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TELEPHONE SYSTEM DEFINITIONS

dBm
600 Ohm

Volts Peak-to -Peak
10
 6.93
9
 6.18
8
 5.5
7
 4.91
6
 4.37
5
 3.9
4
 3.47
3
 3.1
2
 2.76
1
 2.46
0
 2.19
-1
 1.95
-2
 1.74
-3
 1.55
-4
 1.38
-5
 1.23
-6
 1.1
-7
 0.98
-8
 0.87
-9
 0.78
-10
 0.69
-11
 0.62
-12
 0.55
-13
 0.49
-14
 0.44
-15
 0.39
-16
 0.35
-20
 0.22
-25
 0.12
-30
 0.07
-35
 0.04
-40
 0.02
-50
 0.01
 
 


0 dBm = 90 dBrn

dBm = dBrn - 90

dBrn = dBm + 90

Reference Noise = 1 picowatt = - 90 dBm.

Decibels above reference noise= dBrn

Decibels above reference noise in a C-message weighting filter = dBrnc (tone 1000Hz at 0 dBm or 90 dBrn).

Picowatts of noise psophometrically weighted (pWp) dBmp (tone 800 Hz at -90 dBm) dBmp = dBrnc - 90
 
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