Was ist "metallic power spectrum density" ?

Vielleicht schreibst du ja mal dazu, in welchem Standard das steht,
damit man sich den Kontext mal ansehen kann.

Hallo TOM

Such mal nach:
IEEE "metallic noise" "power spectrum"

Scheint Laborjargon der Telefonleute zu sein

http://cp.literature.agilent.com/litweb/pdf/N1626-90000.pdf
User’s Manual xDSL TIMS Test Module (ITU-T)

"Loop Noise
Noise between the tip and ring conductors is known as loop noise, 
metallic noise,tip-to-ring noise, or differential noise."

"Noise Balance Test
This test measures the metallic noise level, power influence, and noise 
balance in a twisted-pair line.
The test’s metallic (or tip-to-ring) noise measurement measures the 
total amount of noise on the line. This noise includes power line noise, 
background noise, and tones weighted by the selected filter."