RE: [EFM-P2MP] clarification of grant and report
Miyoshi-san,
Regarding point a), the IPG is a period following the frame transmission
that is enforced by the MAC. It does not belong following the burst preamble
as you described in one of the options, as it is generated by the MAC
following frame transmission, and not prior to transmission.
I believe there was an error inserted in the draft regarding calculation of
tail_guard in section 64.2.3.1, and I have inserted an editor's note to try
to point it out to the readers.
Regarding point b) I agree that the OLT needs to allocate enough space to
allow for the frame transmission. The frame transmission is not just the net
frame, it also includes preamble+IPG, so I think these should be included in
the report.
Ariel
Ariel Maislos
Passave Inc.
1557 Jasper Dr.
Sunnyvale, CA 94087
ariel.maislos@passave.com
Tel: (408) 530 0458 Cel: (408) 242 8599
-----Original Message-----
From: owner-stds-802-3-efm-p2mp@majordomo.ieee.org
[mailto:owner-stds-802-3-efm-p2mp@majordomo.ieee.org] On Behalf Of Hidekazu
Miyoshi
Sent: Monday, June 09, 2003 3:51 AM
To: stds-802-3-efm-p2mp@ieee.org
Dear Members of P2MP STF,
I am writing this e-mail for clarification of grant and report. Attached
is a figure describing a detail of one grant. The points I want to
clarify are: a) the position of IFG especially in the case of one frame
transmission (for instance, sending REGISTER_REQ), and b) definition of
Queue Report.
On a), there would be two possibilities. One is inserting IFG before the
preamble as indicated in the figure. The other is after transmission.
The latter seems more legitimate, but in this case, we don't have to
consider PCS trailer (/T/R/R/) and IFG at the same time (IFC can include
/T/R/R/), while we see these two in the RANDOM WAIT state in Figure
64-27. Therefore, the position of after transmission does not make sense
from the interpretation of the current draft.
On b), queue reports represent bandwidth requirement for upstream. Thus
the reports should include frame sizes as well as IFG, preamble, etc.
Does everyone agree with this definition?
I would like to hear opinions on this issue.
Thanks,
Hidekazu