Thread: ntl's plans for the future?
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Old 23-11-2004, 11:13   #7
ian@huth
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Re: ntl's plans for the future?
Very interesting article.

Wonder what some will make of the statement:

Upstream
†¢ The standard upstream spectrum is 5MHz to 65MHz using QPSK modulation in 3.2MHz channels
†¢ Upstream capacity is 5.12 Mb/s per 2000 homes
†¢ QAM 16 could increase this to 10.24 Mb/s to each home
Downstream
†¢ The standard downstream spectrum is 85MHz to 750MHz using QAM 64 modulation in 8MHz channels
†¢ 80 downstream channels are available
†¢ Each downstream channel can support 38Mb/s of downstream data (Broadband and TV)
†¢ Maximum downstream capacity is 80 x 38Mb/s = 3.04Gb/s delivered to each home
†¢ QAM 256 modulation could increase this to 4Gb/s to each home
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