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Wireless HD video: Raising the UWB throughput bar (again)
This article reviews the promise and technical challenges facing UWB, reports on the most recent test results, and analyzes a particular approach to UWB. It also discusses the throughput and encryption considerations for HD video distribution. view report.pdf

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802.11n interoperability performance test
Independent performance testing to date has used client-AP pairs based on chipsets from the same vendor. But, with the complexity of 802.11n specification and many optional features in the emerging standard, throughput between different chipset implementations may be unpredictable. get this report (registration required)

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Comprehensive UWB tests give video a green light but caution on wireless USB
With 22 UWB based Wireless-USB products being certified, it’s time to evaluate UWB technology. While most WiMedia Alliance entries ran at less than 10% of the 480 Mbits/s PHY rate over short distances, Pulse-LINK’s CWave technology was fast enough for multiple HD video streams over good distances. view report .pdf

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Report: Tests show 802.11n outperforming 802.11g
Wireless LAN systems based on draft-compliant IEEE 802.11n chipsets from four vendors are significantly outperforming 802.11g-based systems—although with notable variations between products. Since the Wi-Fi Alliance began certifying draft 802.11n products on June 25, the number of certified devices has been growing steadily and is now over 50. The Wi-Fi Alliance expects these products to interoperate and to deliver approximately twice the range and five times the throughput of legacy 802.11a/b/g networks. view report .pdf or view report URL

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WireScope 155 Accuracy Analysis
Category 5 cabling is the key enabling technology for bringing high speed networking to the desktop. In order for installers and users of category 5 cabling plants to be sure that each cabling run can deliver high performance service, it is necessary to test cabling performance parameters in the field. The draft TIA TSB-67 specification for field testing defines the required test functions, test configurations, and minimum tester accuracy necessary to reliably certify category 5 cabling in the field. TSB-67 defines two measurement accuracy levels and the instrument design parameters required to meet these overall measurement accuracy ranges. Annex A of the draft TSB-67 specification defines a mathematical model relating the overall accuracy of a field test instrument to measurable instrument error parameters. Using this model, it is therefore possible to obtain overall accuracy of a field tester from data which can be measured using laboratory equipment. This article describes the application of the TSB-67 accuracy analysis to design qualification and production testing of the WireScope 155 field cable tester. Inchcape Testing Services, ETL Testing Laboratories audited the process of measurement and collection of the data presented in this analysis. view report .pdf

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155 Mb/s ATM Bit Error Rate Test
This test demonstrates how the characteristics of an ATM channel above 100 MHz affect the robustness of 155 Mb/s ATM network. A series of Bit Error Rate (BER) measurements were performed on two category 5 channels that have similar properties up to 100 MHz but differ above 100 MHz in that one of the channels has a defect at 124 MHz. The channel with the defect above 100 MHz but that nevertheless passed the category 5 certification, exhibited BER of 9.6 x 10-8, which significantly violates the maximum BER of 10-10 specified by the AF-PHY-0015.000 ATM Forum standard. By contrast, the channel with consistent behavior up to 155 MHz exhibited BER of 1.1 x 10-11. view report .pdf


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