From Colby Instruments, Inc.

The JS-1000 is a high-performance, characterization / verification solution for testing electrical components or modules in optical transport communication systems with the utmost accuracy and repeatability. The solution is a tailored Phase Noise System that measures clock jitter characteristics in the 2.5G and 10G frequency ranges. JS-1000 was created for designers who want to differentiate their products on performance, time to market, or price, since the Performance Jitter Solution impacts all three. It allows you to characterize your products to SONET/SDH standards for Clock Jitter Generation, Tolerance, and Transfer. The JS-1000 goes beyond compliance testing to ITU-T 0.172 to offer ongoing competitive advantage in two areas
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Products & Services
Delay Lines
Delay lines are devices used to slow down a signal by a time interval in an electrical network. There are two basic delay line technologies: passive and active. 
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RF phase shifters are twin-ported devices that alter the phase of an output signal in response to an external signal.

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