If this happened, then
the line is likely to remain at a very low rate till a re-train is forced by the user
powering off the Active NTE.
Does this mean that an end user can force a complete retrain (just like an ISP or BT engineer can request) just by unplugging the modem? If so, for how long must it remain disconnected?
Confusion easily arises from the poor choice of words by someone in BT in the past, with the same being an ongoing problem - not just in respect of line training.
Whenever a modem communicates with another one, since data transmission was invented, the initial process of negotiation they carry out by sending various signals back and forth, to determine the optimum rate at which to set up the link, is called "training". That's what the poster is talking about.
Unfortunately when BT Wholesale introduced IPStream and related/similar products they used the word "training" to refer to a 10-day period during which the system's parameters for noise margin and a few other things were established, though in practice these are/were established on most lines during the first 75 minutes, and the rest of the 10 days merely records the lowest sync speed in that period. That becomes the MSR, and the FTR is 80% of the MSR.
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