Overload Level - Nortel Meridian 1 Succession 1000 Manual

Table 40
Frequency response—A-Law
Frequency (Hz)
200
300
400
600
REF
2400
3000
3400
3600
Note: Positive values denote loss; negative values denote gain (measured at 2820 Hz with
0 dBm0 input level.

Overload level

Transmission characteristics—A-Law
Table 40 shows the minimum and maximum loss differences at significant
frequency breakpoints for 2-wire and 4-wire interfaces.
2-wire interface (dB)
Minimum
0.0
–0.5
–0.6
–0.6
–0.6
–0.6
–0.6
–0.6
0.0
Overload levels are measured with respect to the zero-level point in the PBX,
which is defined as having an overload point of +3 dBm in an
analog-to-digital conversion.
Therefore, the overload level in the receive direction is defined as the analog
signal level (at the port interface) with an average power that is 3 dB greater
than that of the signal, which after encoding produces the equivalent of the
digital milliwatt (PBX zero-level point). The overload level in the transmit
direction is defined as the analog signal level (at the port interface) with an
average power that is 3 dB greater than that of the signal, which after
Maximum
+5.0
+1.0
+2.0
+0.7
+0.7
+0.7
+1.0
+3.0
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4-wire interface (dB)
Minimum Maximum
0.0
–0.3
–0.5
–0.5
–0.5
–0.5
–0.5
–0.5
0.0
Transmission Parameters
+3.0
+0.3
+0.5
+0.5
+0.5
–0.5
+0.9
+1.0
—