Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [802.3_EPOC] Exclusion bandwidth question

Eugene,

Forgive my ignorance in this subject matter, I certainly understand the need to mute portions of the spectrum so that DOCSIS and other users aren't impacted.  However, I don't see why co-existence with DOCSIS requires the ability to mute individual sub-carriers.

Please explain.

--kan--
--
Kevin A. Noll
Principal Engineer
Time Warner Cable
13820 Sunrise Valley Dr
Herndon, Va 20175
o: +1-703-345-3666
m: +1-717-579-4738
AIM: knollpoi


From: <Dai>, "Eugene (CCI-Atlanta)" <Eugene.Dai@xxxxxxx<mailto:Eugene.Dai@xxxxxxx>>
Reply-To: "Dai, Eugene (CCI-Atlanta)" <Eugene.Dai@xxxxxxx<mailto:Eugene.Dai@xxxxxxx>>
Date: Monday, September 10, 2012 5:02 PM
To: "STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>>
Subject: Re: [802.3_EPOC] Exclusion bandwidth question

I wonder without bandwidth granularity down to subcarrier level in OFDM(A) for EPOC PHY, how can we have interoperability? Ability to mute individual subcarriers is a way to have coexistence of EPOC with DOCSCIS, why not?

Thanks,
Eugene

From: Matthew Schmitt [mailto:m.schmitt@xxxxxxxxxxxxx]
Sent: Monday, September 10, 2012 4:40 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

________________________________

________________________________

________________________________________________________________________

To unsubscribe from the STDS-802-3-EPOC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-EPOC&A=1