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Technology Stocks : p-com (pcms) -- Ignore unavailable to you. Want to Upgrade?

To: JakeStraw who wrote (1411)	5/17/2000 11:29:00 PM
From: RMMOYER	Respond to of 1461

The Hill is back on board, PCMS, The truck has been backed up , semi loaded ,shifting for second gear, getting ready for the big TEN , LONG or you're WRONG.

To: JakeStraw who wrote (1411)	5/20/2000 2:00:00 PM
From: Elmer Flugum	Read Replies (1) \| Respond to of 1461

The 10 Hottest Technologies telecoms-mag.com "Time Division Duplexing: Maximizing Spectrum Like the CDMA-TDMA-GSM debate in mobile wireless networks, a similar battle is brewing in fixed wireless: frequency division duplexing (FDD) vs. time division duplexing (TDD). But unlike the mobile world, action in the local multipoint distribution service (LMDS) spectrum, with the exception of two or three notable carriers, has been a case of all talk and less-than-widespread deployment. Air interface standards, currently being worked on in the IEEE?s 802.16 committee to deal with issues such as interference and interoperability, could help change that, propelling broadband wireless to a $7.4 billion market for services by 2003, according to the Strategis Group. The deployment of TDD systems could be a big boost to the market as well. While the major broadband wireless deployments from Winstar and Teligent have been tried-and-true FDD, these and other carriers, such as NextLink, are taking a close look at TDD for its spectral efficiency capabilities. TDD, which is being backed by start-ups Ensemble Communications and WavTrace, was designed with data traffic--asymmetrical and ?bursty? by nature--in mind. TDD uses a single channel for simultaneous, two-way communications. Separation between the transmit and receive functions occurs in the time domain rather than by frequency (as in FDD). With TDD the radio?s uplink and downlink operate on the same frequency, but at different times at a fixed interval and the amount of bandwidth allocated to each direction is flexible. This circumvents the need for a large guard band to isolate the upstream and downstream traffic, increasing the efficiency of the spectrum. The LMDS spectrum is quite large, so efficiency is not currently a factor: If service providers have both A and B band channels in a market that?s a total of 1150 MHz of spectrum, equivalent to about 200 video channels. ?Service providers are really just starting to sign on customers, so it?s not an issue just yet,? said Andy Fuertes, senior analyst with Allied Business Intelligence. ?But going forward, as broadband wireless catches on, then carriers may be thinking a lot more about spectral efficiency.? Just as analysts believe there?s enough room for broadband access and mobile wireless via several technologies, so do they think there?s room for both FDD and TDD. Whether TDD has a compelling enough story to dominate the market is up in the air, but the interest being paid to the technology is positive. NextLink, the largest LMDS spectrum holder in the country, has chosen WavTrace for its Los Angeles trial along with three other vendors. The start-up also has a strong relationship with Harris Corp., which owns nearly 20 percent of the company. Ensemble has strategic marketing alliances with Digital Microwave and ADC. "