Kitz Forum
Broadband Related => FTTC and FTTP Issues => Topic started by: loonylion on July 30, 2014, 08:36:54 PM
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So we've had notification that the electricity company is going to shut us off for a period sometime next week, in order to upgrade their cables. What's the best way of making sure that DLM doesn't take offence and cripple my connection?
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B*Cat is your man for this, but I believe that if it's a mains failure (ie: power cut), the router sends a 'Dying gasp' to the DLM and it 'Remembers' your settings for when mains voltage is re-applied.
So, don't do anything. ;) :)
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If you know the day when the works are scheduled to take place, just power down the modem (so that it sends a "dying gasp") by switching off at the mains socket (or by removing the PSU from the socket) and then disconnect the the modem from the VDSL2 pair.
Once you know that the mains supply is restored and stable, reconnect the modem to the VDSL2 pair and then reinstate its power supply.
(In general, try to ensure that there is a good half-hour interval between the modem's power down and power up.)
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May appear to be a daft question, but I thought it best to ask ??
Is a power outage brought about by planned works, not the same as unplugging the router at the mains ?? I would have thought they were alike, therefore the EU wouldn't need to actually do anything ?? :)
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Normally a planned outage by your electric company will give you notice there may be a dissruption of service, though you will be connected to a backup generator before any work begins and if all go's well you won't notice any differerence that's the way it's done here.
Any unplanned electric outages (internal trip switch or storms) the rule of thumb is to dissconnect the modem from power source before you reset the trip switch and turn on the modem 30 minutes later.
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I may be wrong, but I'm sure I've read here recently that BT don't make use of the dying gasp. But whether they do or not, the best thing to do in my opinion would still be to switch off the modem/router before the planned outage and switch it on after the power returns. That way you can be sure that there will only be a single connection drop.
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I may be wrong, but I'm sure I've read here recently that BT don't make use of the dying gasp.
ADSL/ADSL2 users don't seem to suffer the same same effects from a power outage unlike FTTC users were any abrupt loss of power has a negative result on the DLM, It's just you need to wait 30min before powerup on FTTC.
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I think the maxim "better safe than sorry" applies. We all know how delicate Beattie can be! ::)
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they said we'll get advance notice, this was just an advance advance notice. I don't think there's going to be a generator because its the cable from the substation running along the street that's getting replaced. There's going to be roadworks etc, and the notice did imply that we'd be without power for a period of time rather than just a brief hiccup while they change sources.
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I may be wrong, but I'm sure I've read here recently that BT don't make use of the dying gasp.
Really ?? That's interesting Eric as I'm sure I read somewhere amongst the plethora of DLM guff, mention of the 'dying gasp' being in use ??
I would love to be able to verify this, but the 'Share-point' systems have been suspended as there is a re-org currently being undertaken.
I'm not known for my memory-power, so if evidence to the contrary can be shown I'm more than open to accept it. :)
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This is what I was referring to: http://forum.kitz.co.uk/index.php?topic=13943.msg262418#msg262418 (end of the third paragraph).
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Thanks, Eric.
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This is what I was referring to: http://forum.kitz.co.uk/index.php?topic=13943.msg262418#msg262418 (end of the third paragraph).
In that linked post we see that Kitz makes reference to the BT Wholesale DLM. However in this particular case, it is the Openreach DLM that loonylion wishes to avoid upsetting.
Until such time that Beattie removes all references to a "dying gasp" from all of her SINS, I will always advise taking the appropriate action as if a "dying gasp" is recognised by the DSLAM/MSAN at the "other end" of the metallic pathway.
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In that linked post we see that Kitz makes reference to the BT Wholesale DLM. However in this particular case, it is the Openreach DLM that loonylion wishes to avoid upsetting.
I must have missed or was absent from the class during the BT Wholesale DLM and Oprenreach DLM lecture.
Could someone explain the difference and how the EU would know which DLM is in effect as I just thought there was one in the FTTC MSAN :'(
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Have to admit, I too only thought there was one DLM ?? Forever learning. :graduate:
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For the NGA GEA FTTC product that is provided by Openreach there is only one DLM system.
That DLM system controls the VDSL2 metallic pathway which links the DSLAM/MSAN in the cabinet with the CPE modem.
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For the NGA GEA FTTC product that is provided by Openreach there is only one DLM system.
That DLM system controls the VDSL2 metallic pathway which links the DSLAM/MSAN in the cabinet with the CPE modem.
Thanks B*CAT so FTTC users are connected to Openreach DLM and ADSL/ADSL2 users are connected to BT Wholesale DLM.
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For the NGA GEA FTTC product that is provided by Openreach there is only one DLM system.
That DLM system controls the VDSL2 metallic pathway which links the DSLAM/MSAN in the cabinet with the CPE modem.
Thanks B*CAT so FTTC users are connected to Openreach DLM and ADSL/ADSL2 users are connected to BT Wholesale DLM.
I get the FTTC DLM bit ...... but are we saying that all ADSL-type circuits are controlled by BTw DLM ?? SKY have there own DLM, AFAIK, so how would that work ?? Pardon my ignorance here .... :-[
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...... but are we saying that all ADSL-type circuits are controlled by BTw DLM ??
No. :no: Obviously LLU'd circuits are not under the influence of BTw. Who "owns" and "controls" what is a well confusing topic. I would be surprised if there isn't a good description somewhere in the main Kitz site!
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Thanks for clearing that up, Mr Cat. I thought that may be the case, but one thing I've learned on here is not to assume. As you were. :graduate: ;D ;D
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No. :no: Obviously LLU'd circuits are not under the influence of BTw"
I here Sky's LLU DLM suck's big time :o
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Openreach DLM shouldn't react to a single power down even if its a power cut not safe shutdown.
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Indeed. It is not so much of the power down (by whatever means) that concerns me but the uncertainty of what happens when the power is restored. It is quite possible for the supply to come back up to its (almost) normal voltage and then be lost again, only to be restored (say) two minutes later.
With a VDSL2 service I would always advise a controlled power down of the modem by the end-user and, if in the case of engineering work on the public mains supply, only to power up the modem once: (1) a minimum of 30 minutes has passed since the controlled power down (2) the public mains supply is observed to be in a stable state.
(On the very rare occasions when I have experienced a planned outage of the public mains supply, I have powered down everything a few minutes before the planned start time and have just left one light in a switched-on state, to act as a tell-tale of the status of the supply.)
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Openreach DLM shouldn't react to a single power down even if its a power cut not safe shutdown.
Just one power outage can effect the users stats CHRY have had plenty of abrupt power outages over 2 years with VDSL2 active and with the stats also running could see the negative result.
I used to just find the torch and find the offending equipment which caused the trip switch to activate and isolate it then flick the trip into the on position that would have taken less than 7 minutes and hey ho the VDSL2 stats have been hit hard.
What I do now is to remove the 12V power plug from VDSL2 modem and flick the trip and wait 30 minutes before inserting the 12V power plug back into VDSL2 modem and stats have not been effected.
So in theory you could turn off the fibre modem 48 times in a 24 hour period as long as you wait 30mins before powering it up and the DLM will be none the wiser.
PS I am not going to test my above theory as do like a good nights sleep ;D