J D McDorce
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join:2001-12-29
Westland, MI | reply to GOLFnSUN
Re: 9 mbit might be in out future?!
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
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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
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join:2002-03-03
Avalon, NJ
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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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