Re: [802.3_EPOC] Latest objectives proposal

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Gentlemen,

From the 5 Criteria discussion, it seems to me the reference to more than 1 PHY has to do with passive versus active coax plants rather than below versus above 1 GHz.

Charaf

From: Hal Roberts [mailto:Hal.Roberts@xxxxxxxxx]
Sent: Tuesday, May 08, 2012 2:03 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EPOC] Latest objectives proposal

Kevin,

If a single PHY can operate over the wildly varying conditions found in wireless transmission (i.e. LTE or Wi-Fi with huge swings in signal strength, interference, multipath etc) surely a single PHY should suffice within the more controlled cable environment.

Hal

From: Noll, Kevin [mailto:kevin.noll@xxxxxxxxxxx]
Sent: Tuesday, May 08, 2012 1:53 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EPOC] Latest objectives proposal

There is some concern that operating in the lower bands is significantly different than operating above 1GHz, thus the PHY might need to be different. The reason for "at least one" is not to have equal and competing specifications, but to allow for two implementations that address multiple sets of coaxial conditions.

If the same goal can be attained by a single configurable PHY, then we would probably be okay with that.

--kan--

From: "Gomez Chano (LQNA MED)" <Chano.Gomez@xxxxxxxxxx>
To: Kevin Noll <kevin.noll@xxxxxxxxxxx>
Cc: "<STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] Latest objectives proposal

Hi,

I did not attend the last conference calls, but I have been following progress through the reflector. I have a question about the wording in Objective 1, which is now

"Specify at least one PHY to support subscriber access […]"

while previous proposal was:

"Specify a PHY to support subscriber access networks […] "

Can somebody clarify the rationale for the new wording, which seems to "almost" encourage the group to develop more than one PHY? We have all seen other IEEE groups that quickly yielded to the temptation of adopting multiple PHYs as soon as they realized that having the group agree on a single PHY was hard work. I would hate to see the same thing happening in EPoC, as this would cause market fragmentation and slow down adoption.

The objective should be "one PHY". Only if the group finds at a later stage a very good reason to develop more than one PHY then that option should be considered.

Just to be clear, for me it would be OK if the PHY for downstream and upstream channels have different parameters. As long as vendors do not have to face the decision of choosing between multiple and equally valid PHY options when implementing their products, that would still qualify as "one PHY" for me.

Best Regards

Chano Gómez

Lantiq North America

On May 8, 2012, at 9:38 AM, Noll, Kevin wrote:

<epoc_objectives_for_may_2012.pdf>

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