Re: [802.3_EPOC] Exclusion bandwidth question
Thanks Tom, that helps.
That said, if that's the case, rather than specifying a minimum granularity, might it make sense to specify different performance characteristics for different granularities, so to speak? In other words, we could say that if you mute a single sub-carrier you get X amount of notching (and other associated parameters), if you mute a larger chunk of sub-carriers you'll get Y amount of notching, and if you mute still more you get Z amount of notching? That seems — at least on the surface — like it would accomplish the same goal while still providing a high degree of flexibility.
Another way to approach it might be to set a minimum required granularity, but also allow vendors to go below it if they can maintain noise and spurious, etc.
Thoughts?
Thanks.
Matt
From: "T Kolze @ Broadcom" <tkolze@xxxxxxxxxxxx<mailto:tkolze@xxxxxxxxxxxx>>
Date: Monday, September 10, 2012 3:29 PM
To: "STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>>
Cc: Matthew Schmitt <m.schmitt@xxxxxxxxxxxxx<mailto:m.schmitt@xxxxxxxxxxxxx>>
Subject: RE: Exclusion bandwidth question
Matt, all,
In answer to the first question: Yes.
In response to the second question: It is the difference between Spurious Emissions (or out-of-band spectral mask, etc.) and Adjacent Channel Rejection.
Later, tjk
From: Matthew Schmitt [mailto:m.schmitt@xxxxxxxxxxxxx]
Sent: Monday, September 10, 2012 2:23 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] Exclusion bandwidth question
Ed,
Thanks for the response.
I think a follow up question would be whether there is a difference between muting carriers for fitting into existing services vs. due to impairments. Is it an issue of how deep of a notch you need to make and how much noise can "spill over" so to speak?
Steve,
Good point about pilot tones. Although at the same time, we could probably write some rules around that, correct?
Thanks.
Matt
From: "Ed Boyd (Edward)" <ed.boyd@xxxxxxxxxxxx<mailto:ed.boyd@xxxxxxxxxxxx>>
Date: Monday, September 10, 2012 2:48 PM
To: Matthew Schmitt <m.schmitt@xxxxxxxxxxxxx<mailto:m.schmitt@xxxxxxxxxxxxx>>, "STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>>
Subject: RE: Exclusion bandwidth question
Hi Matt,
We were trying to specify the minimum required granularity. I agree that it could be less but it must be able to handle 6MHz granularity for the downstream so an operator could fill in any number of QAM channels with EPoC. This requirement is focusing on muting sub-carriers for the purpose of fitting into a spectrum plan with existing services. It is not a requirement for muting carriers due to impairments.
Hope that helps,
Ed…
From: Matthew Schmitt [mailto:m.schmitt@xxxxxxxxxxxxx]
Sent: Monday, September 10, 2012 1:40 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: [802.3_EPOC] Exclusion bandwidth question
With apologies for missing the first part of the call, I wanted to follow up on the discussion of exclusion bandwidth in the presentation materials that were reviewed on the call.
In particular, I wanted to ask the following question: is there any reason why we can't have granularity down to the level of a sub-carrier? Why does it need to be 6 or 8 MHz in the downstream, or 6.4 or 3.2 or 1.6 MHz in the upstream? Is there a reason we can't just mute individual sub-carriers? Does it really impact the complexity of the solution that much? Or is it more a concern regarding how deeply an individual sub-carrier can be muted? I'd like to better understand the implications and the tradeoffs here before I jump to one conclusion or another.
Thanks!
Matt
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