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Comments on news posted 2008-04-23 18:25:20: Comcast and AT&T are engaged in a battle over in-home interference when both Comcast cable and AT&T U-Verse services are installed in the same premises. ..

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TKJunkMail
Enjoy the sun
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join:2002-03-03
Avalon, NJ
·Sprint Mobile Broa..
·Comcast


2 edits
 Could be solved by 3rd party investigation

The judge should assign a master to investigate. He could then hire some 3rd party network expert(from some university unaffiliated or tainted by corporate sponsors). And the problem identification could then be based on facts and not on mutual accusations.
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bogey780

join:2004-03-19
Here
Comcast just needs a scapegoat for their service issues. There'd be no reason for backfeeding to Comcast nor would the interference be unidirectional.


Jerm

join:2000-04-10
Richland, WA
I have no doubt this is actually happening...

It's the same kind of thing as if you were to hook a regular antenna directly up the CATV outlet - bad things happen.

I have no doubts stupid techs cross stuff all the time.


compugeek
I love making my own beer.
Premium
join:2002-07-30
Pickerington, OH
reply to bogey780
Re: Could be solved by 3rd party investigation

It isn't a scapegoat, I have seen it first hand on an analyzer.

Geek
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jt45

@comcast.net

reply to bogey780
and how do you know it is not causing problems. you dont know you just think you know. i agree with the first person . get a 3rd party in voled to look into this. you dont know that it is or is not causing a problem. you just like to think you know. stupid people!!!!!


justbits
More fiber than ATT can handle
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join:2003-01-08
Chicago, IL
·AT&T Midwest

reply to compugeek
So, is the interference being injected by installations where the HomePNA coax is accidentally left connected to the Comcast connection, or is it VDSL over POTS that's causing it?

Is it possible the enduser/customer is responsible for interconnecting the AT+T gateways that are using coax & Comcast coax networks?


justbits
More fiber than ATT can handle
Premium
join:2003-01-08
Chicago, IL
·AT&T Midwest

reply to Jerm
Re: I have no doubt this is actually happening...

My co-worker's neighbor had their Comcast box hooked up to their attic antenna, because the Comcast installer didn't bother to check if there was an attic antenna attached to the in-home coax. The installer should've known though since it was a new install. He could watch whatever they were watching by aiming his antenna at theirs and tuning in to channel 3.


Camelot One
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reply to justbits
Re: Could be solved by 3rd party investigation

According to the article, the problem arises when the customer mixes UVerse with cable internet. In that instance, the cableco line would NOT be disconnected. Both signals are being injected into the same wiring, and it's not hard to imagine one causing issues for the other. It sounds like the UVerse techs should be installing some sort of backstop signal filter, which would stop the uverse signal from traveling back up the cableco line feed.
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a333
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1 edit
reply to jt45
Well, if AT&T equipment were to interfere with Comcast, it would be logically implied that the Comcast signals are interfering with AT&T's equipment, right?

Or am I missing something here..........?

And please register on the forums before you post. Being anon really doesn't give you much credibility.


Camelot One
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join:2001-11-21
Sarasota, FL
clubs:

said by a333 See Profile :

Well, if AT&T equipment were to interfere with Comcast, it would be logically implied that the Comcast signals are interfering with AT&T's equipment, right?

Or am I missing something here..........?

And please register on the forums before you post. Being anon really doesn't give you much credibility.
I have to disagree that the interference would HAVE to effect both systems. You have to remember that the Comcast gear has been in place for years, while AT&T's gear was designed after the fact. It's quite likely the designers took into account that this problem might come up, and designed the UVerse gear to deal with it, or at the very least to ignore the interferring signal they knew might be an issue.

But yeah an anon from comcast.net defending comcast is a pretty tough sell.
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espaeth
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1 edit
reply to a333
said by a333 See Profile :

Well, if AT&T equipment were to interfere with Comcast, it would be logically implied that the Comcast signals are interfering with AT&T's equipment, right?

Or am I missing something here..........?
U-verse gear is one-directional on the coax side. It is DSL in, coax out. The impact on the U-verse side would be limited to the house that is hooked up wrong.

Comcast is 100% coax throughout the neighborhood.

If you connect a U-verse device to Comcast's cable plant you have the potential to affect everyone on that segment in the neighborhood.

I'm not sure why this would be limited to U-verse though; Verizon uses coax for FiOS as well, so one would have to imagine that this type of cross cabling has occurred on at least a handful of those installs as well.


Camelot One
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join:2001-11-21
Sarasota, FL
clubs:

The difference, and the reason VZ probably hasn't had to deal with this, is that there is no reason to have Fios but use cable internet. Maybe a select few using cable as a backup, but not nearly the number of customers who want UVerse TV/phone with the faster speeds of cable for the internet connection.

So there you have it, AT&T could avoid the problem all together by offering faster speeds so that they have a better than cable product, which would allow the install techs to disconnect the incoming cable co feed
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a333
A hot cup of integrals please

join:2007-06-12
Rego Park, NY
reply to espaeth
exactly, both FiOS and U-verse interface with coax in some way or the other. And one would think that Comcast would be quickest to lay blame to their biggest threat, which is Verizon FiOS, not U-Verse.
Peace,
a333


a333
A hot cup of integrals please

join:2007-06-12
Rego Park, NY

1 edit
reply to Camelot One
nevermind, misspost

cableguy619

join:2003-06-24
Chula Vista, CA

reply to bogey780
LOL OMFG... you serious? it is called if the customer chosies to keep both services the new service needs to run their own lines or a seperate line. if nto the only person affected will eb the customer in the end result. they need to be told up fron.. you need to make a choice or have another line rant o seperate the services...

cableguy619

join:2003-06-24
Chula Vista, CA

Bottom line

to lay it out in plain english.

Both Services work a majority of the same frequeny ranges and will affect one another in different areas depending on where they are carrying their services.

So a tech on either side can actually cause some kind of issue that will back feed into a providers system.


Samus82
Radly

join:2002-01-29
Chicago, IL
clubs:
·WOW Internet and C..

im a prem tech

We TAKE OFF comcasts drop and disconnect it from all of our wiring that we use. We dont use their splitters or anything. Most prem techs are trained very well to even cap off Comcasts lines with a terminator so it dosent just leak out.
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BK3

join:2001-04-10
Geneva, IL
·AT&T Yahoo

Good Corporate Citizen?

Comcast says:

.... AT&T should act like a good corporate citizen

Huh? AT&T a good citizen? The corp that would rather sue than negotiate in good faith? Like that's gonna happen.
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Answer Guy

join:2006-07-28
Grass Lake, MI

reply to cableguy619
Re: Bottom line

Yes, they both work in the same frequency and they do interfere with each other. However, the signal power level of the U-Verse is so much higher than the Comcast signal it easily over-powers it in the subscribers home. In fact, it could overpower the signal coming into the neighbors homes. Could it overpower the signal on the entire Comcast node, very doubtful.

Now, the real question is did AT&T do the bad installation, or did the homeowner do some modification without knowing the real impact. I've seen a lot of odd wiring jobs that some people do when they have no clue what they are doing.


GlobalMind
Domino Dude, POWER Systems Guy
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join:2001-10-29
Hollywood, FL

Comcast should talk

I love when one monolith PITA corporation tries to pull the moral high ground card with another monolith PITA corporation.

Comcast is about the last ones who should be calling out another company to be a "good corporate citizen."

In any event I can certainly see how this could happen if things aren't connected properly. Nevermind that it certainly seems that there aren't any measures in place to prevent the backfill of the Comcast network.
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