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Author Topic: SNR drops over the course of a few days  (Read 1848 times)

jnexkk

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SNR drops over the course of a few days
« on: December 23, 2017, 05:43:41 PM »
Hi, my SNR drops over time, but the weird thing is, when i reboot the modem, it goes back to normal, no matter what time of the day.. It won't go back up unless i reboot either. Even if mr SNR drops to 0.3 (which was just the case), i reboot and the SNR margin goes back to 6.2 for instance.
This is causing a lot of problems, because when my SNR drops, the internet becomes sluggish.
Does anyone know what i can do ? Could it be a router problem ?
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burakkucat

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Re: SNR drops over the course of a few days
« Reply #1 on: December 23, 2017, 07:05:05 PM »
Yes, it could possibly be a problem with the modem/router. What is its make/model?
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kitz

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Re: SNR drops over the course of a few days
« Reply #2 on: December 23, 2017, 09:19:02 PM »
Quote from: burakkucat on December 23, 2017, 07:05:05 PM
Yes, it could possibly be a problem with the modem/router. What is its make/model?

Indeed. One of the other things that occurs to me is if bitswap is turned on?
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burakkucat

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Re: SNR drops over the course of a few days
« Reply #3 on: December 23, 2017, 09:52:46 PM »
Quote from: kitz on December 23, 2017, 09:19:02 PM
One of the other things that occurs to me is if bitswap is turned on?

Likewise! I was holding on to that thought . . . until the device in question had been disclosed.
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konrado5

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Re: SNR drops over the course of a few days
« Reply #4 on: December 23, 2017, 10:10:40 PM »
I have similar issue with my upstream SNR margin. My upstream SNR margin continously drop (about 1 dB over month). But when I reconnect my upstream SNR margin goes back to standard value with similar synchronization rate.
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jnexkk

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Re: SNR drops over the course of a few days
« Reply #5 on: December 24, 2017, 03:53:54 AM »
Second hand zyxel vmg1312-b10a. I've tried different cables and faceplates, not much of a difference
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kitz

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Re: SNR drops over the course of a few days
« Reply #6 on: December 24, 2017, 05:15:59 AM »
Quote
i reboot and the SNR margin goes back to 6.2 for instance

Because Target SNRM is ~6.3dB a resync should always recover your SNRM to this level*
Does your sync speed deteriorate after a resync or does it always stay at about the same level?


*Barring DLM intervention such as banding.
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jnexkk

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Re: SNR drops over the course of a few days
« Reply #7 on: December 24, 2017, 05:25:56 AM »
aye, the Sync stays the same. 60meg with a 72meg attainable, with that linearly dropping with a perfect ramp down over the course of a week, until i reboot again.
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jnexkk

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Re: SNR drops over the course of a few days
« Reply #8 on: December 24, 2017, 08:02:10 AM »
I just plugged in the old Openreach modem and i'll see how it goes. Unfortunately i won't be able to monitor it will i? It feels a bit snappier and i can use the internet while downloading a file now, which i was unable to do before
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kitz

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Re: SNR drops over the course of a few days
« Reply #9 on: December 24, 2017, 10:38:50 AM »
Which Openreach modem is it?
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jnexkk

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Re: SNR drops over the course of a few days
« Reply #10 on: December 24, 2017, 11:26:57 AM »
ECI
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