To: Lutz Moeller who wrote (903 ) 4/10/2000 10:52:00 AM From: Rob Preuss Respond to of 1762
Hopping The Gap. Fixed wireless may be a low-cost way to reach the business market. by Fred Dawson + Full Article; (April 2000 issue of "Communications Engineering & Design) cedmagazine.com + Excerpt about Ensemble Communications (a privately held company partly owned by, and in partnership with, DMIC): But the fact that Teligent, MCI, Sprint, NextLink and a host of other U.S. players in the wireless broadband space from MMDS (multichannel multipoint distribution service) at 2.5 GHz through LMDS (local multipoint distribution service) all the way to the 39 GHz tier have yet to announce suppliers for commercial rollouts of PMP systems has fueled a new wave of technology solutions from established and startup vendors who believe new approaches are needed if carriers hope to meet market demand. "The air links available up until now have not been sufficiently flexible to support the pricing and usage models that you need to compete in the real world," says Carlton O'Neal, vice president of marketing at San Diego- based startup Ensemble Communications Inc. Ensemble had originally expected that its product release in the second quarter of this year would put it in a catch-up mode against providers of previous generation equipment, but the failure of that equipment to take off and the resulting slow pace of wireless broadband rollouts has greatly improved Ensemble's prospects, O'Neal says. "It's not a great situation for the carriers, but it's great for us," he adds. Along with providing the mechanisms for dynamically assigning bandwidth at pre-set pricing levels, the Ensemble system provides support for bursting large quantities of data on top of the guaranteed service a given customer has signed up for, O'Neal explains. Because such bursts can be accommodated via unused portions of a given channel stream at any given moment, this means that operators can assure customers they'll have added bandwidth available when they need it, while maximizing the number of customers served by any one channel. O'Neal says other features of the Ensemble Adaptix air link protocol include use of adaptive time division duplexing, which allows variable rates of data to flow in both directions over a single channel; adaptive TDMA, which supports variable packet lengths to maximize burst rate bandwidth efficiency; and adaptive modulation, which provides for delivery of signals over the highest level of modulation that's feasible at a given moment in the fluctuating atmospheric environment of the transmission path. While Ensemble's system will register at about a six on a scale of one-to-10 in the pricing of wireless broadband systems, the overall cost of infrastructure based on its technology versus other systems will be much lower, owing to the flexibilities the company has built into the technology, O'Neal says. The system, which includes 64 QAM as one of the dynamically assignable modulation options, operates over any frequency tiers between 10 GHz and 43 GHz.