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In order to include a chip to retimed module specification in 802.3ba, application level input is required on expected module trace lengths, host trace lengths, numbers of via, etc. for 40GbE and 100GbE. It would be extremely useful if this information can be provided in terms of loss.
The XLAUI / CAUI team would appreciate any feedback in this area. To start the discussion Chris Cole has already submitted the following input in Comment 295:
Max module trace length 3”
From: Ryan Latchman
Hi Ali, Chris,
This is an important discussion which needs to get resolved quickly.
I would like to ensure that XLAUI / CAUI maintains its broad market applicability as a simple retimed interface. I don’t think the current specification methodology prevents it from being leveraged to build retimed modules. I’ve put together the attached material to show how retimed interfaces were specified in the past (namely XFI). In XFI, you’ll notice that the Before Connector and After Connector specs are similar. 40/100GbE modules may have an analogous situation, depending on their size and electrical characteristics.
If we need to change the XLAUI / CAUI specification, we need solid contributions on what needs to change.
From: Ali Ghiasi [mailto:aghiasi@xxxxxxxxxxxx]