990DSL
Users Guide
5-12
Figure 5-7 shows the detailed Loss results for a typical pair.
acy59s.eps
Figure 5-7. DSL Auto-Test Loss Results: All Service Types
To rapidly qualify all service types but ADSL2+ and VDSL in a single pass,
the CopperPro measures the Nyquist frequency loss of each Service Type,
along with other parameters. Each vertical bar in the above figure corresponds
to the Nyquist (maximum energy) frequency of a given Service Type. HDSL,
HDSL2, and HDSL4 services are all qualified in this test at the same
frequency (196 kHz), but have separate Pass thresholds. ADSL2+ and VDSL
Service Types must be qualified individually, as they both require a complete
frequency sweep.
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