DSP-4000 Series
Users Manual
2-28
• Attenuation: Measures the attenuation of each cable pair.
• DC Resistance: Measures the loop resistance of each cable pair.
• ACR: Calculates the ratio of attenuation to crosstalk for all combinations of
cable pairs.
• RL (Return Loss): Measures signal loss due to signal reflections in the
cabling.
• PSNEXT (Power Sum NEXT): For each cable pair, PSNEXT is calculated as
the sum of the NEXT from all other pairs.
• PSELFEXT (Power Sum ELFEXT): For each cable pair, PSELFEXT is
calculated using the sum of the FEXT from the other pairs.
• PSACR (Power Sum ACR): For each cable pair, PSACR is calculated using
the sum of the NEXT from the other pairs.
The following tests apply to coaxial cabling:
• Impedance: Measures the impedance of the cable.
• Resistance: Measures the loop resistance of the cabling, shield, and
terminator.
• Length: Measures the length of unterminated cables.
• Anomaly Detection: During a coaxial cable test, the test tool also detects and
reports the position of the largest impedance anomaly (if any are present) on
the cable.
Single Test
The SINGLE TEST mode provides access to the individual tests defined by the
selected test standard, except for the ACR test. This mode also lets you run the
HDTDR and HDTDX analyzer tests. A scanning function, which continuously
repeats the test, is available for the wire map, resistance, HDTDR, and HDTDX
analyzer tests. Single tests are useful for isolating cabling faults and quickly
checking repairs.
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