Could Coax Hit 20 Gigabits Per Second?2010-10-01 11:15 by DanielaTags: DOCSIS, bandwidth, coax
There's estimated to be around 5 Gigabits per second of total capacity in a 750-MHz cable system. But if you crank up the frequencies to operate at up into the 3-Gigahertz range, "you could get up to 20 Gigs over the RF plant," says SCTE chief technology officer Daniel Howard. That's not symmetrical — that would be overall capacity — and it would be shared among all subscribers in a serving group. But whew… that is a ton of bandwidth that could still be wrung out of good ol' coax. It's why cable tech types like Comcast CTO Tony Werner suggest there may never be a need for MSOs to run fiber-to-the-home (see Fiber to the Home? Maybe Never, Says Comcast's Werner). The more urgent issue for MSOs is to increase the upstream capacity, which today is usually locked into the 5-42 MHz band (see Big Upstream Upgrades). Howard sees cable operators being able to offer 1-Gbps upstream connections in the next 8-10 years (i.e., two cycles of plant upgrades) by redeploying the upstream/downstream frequency split. Read more -here-
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