Constant intermittent signal loss

[Asir]

At the begining of May this year I started constantly losing the signal for my TV and internet. It would always go out and come back after 30 seconds to a couple of mins. I have called tech support 8 times, have had someone come out and look at it 3 times, and have had the gateway replaced 2 times and nothing has fixed the problem. I am at the point now where I am seriously considering dropping AT&T for another TV/internet provider.

Here are some screenshots of UV Realtime from today and the past few days.

Here are some from the past few days.

[SomeJoe7777 ACE - Geek]

Definitely some kind of line problem.  Error table is a mess, max rate and attenuation are varying all over the place.  The weird pattern up in the 7-8 MHz range looks very odd -- might be a VRAD or port problem.

Please send a private message to Alex, one of our Community Managers.  He can get help get this issue solved.

[Computer-Joe ACE - Guru]

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SomeJoe7777 wrote:

Definitely some kind of line problem.  Error table is a mess, max rate and attenuation are varying all over the place.  The weird pattern up in the 7-8 MHz range looks very odd -- might be a VRAD or port problem.

Please send a private message to Alex, one of our Community Managers.  He can get help get this issue solved.

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Maybe provisioned to high for the distance, if the distance is acurate?

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How can you be in two places at once, when your not anywhere at all?
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I really want to become a procrastinator, but I keep putting it off.
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There are three kinds of people, those that can count, and those that can't.
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“Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man, and our politicians take advantage of this prejudice by pretending to be even more stupid than nature has made them." :Bertrand Russell

[Asir]

I sent Alex a PM and I should get in contact with someone today but since last night I havent experienced any signal lost but my readings seem odd now.

[tuxdave]

I've been getting very similar issues with my connection as well for the last year or so (was fine for the first couple of years).  I also PM'd Alex.

[tuxdave]

Lemme say i'm super pleased with the AT&T tech that came out and inspected the lines. He replaced quite a few ancient devices in our apartment network housing and now I'm 48hrs so far without any dropped network connections.  I don't understand the bitload picture much but I guess it looks much healthier.

BEFORE

AFTER

[ScottMac]

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Computer-Joe wrote:

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SomeJoe7777 wrote:

Definitely some kind of line problem.  Error table is a mess, max rate and attenuation are varying all over the place.  The weird pattern up in the 7-8 MHz range looks very odd -- might be a VRAD or port problem.

Please send a private message to Alex, one of our Community Managers.  He can get help get this issue solved.

---

Maybe provisioned to high for the distance, if the distance is acurate?

__________________________________________________________
How can you be in two places at once, when your not anywhere at all?
------------------------------------------------------------------------------------------------------
I really want to become a procrastinator, but I keep putting it off.
------------------------------------------------------------------------------------------------------
There are three kinds of people, those that can count, and those that can't.
------------------------------------------------------------------------------------
“Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man, and our politicians take advantage of this prejudice by pretending to be even more stupid than nature has made them." :Bertrand Russell

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VDSL2 will re-allocate bits dynamically toward the higher freq tones when it sees noise or interference on a given "tone" or group of tones (called bit-swapping). There is no provisioning of the raw bandwidth ... that's strictly a function of line length and quality. Bit-swapping is part of the "training" that occurs over several hours to days initially, and continues until the next power cycle (or modem reset).

Higher frequencies are attenuated (reduced) more as cable length increases, narrowing the available tones (toward the lower end). If there are no available destination bits to swap, you see a reduction of the raw bandwidth available ("Max Available Bit Rate - MABR)

When you reset the RG, you lose any training that may have occurred, which is not necessarily a Bad Thing.

There are profiles that are applied at the DSLAM (the access device in the VRAD): one is the user profile which assigns down/up bandwidth permissions and similar parameters, the other is a base training profile that assigns the default Power Spectral Density (PSD), which is the map of how the data is applied to the group of tones, subject to the bit-swapping that occurs over time.

[ScottMac]

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tuxdave wrote:

Lemme say i'm super pleased with the AT&T tech that came out and inspected the lines. He replaced quite a few ancient devices in our apartment network housing and now I'm 48hrs so far without any dropped network connections.  I don't understand the bitload picture much but I guess it looks much healthier.

BEFORE

AFTER

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There was a lot of AM radio interference (could also have had some HAM, commercial, or shortwave above 1.6MHz). Most of that has gone away, so I'd suspect that there was some repair to the cable, shields, or grounding system. If the protector or filter (in the NID  - the grey box on teh side of the building) has been hit a few times, they can also attenuate the signal enough for interference to have a much stronger effect.

There might have also been some repair back at the VRAD too.

[Computer-Joe ACE - Guru]

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ScottMac wrote:

VDSL2 will re-allocate bits dynamically toward the higher freq tones when it sees noise or interference on a given "tone" or group of tones (called bit-swapping). There is no provisioning of the raw bandwidth ... that's strictly a function of line length and quality. Bit-swapping is part of the "training" that occurs over several hours to days initially, and continues until the next power cycle (or modem reset).

Higher frequencies are attenuated (reduced) more as cable length increases, narrowing the available tones (toward the lower end). If there are no available destination bits to swap, you see a reduction of the raw bandwidth available ("Max Available Bit Rate - MABR)

When you reset the RG, you lose any training that may have occurred, which is not necessarily a Bad Thing.

There are profiles that are applied at the DSLAM (the access device in the VRAD): one is the user profile which assigns down/up bandwidth permissions and similar parameters, the other is a base training profile that assigns the default Power Spectral Density (PSD), which is the map of how the data is applied to the group of tones, subject to the bit-swapping that occurs over time.

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My mistake meant to say user profile is to high for available bandwidth/distance

__________________________________________________________
How can you be in two places at once, when your not anywhere at all?
------------------------------------------------------------------------------------------------------
I really want to become a procrastinator, but I keep putting it off.
------------------------------------------------------------------------------------------------------
There are three kinds of people, those that can count, and those that can't.
------------------------------------------------------------------------------------
“Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man, and our politicians take advantage of this prejudice by pretending to be even more stupid than nature has made them." :Bertrand Russell.