the attached presentation for what I think is needed. The approach is to tighten Rx sensitivity and SRS by 0.7 dB for both the -LR and -ER variants. In addition this proposal tightens the Transmitter reflectance from a maximum of -12 dB to a maximum of -26 dB. Please use the reflector for discussion of this topic. Our next ad hoc is on Wed June 28th and will be the only one between now and when the sponsor recirculation ballot ends. Regards, David Lewis P802.3cc Task Force Chair |