Idle Channel Noise - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 168 of 544
Table 44
Transhybrid loss
Input Frequency (Hz)
300
500
2500
3400

Idle Channel Noise

Table 45
Idle Channel Noise
Connection
Line — Line
Line — Trunk
Trunk — Trunk
553-3011-100 Standard 14.00
Transmission parameters
Idle channel noise is noise in the absence of a signal. It is the short-term
average absolute noise power, measured with either C-message weighting for
µ−Law or Psophometric weighting for a A-Law. The 3 k Hz flat measurement
uses equal weighting for all frequencies in the 20-3000 Hz range. The values
are shown in Table 45.
µ-Law C Message
Noise dBrnC0
<20
<20
<20
January 2002
Transhybrid Return Loss (dB)
16
20
20
16
A-Law Psophometric
dBmP0
>65
>65
>65
3 kHz
dBm0
<29
<29
<29