Re: [802.3_NGBASET] NGBASE-TSR
Hi Dan,
I believe I did have this mis-understanding, and I believe this helps.
Still wondering, perhaps the name could be different. SR for short reach implies limited capability. Perhaps it could be called HE for high efficiency, or LP for low power, thereby emphasizing its positives instead of its negatives.
Also, you explained before to me, that if a TSR PHY was matched with a non-TSR PHY at a longer distance, they would link up at 1G instead of at 10G. Is this still your vision? Or would the TSR PHY include the circuitry, not normally energized, to allow it to communicate over the full length at normal speed?
Wayne
11/16/12
-----Original Message-----
From: Daniel Dove [mailto:ddove@xxxxxxx]
Sent: Thursday, November 15, 2012 5:15 PM
To: STDS-802-3-NGBASET@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGBASET] NGBASE-TSR
Dear Study Group Participants;
I have received some feedback that my promotion of NGBASE-TSR has been
received as a "multi-PHY" proposal.
This may be due to the structure of my presentations, the language used,
or graphics used to represent the proposal. It may also be due to my
lack of time in the group, due to my responsibilities in P802.3bm. If
so, I apologize.
My proposal is for a single PHY (at each speed) that can operate in
different modes. Much like 10GBASE-T has a "30m mode".
The key difference, is that for 10GBASE-T, we didn't sufficiently
provide for the Auto-Negotiation functionality to make it work properly.
In addition, I think having a naming mechanism for the different modes
enables appropriate market separation for products that choose to use
that PHY in particular modes.
I plan to bring in a presentation in January that comes in at a
higher-level, explaining the market benefits rather than diving into the
technical benefits as I have done so far.
In the mean time, I just wanted to make it very clear. Its a single PHY
(per speed) that operates in different modes.
This is part-and-parcel to the argument I have been making that a PHY in
short-reach mode PHY must inter-operate with a PHY in long-reach mode
when operating on a cable that meets the short-reach parameters.
If you wish to discuss this further, provide feedback, and/or
suggestions, please feel free to contact me. I would appreciate the input.
Best Regards,
Dan Dove
dan_dove@xxxxxxxx