ftth, [and thread]
I've gone over your [uplinked] message and I see that we're (maybe it's just that I am) all over the map, partly due to jumping from the interactive stb discussion between here and LMT, and the DOCSIS cable modem topic. [Mike, you are not the only one who is now confused. smile ]
I agree with your point in your PM that we need to take a moment to level-set and establish some common terminology before we take this further.
I would advise anyone who has an interest in this topic to disregard my previous responses to ftth's last post, since I apparently misunderstood what he was referring to by PDAMA and prematurely proceeded to comment on it.
I don't have a handle on the specifics of this protocol other than a general understanding of the principles involved, namely, windowing [which you called scheduling, same thing], or the allocation of time slots, which is dependent on the number of other users on line, for the transmission of upstream data.
I'd like to re-state that we are talking about DOCSIS Cable Modem operation, not interactive set top box flows, for now, and that we should focus on both the upstream and downstream dynamics, one at a time. I think that's a good start. What say?
By the way, I did a couple of searches on PDAMA in hotbot and lycos, and the closest thing I got was a reference from 1995 of a modified PDAMA used in satellite systems. The other hit was for some pharmaceutical act passed by congress. If you have a paper to point to during your reply, it would be much appreciated. Likewise, I have several recent vintage residential broadband technology texts which make reference to DOCSIS in some detail but do not mention this protocol, although they do describe in rather over-generalized terms what it does.
So, ftth, please take over from here, since yours is a far better understanding, using more precise and up-to-date terminology, than mine. If you would, describe the PDAMA dynamics in the upstream direction in more detail, and while you are at it give us a refresher on what takes place in the downstream operation again, as well, citing DOCSIS 1.0 and 1.1 approaches, if there are any differences between the two. TIA.
FAC |
