[SI-LIST] XAUI - How to understand the "Compliance interconnect definition"
- From: Edison Green <edisonluckforever@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 8 May 2012 20:54:33 +0800
I am confused when I study XAUI SPEC which in the Cause 47.41 of IEEE
standard 802.3
The Compliance interconnect definition describe as follow:
|S21|?|S21|limit=-20log(e)*[a1*f^2+a2*f+a3*f^2]
This limit applies from DC to 3.125 GHz. The magnitude response above 3.125
GHz does not exceed -11.4 dB
ISI loss>4dB
The ISI loss,defined as the difference in magnitude response between two
frequencies, is greater than 4.0 dB between 312.5 MHz and 1.5625 GHz.
My question is that:
If my interconnect is shorter and the insertion losses(S21) is small also,
it maybe can't satisfy the "Compliance interconnect definition".
My interconnect charactar S21 will be
>|S21|limit=-20log(e)*[a1*f^2+a2*f+a3*f^2]
ISI loss will be <4db according to the definition(because abs(S21) may <4db)
In my mind, the shorter , the better, is it wrong?
How to understand the "Compliance interconnect definition"?
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