Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Author Topic: VDSL Reboot Approach  (Read 347 times)

Bestgear

  • Member
  • **
  • Posts: 62
VDSL Reboot Approach
« on: September 13, 2018, 05:19:02 PM »

Guys

I am paranoid in terms of rebooting my HG612's - what is considered best advice in terms of how you should approach this?

Should I wait for a specific time window during the day?

Should I switch the modem off and wait "X" minutes before I power up again?

Any guidance to avoid upsetting DLM would be very much appreciated.

David
Logged

dee.jay

  • Member
  • **
  • Posts: 57
Re: VDSL Reboot Approach
« Reply #1 on: September 13, 2018, 09:26:55 PM »

Why do you need to?

Is the first question...
Logged
Line 1 - Sky FTTC - 57832/16972 - HG612
Line 2 - AAISP FTTC - 57731/16679 - HG612
Routed by pfSense on VMware ESX 6.0

underzone

  • Reg Member
  • ***
  • Posts: 240
Re: VDSL Reboot Approach
« Reply #2 on: September 13, 2018, 09:49:39 PM »

You get 20 odd reboots a day without DLM going crazy. Just pick a time that suits you/when the SNRM is optimal.
Logged
BT Infinity 2, Huawei 288, Zyxel VMG8924-B10A (bridge mode), pfSense

burakkucat

  • Global Moderator
  • Senior Kitizen
  • *
  • Posts: 23568
  • Over the Rainbow Bridge
    • The ELRepo Project
Re: VDSL Reboot Approach
« Reply #3 on: September 13, 2018, 10:10:04 PM »

A very simple rule of "paw" would be to power down the modem, for more than 15 minutes, somewhere between 1130 - 1200 hours. (If very paranoid, make it a 30 minutes down time.)
Logged
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

Please consider making a donation to support the running of this site.

dee.jay

  • Member
  • **
  • Posts: 57
Re: VDSL Reboot Approach
« Reply #4 on: September 13, 2018, 10:12:17 PM »

Wow, as many as 20?


Would explain how I got away with mucking about with my dad's line a few weeks back - he had some major issues with noise on the line - was simply due to a poorly fitted faceplate
Logged
Line 1 - Sky FTTC - 57832/16972 - HG612
Line 2 - AAISP FTTC - 57731/16679 - HG612
Routed by pfSense on VMware ESX 6.0

j0hn

  • Kitizen
  • ****
  • Posts: 1783
Re: VDSL Reboot Approach
« Reply #5 on: September 14, 2018, 12:05:42 AM »

10 or 20 depending on the ISP's chosen DLM profile.
That's assuming full 24 hours uptime which it won't be as it takes time to resync so probably 9 or 19 allowed per 24 hours.

Being scared to reboot the modem once in 3 month period is crazy as you could do it once a day and not bring it to DLM's attention.


Why do you need to?

Is the first question...

Memory usage increases over time.
Actual SNRM decreases over time (quite a bit on some modems).

I reboot my modem about once a month. It's the only resync my line has over the month so I don't bother waiting 30 mins as DLM isn't gong to care about a single resync.

As B*cat pointed out if you want to make sure DLM doesn't even count a resync then leave a full 30 mins between dropping sync and establishing sync again.
DLM works with 15 minute bins and if it sees 0 uptime for the 15 minute bin after the resync it will assume it was an unforced event and discount it.

https://kitz.co.uk/adsl/DLM.htm#MTBR

As you have 2 lines you could power 1 off for 30 mins. Reconnect it as you power off the 2nd. Bring that back up 30 minutes later. Then you have no downtime. That's if you're super paranoid about DLM that is :)
Personally I would just reboot them quickly.

If you want to get the highest possible sync then reboot them when the SNRM is at its highest. Some lines SNRM can vary by 1dB+ between morning and night and the attainable goes up and down with this.

Do your lines cause each other crosstalk? If so do you have an order in which you sync them?
Logged
BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 6053
  • Retd sw dev; A&A; 4 7km ADSL2; IPv6; Firebrick
Re: VDSL Reboot Approach
« Reply #6 on: September 14, 2018, 03:34:16 AM »

If you wish to be extremely careful, leaving it off for 30 minutes is the safest. But this is often not necessary in my experience. If memory serves, Kitz said that the ideal is to leave it off for the whole of the 15 minute period that is the next multiple of 15 minutes starting on the hour. So for example if you switch off at xx:14 you need to stay off until xx:30 throughout xx:15 - xx:30, and if you switch off at xx:16 then you need to stay off until xx:45 so as to be off throughout xx:30 - xx:45.
Logged

dee.jay

  • Member
  • **
  • Posts: 57
Re: VDSL Reboot Approach
« Reply #7 on: September 14, 2018, 08:00:20 AM »

j0hn, excellent answer.

I will admit I have been paranoid with reboots over the years, and often had 6-8 months uptime and never touched them!

Logged
Line 1 - Sky FTTC - 57832/16972 - HG612
Line 2 - AAISP FTTC - 57731/16679 - HG612
Routed by pfSense on VMware ESX 6.0

Bestgear

  • Member
  • **
  • Posts: 62
Re: VDSL Reboot Approach
« Reply #8 on: September 14, 2018, 05:30:17 PM »

Why do you need to?

Is the first question...

DSLstats is struggling to login - as the delay is too long - thus I really need to reboot the device.
Logged

Bestgear

  • Member
  • **
  • Posts: 62
Re: VDSL Reboot Approach
« Reply #9 on: September 14, 2018, 05:32:32 PM »

Thanks Guys for all the replies.

I will switch it off for 40mins to be safe!

I cant see anywhere to thank the contributions on you replies... so sorry for not saying "thanks".

David
Logged
 

anything