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bobjohnson
Premium
join:2007-02-03
Orlando, FL
Reviews:
·AT&T U-Verse
·T-Mobile US
·Sprint Mobile Br..
reply to deepwoods

Re: [Speed] new "Performance Promo" is mostly unusable

So in short... You got the lineman for the job... Cool. I can mostly summarize in layman's terms. The shunt (attenuator) was there because there was a hot (or bad) 760mhz tap somewhere upstream and your signal was too high. The original installer put a band-aid on the issue which doesn't work with D3 as well as it does with the older Docsis specs, if at all. Your channels rotate frequencies depending on the demands of that particular system and one or more of your area's downstream channels are outside of that 760mhz range therefore throwing your whole system off balance and probably was not bonding because of the bad channel...
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Cheese
Premium
join:2003-10-26
Naples, FL
kudos:1

Come on man, it was congestion!


deepwoods

join:2011-07-07
Berkeley, CA

In speaking with the tech, he said until around 2 months ago, it WAS congestion as they added two channels at that point. Now it is not, and he pretty much assured me of that.

If you are "inside" you can research this. Santa Cruz,CA was only upgraded a couple of months ago. Prior to that is was apparently fugly.

I only found this out today. I've overjoyed that we do not have congestion.

But in the absence of facts, versus conjecture, how would YOU depict time of day cratering? Just asking.



Cheese
Premium
join:2003-10-26
Naples, FL
kudos:1

I was making fun of your original stance that it couldn't be anything BUT congestion. I guess I should have put the sarcasm tag on my post.


deepwoods

join:2011-07-07
Berkeley, CA

It's all good. No harm, no offense.

But I have been frustrated by lack of facts. I'm hoping a root cause is within reach.



Cheese
Premium
join:2003-10-26
Naples, FL
kudos:1

That would be nice



NetFixer
Snarl For The Camera Please
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
·Comcast
reply to deepwoods

said by deepwoods:

But in the absence of facts, versus conjecture, how would YOU depict time of day cratering? Just asking.

One simple explanation is that time of day can also mean temperature changes. Those temperature changes cause expansion and contraction which can cause connection problems (especially with loose or corroded connections). Temperature changes also mean resistance changes in the coax and in other components in the connection, and that can also have an effect.

You have to remember that the actual signals are analog, not digital (that is why you have to use a modem*), and anything in the path that causes the analog signal strength or quality to vary, can produce unpleasant results on the digital and IP side of things.

* »en.wikipedia.org/wiki/Modem
quote:
A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog signals, from light emitting diodes to radio.

--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:9

Also, there may be something (some kind of machinery / equipment) that may be kicking on at around the same time in the neighborhood (close proximity to cable lines / hardware) that may be injecting noise in to the system..



bobjohnson
Premium
join:2007-02-03
Orlando, FL
Reviews:
·AT&T U-Verse
·T-Mobile US
·Sprint Mobile Br..
reply to deepwoods

said by deepwoods:

In speaking with the tech, he said until around 2 months ago, it WAS congestion as they added two channels at that point. Now it is not, and he pretty much assured me of that.

That's what DOCSIS 3.0 is supposed to do. Provide faster speeds and add more bandwidth for everyone.
said by deepwoods:

If you are "inside" you can research this. Santa Cruz,CA was only upgraded a couple of months ago. Prior to that is was apparently fugly.

I understand the system but have no association with Comcast.
said by deepwoods:

But in the absence of facts, versus conjecture, how would YOU depict time of day cratering? Just asking.

Actually, technically speaking it is or was congestion causing your slowdowns. The problem isn't a congested node though. Even though they added channels your modem and the areas modems weren't able to use all of them so the root cause of the problem was actually in your neighborhood's lines but once everyone started using them there weren't enough usable channels to provide everyone with enough bandwidth to stay at speed, as the tech said he could see the ups and downs on the whole node. Since they are able to utilize all the available channels you shouldn't have the issue anymore.

edit: I can't spell.
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linetech

@verizon.net
reply to bobjohnson

where do you get the 760 number from? amps are 750 or 860. taps are 1000mhz.

said by bobjohnson:

So in short... You got the lineman for the job... Cool. I can mostly summarize in layman's terms. The shunt (attenuator) was there because there was a hot (or bad) 760mhz tap somewhere upstream and your signal was too high. The original installer put a band-aid on the issue which doesn't work with D3 as well as it does with the older Docsis specs, if at all. Your channels rotate frequencies depending on the demands of that particular system and one or more of your area's downstream channels are outside of that 760mhz range therefore throwing your whole system off balance and probably was not bonding because of the bad channel...



bobjohnson
Premium
join:2007-02-03
Orlando, FL
reply to bobjohnson

The anon is correct btw. It would be the amp that I was talking about. A 750 amp but I can't see very well on my tablet so sometimes I just guess