TechnoScott
Premium
join:2003-03-25
00000
| reply to mbernste
Re: 9 mbit might be in out future?!
Have you ever stopped to think why NO cable isp currently (except for a small one I know of in brazil who just opened plant and all and only has a cpl hundred customers) uses QAM upstream?
I have thought of this.... the reason is this: Nationwide, maybe 200-300 maintenance people in ALL cable companies actually have the training, skills, and abilities to pull it off. That was the point I was trying to make. The cable providers need more than just training... they need knowledge and innovative techs who can get the job done. |
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Nerdtalker
Working Hard, Or Hardly Working?
Premium,MVM
join:2003-02-18
Tucson, AZ
clubs:
| reply to Qumahlin
said by Qumahlin  :
You won't see a 1.1 conversion, and if you did it wouldn't matter as 1.0 modems are backwards compatible. plans as of now are to jump to 2.0 and slowly replace those users who have 1.0 and 1.1 modems.
I have an SB4200 modem, is that going to be replaced by the cable company with a "complimentary" modem or am I going to be forced to purchase another $100 dollar modem so I can continue getting access? |
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ihaddsl
join:2001-12-05
/dev/hda0
 ·Comcast
| said by Nerdtalker :
said by Qumahlin :
You won't see a 1.1 conversion, and if you did it wouldn't matter as 1.0 modems are backwards compatible. plans as of now are to jump to 2.0 and slowly replace those users who have 1.0 and 1.1 modems.
I have an SB4200 modem, is that going to be replaced by the cable company with a "complimentary" modem or am I going to be forced to purchase another $100 dollar modem so I can continue getting access?
If you own your modem, it would likely be up to you to get a new compliant one if this becomes a requirement. If you lease, comcast will supply you with a new one
--
War has no winners, only losers |
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Nerdtalker
Working Hard, Or Hardly Working?
Premium,MVM
join:2003-02-18
Tucson, AZ
clubs:
| said by ihaddsl :
said by Nerdtalker :
said by Qumahlin :
You won't see a 1.1 conversion, and if you did it wouldn't matter as 1.0 modems are backwards compatible. plans as of now are to jump to 2.0 and slowly replace those users who have 1.0 and 1.1 modems.
I have an SB4200 modem, is that going to be replaced by the cable company with a "complimentary" modem or am I going to be forced to purchase another $100 dollar modem so I can continue getting access?
If you own your modem, it would likely be up to you to get a new compliant one if this becomes a requirement. If you lease, comcast will supply you with a new one
What are they going to do if I don't get a new one? |
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mikedz4
join:2003-04-14
Weirton, WV
 ·DIRECTV
 ·Verizon Online DSL
 ·Comcast Digital Vo..
·Comcast
| reply to Qumahlin
you're wrong. 2.0 conversion won't come until next year. 1.1 is coming this year. Which means they will have to replace my 1.0 modem.
from multichannel.com
"In fact Comcast has encountered some "good" surprises, according to Fellows — such as the old Tele-Communications Inc. plant that actually had been rebuilt to 750 Megahertz, but had been mislabeled as less than that.
The typical Comcast plant is rebuilt for 860 MHz with 860-home nodes, he said.
Even a 750-MHz plant can offer 84 analog channels, 216 digital channels and eight channels for HDTV, Fellows said.
Across a 1,000 home neighborhood, that 750-MHz plant could handle VOD for 400 digital subscribers, 400 high-speed-data homes and 300 telephone subscribers, with three 6-MHz slots still left over.
"If we need more capacity, we can split up nodes four ways" and provision the forward and reverse path separately, depending on the capacity required, said Fellows.
Comcast is upgrading all of its DOCSIS 1.0 plant to DOCSIS 1.1 this year, he said. "We have DOCSIS 2.0 in our back pocket, which would give us five times the speed upstream."
Voice-compression advancements are also on tap in the circuit-switch telephony operations Comcast inherited from AT&T. Technology exists to take the voice compression from 64 kilobits to 16 kilobits, allowing Comcast to carry four times as many phone calls on a single line.
Fellows also talked about Comcast's digital transition plans. Comcast could go to 100% digital for its cable network carriage and keep must-carry and retransmission-consent channels in the analog domain, he said.
Such a transition would give Fellows 60 to 80 6 MHz slots to use for other services.
"
»www.multichannel.com/index.asp?l···hResults |
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TKJunkMail
Enjoy the sun
Premium
join:2002-03-03
Avalon, NJ
 ·Sprint Mobile Broa..
·Comcast
| reply to Nerdtalker
said by Nerdtalker :
What are they going to do if I don't get a new one?
Your old modem would continue to work as the newer CMTS would work with all older cable modems, even if they are using docsis 1.0 or 1.1. But if you wanted to take advantage of the new capabilities, you would have to buy a new docsis 2.0 modem. That is part of the tradeoff you must consider when making the rent/buy evaluation on a cable modem. BTW, the SB4200 is downloadable microcode upgradeable to docsis 1.1, but not 2.0.
--
I found out that all the important lessons of life are contained in the three rules for achieving a perfect golf swing: 1.Keep your head down - 2. Follow through - 3. Be born with money |
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degauss1
join:2001-07-02
Hillsboro, OR
·ViaTalk
 ·Verizon FIOS
·Comcast
·Axvoice
| reply to TechnoScott
said by TechnoScott :
...From where I sit the whole issue is a matter of money.... Everyone is too afraid to spend some capital to make money in the long run.
Ain't that the truth. That goes for the telco's too. IF Comcast has the foresight to spend, take the risk and fly with new technology and FINALY provide real broadband data services then they deserve to be the king of the heap. It could be quite a different story if the telco's beat them to the punch and spent some cash on more infrastructure (personally dreaming of fiber to the house) and offered better reach for high-speed connectivity. |
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J D McDorce
Premium
join:2001-12-29
Westland, MI | reply to TKJunkMail
Could you give a description of what capabilities that a user would see by using a DOCSIS 2.0 modem on a DOCSIS 2.0 system versus using a DOCSIS 1.0 modem on a DOCSIS 2.0 system? |
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Kommie
join:2003-05-13
East Haven, CT | reply to mbernste
Some Comcast nodes are already 1.1. Philadelphia is and some ATT Areas where digital phone is offered. |
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ihaddsl
join:2001-12-05
/dev/hda0
·Comcast
| reply to degauss1
said by degauss1 :
said by TechnoScott :
...From where I sit the whole issue is a matter of money.... Everyone is too afraid to spend some capital to make money in the long run.
Ain't that the truth. That goes for the telco's too. IF Comcast has the foresight to spend, take the risk and fly with new technology and FINALY provide real broadband data services then they deserve to be the king of the heap. It could be quite a different story if the telco's beat them to the punch and spent some cash on more infrastructure (personally dreaming of fiber to the house) and offered better reach for high-speed connectivity.
*everything* is just a matter of money at the end of the day, just that it isnt' always available to spend where you might like.
Comcasts debt load is somewhere north of 20 billion dollars, until they do something about this they aren't in a position to spend willy nilly to upgrade their plant
--
War has no winners, only losers |
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hello123454
Premium
join:2002-02-02
Wilmington, DE
| reply to J D McDorce
From - »www.cedmagazine.com/ced/2002/0202/02e.htm
DOCSIS 2.0 systems will allow a larger RF channel size (6.4 MHz). This will lead to better statistical multiplexing and optimal use of bandwidth. Ultimately, this translates to a higher symbol rate (up to 5.12 Msymbols/s) and three times the throughput achieved by 1.1 systems (up to 30.56 Mbps). Additionally, the physical layer technology makes the DOCSIS 2.0 system more resilient to noise. In addition to bandwidth, this is a key characteristic for high-quality videoconferencing.
The greater noise resilience of DOCSIS 2.0 systems better ensures reliable service delivery, a major consideration for videoconferencing, telephony and other services being marketed to SOHO and small business users, who demand reliability. The new modulation schemes in DOCSIS 2.0 allow MSOs to compete effectively with alternate service providers. For instance, DOCSIS 2.0 calls for channel equalization, which will protect against channel non-linearities. DOCSIS 2.0 also adds improved forward error correction (FEC) in S-CDMA and A-TDMA, as well as Trellis-Coded Modulation (TCM) in S-CDMA, which provides additional error correction capabilities. Additionally, the spread-spectrum nature of S-CDMA provides enhanced resistance to impulse noise, a common cause of performance degradation.
A little more then we need to know 
[text was edited by author 2003-05-29 16:00:06] |
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TKJunkMail
Enjoy the sun
Premium
join:2002-03-03
Avalon, NJ
·Sprint Mobile Broa..
·Comcast
| reply to J D McDorce
said by J D McDorce :
Could you give a description of what capabilities that a user would see by using a DOCSIS 2.0 modem on a DOCSIS 2.0 system versus using a DOCSIS 1.0 modem on a DOCSIS 2.0 system?
Docsis 1.1 chgs from docsis 1.0
»www.cablemodem.com/faq/#FAQ17
Docsis 2.0 chgs from docsis 1.1
»www.cablemodem.com/faq/#FAQ19
DOCSIS 2.0 is backward compatible with earlier versions of DOCSIS products, fully supporting advanced Internet Protocol (IP)-based cable services. It adds advanced digital modulation capabilities to cable modems and headend equipment enabling cable companies to increase by a factor of three the speed of the return (or upstream) path of their networks as compared to DOCSIS 1.1, or a factor of six as compared to DOCSIS 1.0.
Here ia a great article explaining all the docsis standards, speeds, and implementation challenges:
»www.commsdesign.com/design_corne···116S0006
--
I found out that all the important lessons of life are contained in the three rules for achieving a perfect golf swing: 1.Keep your head down - 2. Follow through - 3. Be born with money |
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pcg33k
join:2002-10-20
Everett, WA | reply to mbernste
I am happy that comcast is going to go faster ,i don't care what it cost $99.99 a month lets do it .
5 meg down 786 up , Please :} |
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outtherenost
Victim Of Changes
join:2001-05-30
Corona, CA | quote:
i don't care what it cost $99.99 a month lets do it
Uuuuuuhhhhhhhh...No!!!
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Kommie
join:2003-05-13
East Haven, CT
| reply to pcg33k
said by pcg33k :
i don't care what it cost $99.99 a month lets
Someone has money to burn I see |
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VTboy
@pacbell.n | reply to mbernste
I know for a FACT that comcast and all other Cable Companies use QAM for there HDTV. |
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J D McDorce
Premium
join:2001-12-29
Westland, MI
| They use QAM on the download side for internet, also. The question is whether anyone in the US is using QAM on the upload side for internet (versus QPSK).
While I am no expert, I can't see a reason for a QAM return path for HDTV.
[text was edited by author 2003-05-29 17:13:59] |
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Nerdtalker
Working Hard, Or Hardly Working?
Premium,MVM
join:2003-02-18
Tucson, AZ
clubs:
|  reply to TKJunkMail
said by TKJunkMail :
said by Nerdtalker :
What are they going to do if I don't get a new one?
Your old modem would continue to work as the newer CMTS would work with all older cable modems, even if they are using docsis 1.0 or 1.1. But if you wanted to take advantage of the new capabilities, you would have to buy a new docsis 2.0 modem. That is part of the tradeoff you must consider when making the rent/buy evaluation on a cable modem. BTW, the SB4200 is downloadable microcode upgradeable to docsis 1.1, but not 2.0.
Does that mean I'll only see speeds like the ones I have if I stay with the 4200 and will only be able to get the higher speeds if I buy a 5100? That really stinks. |
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mikedz4
join:2003-04-14
Weirton, WV
·DIRECTV
·Verizon Online DSL
·Comcast Digital Vo..
·Comcast
| well look at this it's a typo on a comcast website.
»ads.pittsburghlive.com/richads/c···dex.html
"**Speed comparisons are for downloads only and are compared to 56Kmodems and 640K. Upstream 356kbps. Actual speeds may vary. Many factors affect download speed. Ask about speed when you call or visit www.comcast.com Installation fees apply. "
notice the big typon that says "upstream 356kbps."
I wonder how many people actually caught this typo and called comcast on it and would they have a case for a false advertising suit? |
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mbernste
Boosted
Premium,MVM
join:2001-06-30
Piscataway, NJ
·Comcast
·Optimum Online
| reply to TKJunkMail
said by TKJunkMail :
BTW, the SB4200 is downloadable microcode upgradeable to docsis 1.1, but not 2.0.
Just one of the nice advantages of having a TJ615. It is 1.1 compliant and flash upgradeable to 2.0 (has all the necessary hardware components). I suspect that was one of the reasons why Comcast decided to go with Terayon when they did their modem upgrade program last August.
On a side note, when Comcast did the modem upgrade, anyone who bought their cable modem, got a new one from Comcast for free. Additionally, the replacement modem (according to the letter) was considered owned my the subscriber. Those who rent, continued to rent.
--
Cable survey results: »mywebpages.comcast.net/mbernste/···rvey.htm
Uncensored Comcast Group »groups.yahoo.com/group/comcast_cable
Watch Comcast execs get grilled »mywebpages.comcast.net/mbernste/···ing.html |
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