RE: [10GBASE-T] PAR and 5 critters
Just to clarify, Vativ, Broadcom & Marvell presented capacity calculations
at the Portsmouth meeting and showed that worst-case CAT-7 (Class F) cabling
had sufficient channel capacity to achieve 10Gbps throughput at 100 meter
distance. The reason for "may be possible" statement in the conclusions was
that the 3 PHY vendors felt that more work needed to be done on practical
implementation issues before the conclusion could be altered to a more
In addition, we proved conclusively that there was NOT sufficient channel
capacity on existing CAT-5e (Class D), or CAT-6 (Class E) cables to achieve
10 Gbps throughput.
[mailto:email@example.com] On Behalf Of Alan Flatman
Sent: Tuesday, July 29, 2003 9:51 AM
To: Kardontchik, Jaime
Cc: [unknown]; Sterling Vaden
Subject: RE: [10GBASE-T] PAR and 5 critters
Message text written by "Kardontchik, Jaime"
>Was any reason given why it would not run on Class F ? Was it for
technical reasons or for marketing reasons ?<
The 3-PHY vendor presentation made in Portsmouth (sallaway_1_0503)
calculated 49.36 Gbit/s capacity using unscaled Cat 7/Class F cabling. This
figure was reduced to 37.71 Gbit/s with worst case limits. Overall, I
thought that this was a refreshingly realistic presentation and I
interpreted the summary statement "Capacity calculations with measured data
indicate 10 Gigabit data transmission over 100m Cat 7 may be possible"
(slide 16, bullet 3) as overly cautious engineering judgement.
So, what has changed since the May interim? Not the laws of physics!