Precision Noise Source Checks DSL Modems

Sept. 29, 2004
Consisting of precision dual-output noise sources and sophisticated control circuitry, the model UFX-9835 test source from Noise Com (Parsippany, NJ) is designed to generate near-end crosstalk (NEXT) and far-end crosstalk (FEXT) for production ...

Consisting of precision dual-output noise sources and sophisticated control circuitry, the model UFX-9835 test source from Noise Com (Parsippany, NJ) is designed to generate near-end crosstalk (NEXT) and far-end crosstalk (FEXT) for production testing of DSL modems. Suitable for evaluating ADSL, HDSL, and xDSL equipment, the high-performance source provides frequency coverage of 50 Hz to 2 MHz with a 3-dB output bandwidth between 3 and 5 MHz. Each of the two independent noise generators can be controlled for output levels from -140 to -130 dBm/Hz, allowing for simultaneous testing of NEXT and FEXT. The two outputs are each balanced with output impedance higher than 10,000 ohms, which meets the high-impedance crosstalk injection requirements of various T1 standards. The rack-mount instrument boasts high-crest-factor noise outputs, with a peak-to-average ratio of better than 5:1.

NoiseCom --> http://lists.planetee.com/cgi-bin3/DM/y/eA0DJhN60Gth0BEdP0Au

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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