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Wireless connects Paraguayan community.

When the public service telephone network failed to respond, a Florida firm answered the call.

Residents of the small farming community of Pirapou in Paraguay had been with out basic telephone service for some time. Asuncion, Paraguay's capital, had 80% of the country's telephone service. Rural areas such as Pirapou were seriously underserved.

The nation's government authorities desired local area switching and wireline and wireless capabilities all in one complex. Due to variations in Paraguay's El signaling conventions, however, systems slated for the Pirapou region were often incapable of connecting to the public service telephone network (PSTN).

Even though Paraguay permits private sharing of wireless services, potential service providers were discouraged from supporting the Pirapou region because of a number of factors. These factors included the low population count, which made the infrastructure's profitability impossible for most vendors. Even with wide area coverage, high reliability with entry-level port capacities was required by the infrastructure--a serious cost item. Another obstacle for most vendors was the requirement for the supplementary services to have a format consistent with the PSTN in order to achieve proper interfacing.

Paraguay turned to the Phoenix Wireless Group, Maitland, Fla., which intended to master these problems by employing the ONE Architecture of the Excel Switching Corp., Hyannis, Mass. Phoenix Wireless installed its Phoenician wireless local loop system in Pirapou. This, in effect, acted as an extension to the existing PSTN. The resultant network extends over a 50-kilometer radius and switches all local calls. Long-distance calls are sent to Asuncion. The Excel EXS switching platform was employed, sharing space in a microwave repeater station.

Three months after being ordered, the system went online with 100 fixed wireless and 30 wireline users. Phoenix Wireless was aided in this rapid deployment by using Excel's programmable protocol language (PPL), which cuts down implementation time by providing a graphical switch-software environment. More note-worthy was that Phoenix engineers, using PPL from their Florida headquarters, were able to integrate the new system with the PSTN in less than two days, in spite of Paraguay's E1 signaling protocol not matching Phoenix Wireless's specifications.

Excel's PPL enabled the engineers to identify the signaling differences and modify the protocol variations, thus enabling the PSTN integration to take effect easily and quickly. In addition, Excel's service creation conditions allowed Phoenix to reproduce interoperability with the PSTN's supplementary services.

Moreover, Excel EXS's modularity enabled Phoenix to reduce network costs, providing residents with feasible economical service and its provisioning in the Pirapou region. The area's residents now enjoy being in contact with the rest of the world, unaware of precisely how it was accomplished. Circle 270 for more information from Phoenix Wireless Group

Wireless local loop fundamentals

Wireless local loop (WLL) is a method, of connecting users to the public service telephone network (PSTN) by means of radio signals-just for the "last mile." This requires a radio receiver be installed at the user's premises to receive signals from the closest telephone central office. Thus, telephone network access is achieved without running copper cable. Compared to copper wiring, the WLL technique appears to provide reduced installation costs.

Benefits of WLL applications as compared with wired ones are:

* WLL avoids the difficulties of installing wire and cable in certain regions, such as those with adverse terrain and buildings;

* WLL has easier, less costly maintenance and more readily achieved protection from the elements;

* A greater speed of installation occurs with WLL;

* WLL has higher transmission bandwidth; and

* Costs of WLL applications are lower.

Initially, most WLL users are anticipated to be located in emerging countries-that is, those countries with a limited infrastructure. Some forecasts predict that by 2003, WLL subscribers will total 340 million. The technology will essentially be an adjunct to plain old telephone service (POTS) because of of WLL's comparable installation ease and low cost.

In developed countries, the attraction will be to companies that want to by-pass the established local phone service. A further appeal of WLL is the large bandwidth (about 10 GHz) for multimedia applications.

Wireless communications have displayed some problems. One is impedance matching, brought on by an unpredictable terminating impedance. Another is echo cancellation, wherein the echo is caused mainly by an impedance mismatch between the user's terminal and the central network. The enormous potential of wireless local loop systems in both emerging and developed countries, however, is expected to overcome these early problems.
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Article Details
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Title Annotation:Technology Information
Comment:To be able to offer telephone service to residents of Pirapou, Paraguay, the government turned to the Phoenix Wireless Group for help.
Author:Sarch, Ray
Publication:Communications News
Geographic Code:1USA
Date:Jun 1, 2000
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