
IEEE P802.3ba D2.1 40Gb/s and 100Gb/s Ethernet comments Draft 2.1 Comments Working Group ballot
Response
#
77
Cl
87
SC
87.8.6.1
P
312
L
9
Comment Type
T
In the following, "should" is too weak for a definition. "Instantaneous decision sampling" is
utopian.
The reference transmitter... should meet the following basic requirements:
The rise/fall times should be less than...
RIN should be minimized to less than -136 dB/Hz.
The reference receiver should have the bandwidth...
The sensitivity of the reference receiver should be limited...
The receiver should have minimal...
Decision sampling should be instantaneous with minimal uncertainty and setup/hold
properties.
The sensitivity S... It should be measured while...
SuggestedRemedy
Change to
The reference transmitter... meets the following basic requirements:
The rise/fall times are less than...
RIN is less than -136 dB/Hz and should be minimized to .
The reference receiver has the bandwidth...
The sensitivity of the reference receiver is limited...
The receiver has minimal...
Decision sampling has minimal uncertainty and setup/hold properties.
The sensitivity S... It is measured while...
Similarly in 88.9.5.
ACCEPT IN PRINCIPLE.
In 87.8.6.1 and 88.9.5.1
Change "It should meet the following basic requirements"
To "The basic requirements are:"
Change "The rise/fall times should be less than"
To "Rise/fall times of less than"
Change "RIN should be minimized to less than"
To "RIN of less than"
In 87.8.6.3 and 88.9.5.3
Change "The reference receiver should have the bandwidth"
To "The reference receiver is required to have the bandwidth"
Change "The sensitivity of the reference receiver should be limited by"
To "The sensitivity of the reference receiver is limited by"
Change "The receiver should have minimal"
To "The receiver has minimal"
Comment Status
A
Response Status
C
Dawe, Piers Avago Technologies
Change "Decision sampling should be instantaneous with minimal uncertainty and
setup/hold properties"
To "Decision sampling has minimal uncertainty and setup/hold times"
Change "It should be measured while sampling at the eye center"
To "It is measured while sampling at the eye center"
Response
#
78
Cl
87
SC
87.3.1
P
303
L
5
Comment Type
E
The text "An upper bound to the delay through the PMA and PMD is required for
predictable operation of the MAC Control PAUSE operation." is a leftover from 10G where
the PMA and PMD delays are specified in combination. In 40G and 100G, they are
specified separately. The text could give the impression that controlling the delay through
the PMA and PMD determines predictable operation of the MAC Control PAUSE operation,
which is not true; above a very few 100 m, delay is dominated by the medium, and the
FEC, PCS and RS are also involved. 87 and 88 should not be talking about what the PMA
delay should be or why; PMA delay is addressed in 83.5.4.
Note another comment for a similar issue in other clauses.
SuggestedRemedy
Delete the sentence, here and in 88.3.1.
ACCEPT IN PRINCIPLE.
See response to comment 29
Comment Status
A
Response Status
C
Dawe, Piers Avago Technologies
Response
#
79
Cl
87
SC
87.4
P
304
L
4
Comment Type
E
If you resize the columns the heading row will fit on one line.
SuggestedRemedy
Select table, resize columns to contents, then resize to 432 points total. Also Table 88-2.
ACCEPT IN PRINCIPLE.
Comment Status
A
Response Status
C
Dawe, Piers Avago Technologies
TYPE: TR/technical required ER/editorial required GR/general required T/technical E/editorial G/general
COMMENT STATUS: D/dispatched A/accepted R/rejected RESPONSE STATUS: O/open W/written C/closed U/unsatisfied Z/withdrawn
SORT ORDER: Comment ID
Comment ID #
79
Page 19 of 111
7/16/2009 2:12:06 PM