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Reviewing the minutes, CAUI-2 is identified as raising multiple issues of BER and FEC.
Both 50G and 2x50G for 100G will require extensive discussion of the appropriate FEC; KR4 for backwards compatibility vs. KP4 for best link budget performance
and possible forward compatibility. CAUI-2 FEC is part of that discussion. However BER may not be an issue. CAUI-4 has to be support nearly error free operation with no FEC to support 100G LR4 and ER4 interfaces. It also has KR4 FEC to support 100G SR4 and CR4 interfaces.
In contrast, we can specify CAUI-2 to always require FEC, i.e. no no-FEC mode. Any module that supports 100G LR4 or ER4 with CAUI-2 interface will have to terminate the CAUI-2 FEC facing the host and demux. to internal 4x25G LR4 or ER4 optical lanes with
error free operation with no FEC. Chris From: John D'Ambrosia [mailto:jdambrosia@xxxxxxxxx]
All, Please take a moment to review the minutes from the Dec 9 meeting at the noted URL below. Discussions are underway regarding 50GbE/100GbE/200GbE and potential partitioning of some work that is being proposed to be done in 802.3bs. Such a decision
would require 75% consensus within the Task Force. Therefore, I encourage everyone to participate in these calls, as this will be a topic that we will need to discuss / address at our January Interim.
Regards, John D’Ambrosia Chair, IEEE P802.3bs 400GbE Task Force From: Mark Nowell (mnowell) [mailto:mnowell@xxxxxxxxx]
Copying the P802.3by reflector and the P802.3bs reflector… Mark |