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Summary of Contents for Viavi HST-3000
- Page 1 HST-3000 VDSL QUICK CARD WIDEBAND NOISE Revision 9.0 Technical Assistance: 1-866-228-3762 TAC@jdsu.com March 2012 © 2012 JDSU. All rights reserved.
- Page 2 V D S L 2 Q U I C K C A R D Wideband Testing - Wideband Noise Wideband Testing Defi nitions Before beginning description of the Wideband test feature found on the HST-3000 it is important the techni- cian has a basic understanding of two main principles. •...
- Page 3 V D S L 2 Q U I C K C A R D Wideband Testing Wideband Testing Defi nitions Noise: Noise can be considered any unwanted signal in the same spectrum of frequencies used by the XDSL technology. It is important for the technician to understand every cable pair has some measureable level of noise.
- Page 4 “dips” in the frequency response curve. Th e fact that a lower frequency has lower amplitude then a higher frequency Th e test can be performed using the HST-3000 in-conjunction with the UFED to send and Insertion Loss receive a .
- Page 5 Th is test is typically run from the customer premises to cross box. Procedure 1. Connect the Tip and Ring test leads from the HST-3000 to the desired pair. Connect the ground lead to a valid earth ground reference (con- nected to HST-3000 as shown in the fi gure on Page 4).
- Page 6 V D S L 2 Q U I C K C A R D Wideband Testing - Wideband Noise Purpose Wideband noise should be < -50dBm on VDSL loops. Th at means -90 to -50 dBm. NOTE : Th e YELLOW bridge cable allows for spectral reading across a working VDSL loop and is an optional high impedance cable.
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