For CAUI-4 C2C the COM pass threshold is 2dB.
From my understanding, this threshold is part of a budget allowance for
receiver implementation. Receiver noise and jitter are not explicitly accounted
for in the COM algorithm...
Thank you,
Cristian
(613)963-1009
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Shawn Zheng
Sent: Monday, April 17, 2017 8:18 PM
To: silistguy@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: COM Limit -- Why 3dB?
Not always 3dB. For CA-25G-N cable assemblies the minimum COM is relaxed to
2.2 dB.
On Mon, Apr 17, 2017 at 3:43 PM, SI Guy <silistguy@xxxxxxxxx> wrote:
Does anyone know why the limit for COM in 25G ethernet spec is 3dB?
Does this have anything to do with the shannon-hartley theorem? I
would imagine but after putting in the numbers, I don't see a directly 1:1
relationship.
My brain has had bad gas today.
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