Re: [802.3_EPOC] EPoC Bandwidth Discussion
All,
No quite being an RF guy, but having worked in the cable industry for over 20 years… (for those thinking that I am old… I started when I was 19 years old ;-)
My 2 cents…
I would propose that when speaking of RF capacity we refer to it as spectrum. So, in the case of the discussion referenced by this Email thread, we say "spectrum for EPoC" or "EPoC spectrum".
I think that the term bandwidth can be ambiguous unless it is used in a specific context, such as "the bandwidth of an analog cable channel is 6 MHz" and I also hear "the bandwidth of the highest HSD tier is 300 Mbps".
Jorge
From: Duane Remein <Duane.Remein@xxxxxxxxxx<mailto:Duane.Remein@xxxxxxxxxx>>
Reply-To: Duane Remein <Duane.Remein@xxxxxxxxxx<mailto:Duane.Remein@xxxxxxxxxx>>
Date: Monday, August 20, 2012 1:15 PM
To: EPoC Study Group <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>>
Subject: Re: [802.3_EPOC] EPoC Bandwidth Discussion
Geoff,
I see your point, could we at least agree to preface there term with “Spectra” when referring to RF (old habits, the only kind I have at this point, die hard)?
Best Regards,
Duane
FutureWei Technologies Inc.
duane.remein@xxxxxxxxxx<mailto:duane.remein@xxxxxxxxxx>
Director, Access R&D
919 418 4741
Raleigh, NC
From: Geoff Thompson [mailto:thompson@xxxxxxxx]
Sent: Monday, August 20, 2012 1:04 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] EPoC Bandwidth Discussion
Colleagues-
Just goes to show the extent to which Wikipedia is not an authoritative source.
The answer to this question is obvious within the word itself. Bandwidth is the width of the spectral band, i.e. it is an analog measurement.
The so called "digital bandwidth" is not a bandwidth it is "channel capacity" or "data rate" or "bit rate".
To illustrate how silly it is to use the spectral term for the digital term just think of it in concrete terms.
You would never use the term "pavement width" when you mean "cars per hour".
I took a brief tour of older clauses of 802.3 and the term is mostly used correctly. There are several instances (which are unfortunately duplicated in several places) where "bit rate" would have been more accurate.
I would strongly prefer that we preserve its analog meaning and use other appropriate terminology for digital rate measurement (even if it means bucking current common terminology).
Geoff Thompson
On 208//12 9:22 AM, Hesham ElBakoury wrote:
Jim,
Wikipedia defines bandwidth as follows:
Bandwidth has several related meanings:
* Bandwidth (signal processing)<http://en.wikipedia.org/wiki/Bandwidth_%28signal_processing%29> or analog bandwidth, frequency bandwidth or radio bandwidth: a measure of the width of a range of frequencies, measured in hertz
* Bandwidth (computing)<http://en.wikipedia.org/wiki/Bandwidth_%28computing%29> or digital bandwidth: a rate of data transfer, bit rate or throughput, measured in bits per second (bps
Hesham
From: Jim Farmer [mailto:jfarmer@xxxxxxxxxx]
Sent: Monday, August 20, 2012 8:50 AM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] EPoC Bandwidth Discussion
Unfortunately, as if often the case, we have multiple different definitions for the same term – as an RF nerd myself, I had difficulty getting used to “bandwidth” referring to data. But the data usage certainly is a common use of the term. If we need to differentiate the two, I’d suggest the shorter term “RF bandwidth” when we need to differentiate the two.
Thanks,
jim
Jim Farmer, K4BSE
Chief System Architect,
FTTP Solutions
Aurora Networks
1220 Old Alpharetta Rd.
Ste. 370
Alpharetta, GA 30005 USA
678-339-1045 (office)
678-640-0860 (mobile)
jfarmer@xxxxxxxxxx<mailto:jfarmer@xxxxxxxxxx>
From: Duane Remein [mailto:Duane.Remein@xxxxxxxxxx]
Sent: Monday, August 20, 2012 11:32 AM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] EPoC Bandwidth Discussion
Steve,
Your use ot the term “bandwidth” completely threw me, I’ve always associated this term with data bandwidth.
Can I suggest we use something like Spectrum Channel Width – defined as a portion of RF spectrum dedicated to a transmission channel or sub-channel.
Once we agree on such a term Marek can then add this to the definitions list.
Best Regards,
Duane
FutureWei Technologies Inc.
duane.remein@xxxxxxxxxx<mailto:duane.remein@xxxxxxxxxx>
Director, Access R&D
919 418 4741
Raleigh, NC
From: Shellhammer, Steve [mailto:sshellha@xxxxxxxxxxxx]
Sent: Friday, August 17, 2012 6:42 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: [802.3_EPOC] EPoC Bandwidth Discussion
EPoC Group,
Several of us had a good discussion on EPoC bandwidth this morning. I would like to see if there are other who would like to join us for future calls on Friday mornings (10 AM Pacific Time).
If anyone else would like to join us, please send me an email and I will add you to the meeting invite.
Once we have some slides put together we will review them on the Monday AM calls, hosted by Comcast.
Steve
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