Nerdtalker
Working Hard, Or Hardly Working?
Premium,MVM
join:2003-02-18
Tucson, AZ
clubs:
| reply to ihaddsl
Re: 9 mbit might be in out future?!
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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GOLFnSUN
Enjoy the sun
Premium
join:2002-03-03
Avalon, NJ
 ·Sprint Mobile Broa..
 ·Comcast
| 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.
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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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J D McDorce
Premium
join:2001-12-29
Westland, MI | 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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hello123454
Premium
join:2002-02-02
Wilmington, DE
| 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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GOLFnSUN
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
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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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Nerdtalker
Working Hard, Or Hardly Working?
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join:2003-02-18
Tucson, AZ
clubs:
|  reply to GOLFnSUN
said by GOLFnSUN :
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 GOLFnSUN
said by GOLFnSUN :
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.
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GOLFnSUN
Enjoy the sun
Premium
join:2002-03-03
Avalon, NJ
·Sprint Mobile Broa..
·Comcast
| reply to Nerdtalker
said by Nerdtalker :
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.
Don't worry about that too much. The SB4200 can be upgraded to docsis 1.1 and that will be capable of plenty of extra speed for the next 2 years. Regardless of what you have read earlier in this forum, the upgrade to docsis 2.0 and the higher upload rates is very difficult and time consuming to do. Upgrading the CMTS is the easy part. Changing to higher upload rates will be very difficult. Because of the amount of hardware upgrades to the infrastructure to limit RF noise problems on uploads to get the higher speeds, even when docsis 2.0 is implemented, the very high upload rates that are theoretically possible won't be implemented. You will get your money's worth out of your current modem.
--
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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Nerdtalker
Working Hard, Or Hardly Working?
Premium,MVM
join:2003-02-18
Tucson, AZ
clubs:
|  said by GOLFnSUN :
said by Nerdtalker :
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.
Don't worry about that too much. The SB4200 can be upgraded to docsis 1.1 and that will be capable of plenty of extra speed for the next 2 years. Regardless of what you have read earlier in this forum, the upgrade to docsis 2.0 and the higher upload rates is very difficult and time consuming to do. Upgrading the CMTS is the easy part. Changing to higher upload rates will be very difficult. Because of the amount of hardware upgrades to the infrastructure to limit RF noise problems on uploads to get the higher speeds, even when docsis 2.0 is implemented, the very high upload rates that are theoretically possible won't be implemented. You will get your money's worth out of your current modem.
Phew, I was already getting my money out and counting pennies to pay for the 5100. |
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mbernste
Boosted
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join:2001-06-30
Piscataway, NJ
·Comcast
·Optimum Online
| said by Nerdtalker :
Phew, I was already getting my money out and counting pennies to pay for the 5100.
Actually, the 5100's are pretty cheap. In Best Buy they're selling them for $50 after rebate. I'm 99.9% positive that they will work on our system since they were mixed on the same shelf as the Comcast self-install kits.
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Nerdtalker
Working Hard, Or Hardly Working?
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join:2003-02-18
Tucson, AZ
clubs: | If I were to go purchase a 5100, what would I have to do to get them to remove my old one and provision the new one? I thought they didn't like to do that. |
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Qumahlin
Never Enough Time
Premium,MVM
join:2001-10-05
united state
| said by Nerdtalker :
If I were to go purchase a 5100, what would I have to do to get them to remove my old one and provision the new one? I thought they didn't like to do that.
You just call them and say I bought a new modem and need it provisioned
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Forum Posts:2800 |
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mbernste
Boosted
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join:2001-06-30
Piscataway, NJ
·Comcast
·Optimum Online
| reply to Nerdtalker
said by Nerdtalker :
If I were to go purchase a 5100, what would I have to do to get them to remove my old one and provision the new one? I thought they didn't like to do that.
Comcast wouldn't have any problem with you getting a new modem. Make sure your new modem is plugged in and has a solid connection. Then call Comcast and give them the MAC of your new modem. They'll (or at least they should) remove the MAC of your old modem and add/provision the new one. Just keep in mind that if you have a router and you cloned the MAC of your old modem, you will have to change those settings. At the very least a release/renew or reboot of your computer (if not going through a router) would be necessary.
In my case, when Comcast mailed me a new modem to replace my CyberSURFR, they forgot to remove the MAC of the old modem. Neither I or they realized that I had 2 modems on the account (only being charged for 1) until I switched to Pro and they had to re-build my account and reprovision my new modem (Terayon TJ 615).
If we ever do get multiple 5mbit connections to our house, it would be kind of cool to get close to maxing out the cable modem, wouldn't it?
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Finalnight
join:2002-05-10
Omaha, NE
clubs: | reply to mbernste
I noticed D-Link has a new modem, successor to the DCM-200
»www.dlink.com/products/modems/dcm201/ |
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