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Ed, Note that even though EPON sets the *nominal* distance for PMDs (e.g. 20 km for PR30), it is not uncommon to see deployments which have longer reach. Having the efficiency depend on the network diameter would be at least unfortunate … Not trying to take sides here, just making an observation Marek From: Ed (Edward) Boyd [mailto:ed.boyd@xxxxxxxxxxxx] Dave, I tried to explain my concerns to your TDD repeater presentation at the meeting but time was limited. I think that it would be easier over email. If you have more than one OCU with different fiber delays, the GAP for turning around between upstream and downstream would be the fiber propagation delay. As Steve showed in his presentation, the upstream can’t be started until the downstream has been received. With this criteria, I would assume that the GAP will be 100us for the repeater (the propagation delay difference on the fiber). Is this correct? Thanks, Ed… |