Re: [10GBT] FW: Contribution for May: Clause 55: Link Segment Specification
Chris/Brad-
I have the following suggestions from a 1st light cruise over (only) page
1 of the text.
P1L5
The text:
"Each of the four pairs supports an effective data rate of (2500)
Mbps in each direction simultaneously."
...could easily be misunderstood to imply that there is a separate data
path over each of the 4 pairs and that there is PHY level pair bonding as
in EFM Cu. As I understand it this is not the case, rather that group
coding across the pairs is being done.
I would suggest just dropping the sentence unless better text can be
developed.
P1L7
The sentence:
"The term 'duplex channel' will be used to refer to a single channel
with full duplex capability."
should not be necessary as this is already a defined term in 802.3, see
1.4.106 in 2002
Further, if you look at the rest of 802.3 and ISO/IEC 11801 the use of
the term "channel" refers to the full channel, not the per pair
channel. Not a good idea to invent new usage on a per clause basis.
P1L14
The text:
"The cabling system used to support 10GBASE-T requires 4 pairs of
ISO/IEC 11801 Class E or Class F balanced cabling with a nominal
impedance of 100 ohms."
(By the way, it is 802.3 convention to NOT use Greek symbols in drafts so
that meaning is not lost when pasting text from drafts across to other
applications in ASCII. The term "ohms" should be used. The
conversion to Greek symbols is a task for the publications editor.)
Should be changed to:
"The cabling system used to support 10GBASE-T requires ISO/IEC 11801
4pair Class E or Class F balanced cabling with a nominal impedance of 100
ohms."
Rationale:
4 pair cable is required. 2 instances of 2 pair cable (which is "4
pairs") is not assured of doing the trick.
P1L19
The text:
"10GBASE-T uses a star topology with Class E or Class F balanced
cabling used to connect PHY entities."
is not correct. It should be:
"10GBASE-T uses point-to-point with Class E or Class F balanced
cabling used to connect PHY entities."
Since this is not a repeatered network the topology of interconnecting
the bridges is way out of scope for this project. The scope of the
project is a point-to-point link.
P1L32
The text:
"segment ... and ... segment ... will provide a reliable
medium."
should be:
"segment ... and ... segment ... will provide reliable
media."
-OR-
"segment ... or ... segment ... will provide a reliable
medium." (PREFERRED)
At 07:16 PM 5/4/2004 -0700, Booth, Bradley wrote:
Dear Task Force members,
This will be posted on website in a couple of days, but here's a copy now
for you to review. Thanks to Chris for putting this together.
Regards,
Brad
-----Original Message-----
From: CDimi80749@aol.com
[mailto:CDimi80749@aol.com]
Sent: Tuesday, May 04, 2004 8:50 PM
To: Booth, Bradley
Cc: SKasturia@teranetics.com
Subject: Contribution for May: Clause 55: Link Segment
Specification
Brad,
Please find attached contribution D1.0 Clause 55 Link Segment
specification for posting.
Regards,
Chris DiMinico
editor: Clause 55.X Link Segment
cdiminico@ieee.org
MC Communications