Total Distortion Including Quantization Distortion - Nortel Meridian 1 Option 11C Compact Technical Reference Manual

Total distortion including quantization distortion

Chapter 2 — Transmission parameters
The quantization distortion is the difference between the original analog
signal and the analog signal (signal plus noise) resulting from the decoding
process. There are two methods of measuring the quantization distortion:
Method 1
With a noise signal corresponding to CCITT recommendation 0.131 applied
to the input interface, the total distortion measured at the output interface lies
above the limit given in Table 14.
Table 14
Total distortion method 1
Input Signal
dBmO
-55
-40
-34
-27 to -6
-3
Method 2
With a sine wave at the reference frequency is applied to the input interface,
the total distortion measured at the output port interface lies above the limit
given in Table 15.
Reference frequency:
• 1020 Hz
Meridian 1 Option 11C Compact
Analog — Analog
dB
11.1
26.1
30.7
32.4
24.0
Page 25 of 136
Digital — Analog
dB
13.1
28.1
32.7
34.4
26.8
Technical Reference Guide