> Is there any advantage to asking a modem to power down.
They may have something ‘dying gasp’ whereby there is a little bit of stored energy that powers the modem for enough time to allow it to throw out a short message to the exchange. Yip would have to ask about this as memory fails me.
However if you pull the phone line out, then this cannot happen obviously.
So it cannot hurt to let the modem power down in an orderly fashion, seeing as we may or may not know whether the dying gasp mechanism is present we might as well assume that it it.
Iirc kitz says that dying gasp is not taken into account by DLM anyway and she is the expert. BT had to handle the case when there is no dying gasp anyway, either because of pull-outs or possibly because the mechanism is not present, but I don’t know about the latter.
Someone knowledgeable will I hope chip in?
About DLM. From experience you can upset OR by doing swapping of modems. Iirc it might be less if you are on ADSL2+/21CN. In the old days you certainly could get into trouble, from experience, and kitz recommendations implied that you when you turn a modem off you should wait leaving it modem switched off, but think about this in terms of what the exchange sees one each particular line, and not turn it back on or substitute an alien, until the next but one fifteen minute slot. Slots are 00, 15, 30, 45 mins past the hour, so you leave it off for at least 15 mins so there is a whole slot during which it is off for the entire time. If it is switched off at xx:01 you have to wait until xx:30 according to this idea, so that xx:15-xx:30 is covered.
I used to follow that and it saved me. Not observing it did get me into trouble and modem swap outs got me into trouble with DLM in the old days. But in recent years I have just found that nothing matters at all.
I am not a good guide in this thought seeing as I can reset the target SNRM values both up/down and restart the training period (supposedly) using my ISP’s website myself by hand whenever I need to and others may not be so lucky.