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Technology Stocks : Newbridge Networks -- Ignore unavailable to you. Want to Upgrade?

To: Bob Howarth who wrote (17328)	2/19/2000 11:45:00 AM
From: zbyslaw owczarczyk	Read Replies (2) \| Respond to of 18016

Bob, I found some more reading re:LMDS,MMDS in general higher frequency more bandwidth for example NexLink in US paid about 1 billion $ for lincense techweb.com " Is all this having much of an impact on LMDS rollout plans? Not much, according to Carlton O'Neal, vice president of marketing at LMDS startup Ensemble Communications Inc. (San Diego). As a licensed service having to deal with the hassles of line-of-sight antenna placement such as roof access to public buildings, LMDS technology was always anticipated to take longer to deploy than MMDS, O'Neal said. But its ability to scale to speeds common in the DSL and cable-modem worlds makes the service much more attractive than those in lower frequency bands, according to Ensemble" ------------------------ Data Communication article about Broadband Wireless: data.com "Also, because the unlicensed bands are available to anybody, performance can be lower if different providers choose to offer competing services in the same area. Two ISPs (Internet service providers) operating in the same coverage area could limit throughputs to half of what might normally be possible, for instance. And since there are no governing bodies overseeing unlicensed spectrum, the carriers have to figure out a solution. Still, in spite of these limitations, such services could be very attractive to smaller and medium-sized businesses because they?re very competitively priced. As for low-frequency bands that offer more bandwidth, there?s MMDS (multichannel multipoint distribution service), at 2.5 GHz. It has 200 MHz of bandwidth, and since it is a licensed band, interference from other providers is not an issue. A number of ISPs are using the MMDS band to target small and medium-sized businesses, in some cases relying on a hybrid approach?wireless for the downlink and PSTN (public switched telephone network) for the uplink. In general, lower frequencies translate into much larger coverage radii, as large as 35 miles. Both Sprint Corp. (Kansas City, Mo.) and MCI Worldcom Inc. (Jackson, Miss.) have acquired companies with MMDS spectrum so they can use wireless for the local loop. Higher frequencies (24 GHz or above) are sometimes called the millimeter wave band, because of the millimeter size of their wavelengths. These licensed bands are much larger, and at 28 GHz, the LMDS band, carriers have more than 1 GHz to work with. With modulations offering an effective throughput of 1 bit per second (4 QAM, or quadrature amplitude modulation) to about 4 bit/s (64 QAM) for every Hz of frequency, 1 GHz represents up to 4 Gbit/s of aggregated throughput (after coding overhead). However, this rate gets divvied up among customers and between neighboring cells or portions of cells called sectors. At these higher frequencies, connection distances shrink to about two miles. Since the bands are licensed, users should experience no interference.