Re: [802.3_EPOC] EPoC Bandwidth Discussion

[Geoff Thompson <thompson@xxxxxxxx>]

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
> *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
>
> *From:* Duane Remein [mailto:Duane.Remein@xxxxxxxxxx]
> *Sent:* Monday, August 20, 2012 11:32 AM
> *To:* 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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