David
No,there is another.
Premium,VIP
join:2002-05-30
Granite City, IL
clubs:
 ·DIRECTV
 ·magicjack.com
 ·AT&T Midwest
| reply to KrK
Re: Thanks Comcast!
said by KrK  :Anyone from AT&T care to comment on approx. how much bandwidth an RT has? Because if you figure the TOP speed a user can get is around 8mbps down/1kup (and most much lower then that) then even if the connections were maxxed it would take a quite a few of them to overload the RT, me thinks. Well I will put it like this. The alcatel 7300 DSLAM for Central offices at bare minimum for management and program controls only takes an OC-12 (that's just management control). Consumer traffic management now a days to the DSLAMs is as least a OC-48 or better. I forget what the actual is but it was told to us if they activated the test DSLAM in our office and maxed out it's connectivity for the consumer side, it would only be at 1/2 the bandwidth of the connection required to connect to it. That's assuming all useable ports and shelves! They advised in training class you can max one out, but you are not meeting "minimum requirements" if you do.
Remote terminals are given 4 Fiber optic connections 1 Digital POTS + 1 DSL + 2 spares. I believe the connections currently to them are configured for OC-48 currently and with just a flip of a switch can easily be 192's. Hell the RT sends an alarm to the central office if the bandwidth ever hits 50%. The RT's send alarms for all kinds of things including fan problems, cooling problems, and even power problems.
Ironically the big problem for some RT's is they run out of ports for customers to connect to before they run out of bandwidth for one. I have never in my 7 years been here ever seen a bandwidth problem from an RT. I probably never will in my lifetime. The RT's have way more bandwidth than what they have ports for customers for. I mean it's something fierce on what those things have. From what I hear is some of the RT's now (and if you are close enough) will have Uverse capability right next to the DSL customers. Digital T1 customers and others even get provisioned out of there. One RT tech told me one day that he just got done turning up a DS3 connection from an RT. Those things are like lego blocks the possiblities are just endless.
Ironically they are working at the VRAD models to be the same way.
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If you have a topic in the direct forum please reply to it or a post of mine, I get a notification when you do this.
Koetting Ford, Granite City, illinois... YOU'RE FIRED!!
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KrK
Heavy Artillery For The Little Guy
Premium
join:2000-01-17
Tulsa, OK
·AT&T Yahoo
·AT&T DSL Service
 ·Cox HSI
·AT&T Southwest
| THANK YOU.
In other words, AT&T DSL kicks ass. The chances of you experiencing slowdown at the Node level pretty much approach zero.
Now... How about if you raise the speed caps some  |
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codee
Premium
join:2001-10-01
Minneapolis, MN
| reply to KrK
said by KrK :Now, typical Cable setup. Note the runs of coax from the node with tons of houses all on the same run.  'Nuff said, methinks.
Do you SERIOUSLY think that there are still 2000 homes on a node?? 1000?? I hope you are joking with that picture because that is ridiculous....that is a good example of maybe 1999. I don't experience any slowdowns no matter what time of day it is. On a side note, I am totally against any sort of specific limit being stated by Comcast. It would probably be lower then what I sometimes use anyways, I mean look at the limits of the ISPs who DO state what they are - they're pretty low. Some months I may need to use 300+ gigs, and some I may use 50-75 gigs. I haven't ever recieved a letter/warning/bad behavior slip for anything before, and I'm pretty sure the limits wouldn't be as high as 300+ gigs. I like it the way it is now with no set limit. |
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KrK
Heavy Artillery For The Little Guy
Premium
join:2000-01-17
Tulsa, OK
·AT&T Yahoo
·AT&T DSL Service
·Cox HSI
·AT&T Southwest
| I don't know how old that is, or how many homes are on a Node.
Perhaps a Comcast employee would care to comment?
Irregardless, however, whether it's 500 or 25, the point still stands.
They are all on one shared coax back to the node. If your neighbors are "hogging" the connection, it can get overloaded and slowed down.
Look this isn't a DSL vs Cable: Which is better bashfest. This is merely a description of the topographical differences of the systems, and lends itself to why there are or aren't caps and why they'd be necessary.
Peace.
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"Regulatory capitalism is when companies invest in lawyers, lobbyists, and politicians, instead of plant, people, and customer service." - former FCC Chairman William Kennard (A real FCC Chairman, unlike the current Corporate Spokesperson in the job!) |
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David
No,there is another.
Premium,VIP
join:2002-05-30
Granite City, IL
clubs:
·DIRECTV
·magicjack.com
·AT&T Midwest
| reply to KrK
I didn't even say anything about the underground vaults. Those are and could be C.O. 's just on their own.
You can still slow down at a node, it's possible but typically your DSL and your Pots to the RT would have problems. We have whats called a "streaming RT" condition where the RT just keeps sending fragmented packets to the C.O. header and you can send no packets back to the RT or they all fail. Typically a switchover can fix it, however every now and then they have to go to the RT and change cards.
Those repairs are typically less than 4 hours. 90% of the time they are replacing a card at the RT while they are there or switch to the backup card and route that way till permanent repairs can be made. If the RT goes down hard they drive and change.
Now the areas they typically don't have a lot of bandwidth would be say small towns with DSL and such. For instance, say ozora, mo. Town of about 5,000 people and maybe say 300-500 live in town. an OC-48 for those customers might be overkill by quite a bit. Most times here they deploy a big dslam there as a "Master controller" and the adtran Dslams as a slave controller or the customer's side. Now they don't keep a lot of bandwidth for DSL here, but then again, how many customers in a small town are you expecting? You are not going to have say 1000-3000 customers like downtown STL on a given part of town. I can see the point here would be if they are not using enough traffic to really peak a OC-12 why give them a 48? At that point it's just overkill.
I remember last year there was a few different small towns in wisconsin that were getting another OC-12 between them and chicago for backhaul. The one and only OC-12 they had was and finally hit 50%. Before the traffic peaked 65% they had another one turned up and divided the traffic in like 1/2. I remember he said he checked his work like 6 months later and the original OC-12 was at like 30% and the other one just cracked 22%. Now how long was it before the 2nd OC12 was even required, it was 2+ years out. Even then he had it on the books to make them both 48's. Even if he did one this year and one next year, he would still have enough bandwidth available. Now that we have at&t's legacy network and SBC's legacy network, it's going to be interesting how they integrate everything. I am watching the changes on this side of the fence and it's just phenomenal.
I just for kicks and grins looked at my local dslam's percentages. Ya know on patch Tuesday it hit 12%? It's average for the month is 7%. Some days like labor day and Christmas it's at like 0%. I have seen a few days with goose eggs on the report. I am sitting here thinking I would take a pic if it ever hit 50%, but then again, I wonder how long I will be waiting? Or if the equipment or me will be retired by the time it happens?
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If you have a topic in the direct forum please reply to it or a post of mine, I get a notification when you do this.
Koetting Ford, Granite City, illinois... YOU'RE FIRED!!
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KrK
Heavy Artillery For The Little Guy
Premium
join:2000-01-17
Tulsa, OK
·AT&T Yahoo
·AT&T DSL Service
·Cox HSI
·AT&T Southwest
| That's very good news. Awesome network management, really.
I'm very impressed. It's nice to know that if usage gets to 50% capacity the additional capacity is brought online.
It's overkill... in a great way. It's also pretty forward thinking. It suggests AT&T could deploy VDSL in a flash. Or break out more tiers. I guess the only thing that holds it back is the copper.
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"Regulatory capitalism is when companies invest in lawyers, lobbyists, and politicians, instead of plant, people, and customer service." - former FCC Chairman William Kennard (A real FCC Chairman, unlike the current Corporate Spokesperson in the job!) |
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mbkowns
Got Bandwidth?
join:2003-07-01
Riverside, CA
| reply to ninjatutle
I don't need to every provider does if you use enough of their resources and your payment doesn't justify it they will let you know. Since they don't offer the speed to get near some of those numbers its not as likely but it will happen.
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- MBK (AIM = IllMBKllI) |
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dMarks
Melting Faces For Fun
join:2007-02-09
Leslie, MI
 ·Millenicom
·HughesNet Satellit..
| reply to Rob
Can I ask you a question? How 'degraded' has your service been at it's worst? Seriously, I would like to know. I would like to compare your degraded speed to what my top speed is on HughesNet...just to see if you have something to complain about.
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HN7000S G16 - 970 MHz (currently)|Pro Plan|Windows XP Pro SP2|AMD Athlon 64 FX-57|2GB Dual Channel RAM|2x GeForce 7950 GT 512MB|250GB HDD |
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Rob
In Deo speramus, God Bless the USA
Premium
join:2001-08-25
Kendall, FL
·Comcast
| said by dMarks :Can I ask you a question? How 'degraded' has your service been at it's worst? Seriously, I would like to know. I would like to compare your degraded speed to what my top speed is on HughesNet...just to see if you have something to complain about. The worse my service has been is about 4mbps down and 700kbps up. Now I constantly get my standard 8mb down, and 74x up, and w/ powerboost around 12-15mb down. Thanks to Comcast for keeping their network working. |
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