Re: [10GBASE-CX4] comments on latest CX4 revision
Hi Clark,
We discussed this and the conclusion was that there will be some impairment
caused by the fixturing (loss, etc) but that must be calibrated out by the
user. We did not want to get into mandating how much loss, what kind of
SMAs, etc. Rather, we spec the signal at the interface and rely upon the
user to be able to make that measurement.
This is consistent with 1000BASE-T and other 802.3 technologies where the
measurement requires some calibration by the user to compensate for probe
effects.
Dan
>
>
>54.7.3.6 Differential Output Template and Figure 54-3
>The interconnect from the MDI to the scope for measuring against this
>template has not been adequately described. I could not find any
>information on the plumbing. A tight template like this one must be
spec'd
>along with the interconnect hardware.
>
>Please consider readily available adapters and cables for this. I suggest
>that the test interface be comprised of a 1m, 24AWG cable to connect
>between the MDI and a GigaCN-to-SMA adapter board. If you don't have one
>of these boards yet, you will soon! From the SMA to the scope, we can use
>short, high quality cable. This is easy and convenient.
>
>
>Regards,
>Clark Foley
>Maxim Integrated Products
>(503) 547-2018
>
>