Thanks for that linky on ASSIA, Ive had a quick read through, but tbh Im not much the wiser, a lot of it seems to be green marketing.. but Ive no doubt it does have its uses... see below for futher comments.
I dont know enough about the subject.. but having read that, it does not appear to have anything to do with the usual PSD masks applied to the MSAN. PSD masks are entirely separate from any DLM profile. The PSD masks are kinda 'set in stone' depending upon the type of adsl you have and line length.
a lot of new sky connections on their forum (including me , some of my friends and my neighbours) all got substantially lower than what the line is capable (from Line Attenuation figure) and what I/they had with previous ADSL2+ provider -
I strongly suspect this is more down to Skys DLM and the depth of interleaving applied.. hence me calling it aggresive - particularly on new lines. The depth of interleaving sometimes seems to be high to start off with... far higher than some lines need. This is what keeps the sync speed low. Sky will lower it if you request it from them.. other than that it 'may' be higher than lines may actually need keeping the speed down.
>>> Output Power would be static
No... output power can and does change on the fly depending upon the current line conditions.. as mentioned earlier it can increase or decrease depending on whats happening at the current time. For example if you sync at a bad time and your sync speed is low.. but later on conditions improve, then the power output can decrease.
As mentioned earlier normal sync time power would expected to be in the 18-19dBm region.. but the MSAN can also ramp up the power to 20dBm if it senses it may be struggling.
At this point it does seem perhaps like this could be something that the ASSIA unit does.. or would do. However this is something that the MSAN has been able to do since rate adaptive dsl came into force many years ago. Even pre-maxdsl power cut back was in force and could be clearly seen on shorter lines... however on fixed rate lines it did appear to be more static... but that could be that not as many people checked their line stats often when on say 2Mb fixed rate.
This also begs the question do the BTw MSANs* already have something in them that does similar to what ASSIA claims to do.. cutting back on the power not only reduces crosstalk but it will also have the slight added benefit of reduced power consumption. Because the ASSIA module seems to claim to do what the BTw* MSAN already does to a certain extent anyhow.
*I refer to the BTw MSANs and although I cant be sure, I would assume that LLU ISPs MSANs do similar - Be*'s certainly does.
>> Is Interleaving or its Depth directly related to INP.
Depth. It the depth that relates to how much redundant data is in the RS codeword, ...that is then interleaved in the block. The more redundant data there is, the slower the 'real time' speed due to the overheads.
>> FEC RS and Interleaving are two types of "correction" methods that are applied to lines arent they?
They are separate entities, but work in tandem.
Think of RS encoding as putting in redundant data in case some of it gets lost due to noise.
Interleaving on its own isnt strictly error correction.. its simply a method of chopping up data and mixing it with other blocks of data...
.....so that if any part of the bit stream gets lost, theres enough information held within another data block(s) for meaningful data to be recovered from the redundant RS data. It needs some sort of redundant data to be effective.. and thats where the RS encoding comes into play.
>> .but I aint had time to read the whole thing
Sorry - not had time to read any of it lol.. I really am outa time too now and I still have a few things to do before I head to my bed.