Re: [IEEE1904.1] Powersaving Ad Hoc - Sleep Protocol

[Duane Remein <dremein@xxxxxxxxx>]

 All,
I would like to suggest that we strive for as simple a sleep protocol as 
possible, this strategy has always served Ethernet well in the past.
With this in mind I would like to propose that we only allow the OLT to 
be the sleep cycle initiator (this is required for "synchronized" sleep 
anyway).  We should encourage (require?) the OLT to initiate the sleep 
cycle(s) often and with liberality.  By this I mean the OLT should not 
presume upon the ONUs desire to stay awake, even if the OLT believes the 
ONU will be receiving data in the near future.  The real decision to 
Sleep or not to Sleep should belong to the ONU.  In essence I suggest 
that the OLT send the ONU a "hall pass" to sleep and the ONU decides if 
it wants to sleep or not.   It would be very simple to include a field 
in the sleep invite to inform the ONU of impending DS data so the ONU 
could take that into account.
Making this overly complicated will do nothing to keep costs down, which 
is always an issue for any access technology.

Bye the way I had an action item to investigate various timers in the 
MPCP which might have relevance to sleep.  I've only found four, see the 
attached MS Word doc for a quick summary with xref. to 802.3.  Basically 
there are three 50 ms timers and one 1 sec timer.  Two of these are 
defined as constants but I think it would be very simple to ask 802 to 
redefine them as variables with default times set to 50 ms or 1 sec as 
appropriate.  I don't believe this would impact any state diagrams in 
the 802.3 spec.

Best Regards,
Duane

Attachment: MPCP timers related to ONU Sleep.docx
Description: application/vnd.openxmlformats-officedocument.wordprocessingml.document

begin:vcard
fn:Duane "Du Wen" Remein
n:Remein;Duane
org:FiberHome Telecommunication Technologies Co., LTD
adr:;;8012 Selfridge Ct.;Raleigh;NC;27615;USA
email;internet:Duane.Remein@xxxxxxxxxxxxxxxx
title:Technical Director of Standards
tel;cell:+01 919 418 4741
x-mozilla-html:FALSE
version:2.1
end:vcard