Delays through block upconvertors and the cable itself vary depending on time of day and outside temperature. These dynamic variations can present particular challenges to some methods that depend on precise phase relationship between adjacent frequency channels and between adjacent symbols. DWMT is not only sensitive to timing differences be-tween subscribers, it is also sensitive to RF carrier phase offsets between subscribers. First, it reduces the amount of upfront investment and ongoing maintenance costs required to support two-way data service in existing plants, thus accelerating service uptake in more serving areas. Higher channel efficiency means more bandwidth is available to support more revenue-generating traffic.
Cable operators can increase the revenue generated by existing upstream spectrum by fourfold.
About the author Rod Gross is VP of marketing with Ultracom Communications. CED is a registered trademark of Cahners Business Information . All contents copyright Cahners Business Information. All rights reserved.