[EFM-P2MP] Comment resolution help
All,
I've received a comment from Piers that makes some amount of sense to
me but doesn't offer a concrete solution. I'll try to work something up
before next week but in the meanwhile, if anyone has some ideas before
the meeting, I'd love to hear them.
Thanks,
Ben
65.3.4, Page 591, Line 43
Comment:
Statement that "T_Code_group_align is defined in CROSS REF 36.3.2.4,
value is less than 4 octets." doesn't seem to be fully supported by
36.3.2.4, which says "In the event the PMA sublayer detects a comma+
within the incoming rx_bit stream, it may realign its current code-group
boundary, if necessary, to that of the received comma+ as shown in
Figure 36–3." May, not shall. And then "During the code-group alignment
process, the PMA sublayer may delete or modify up to four, but shall
delete or modify no more than four, ten-bit code-groups in order to
align the correct receive clock and code-group containing the comma+.
This process is referred to as code-group slipping." That's 4 slips max,
not a maximum time - it doesn't say it must slip at each comma+.
If the burst's training sequence is idles, doesn't only every other
code-group contain a comma? That would be 8 code-groups at best, not 4?
Suggested Remedy:
Write out explicitly what a PMA has to do to be usable in burst mode.
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Benjamin Brown
178 Bear Hill Road
Chichester, NH 03258
603-491-0296 - Cell
603-798-4115 - Fax
benjamin.brown@ieee.org
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