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Spirent KB Article
Doc ID: FAQ14347
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Wireline: The noise levels and shape from the unit: DLS5103 are off how can I solve this problem?
The units of DLS5103/5104 are obsolete and un-repairable since they are too old and no part available.
The suggestion is that upgrading to the latest noise generator (it is DLS5800 please see attached for more information)
DLS-5800 NOISE GENERATOR/SEQUENCER SYSTEM
Product : Noise Generator