[EFM] RE: [EFM-P2MP] 10G EPONs (it was MPCP: Report message)
Is this 3 channels of HDTV per ONT x 32 ONTs x 18.5 Mbps/channel = ~1.8
Gbps?. If so it seems 2.5 would work.
Fiber Offer Development Mgr
OFS Systems Engineering
From: carlosal@xxxxxxxxxxxxxxxxxx [mailto:carlosal@xxxxxxxxxxxxxxxxxx]
Sent: Tuesday, February 12, 2002 1:02 PM
Cc: email@example.com; firstname.lastname@example.org;
Subject: [EFM-P2MP] 10G EPONs (it was MPCP: Report message)
> May be we should be specifying 10G-EPON given that the service
> providers are looking at 30x3 channels of HDTV per PON.
> By the time 1G-EPON is standardised it could be too little
> too late (again).
Serious. Why not investigate this? It may look like overkill, but we should
at least understand the price/performance here. Let us see how do it fare:
- it does not need to be 1 Gbps, or 10 Gbps. Maybe 2.5 Gbps is a good
compromise for the near future.
- higher bit rate can be used to counterbalance the relative inneficiency
of the MPCP protocol. It's a diminishing return equation - the faster the
system, the less efficient it will turn out because of the fixed parameters
such as laser on/off times. A sweet spot may lie at some point.
- how do the cost increase with higher speed optics (more than 1 Gbps),
compared with a more complex (and efficient) MPCP implementation?
Did someone check this at some point over the past few months?
[Just to remind, once again: traditional Ethernet was half duplex, only
40-60% typical efficiency. It was fast enough for a long time, and *much*
less expensive than any of the alternatives. As technology evolved, it was
possible to go full duplex, and the rest is history.]