Nortel Circuit Card Installation Manual page 891

Table 278
NTAK03, NTDK20, and NTDK97 µ-Law tones and cadence (Part 5 of 6)
Frequency
Tone #
80
81
82
83 reserved
84 350/440
85 400/450
86
87 1400
88
89 1400
90 1800
91
92
93 1300
94 1500
95 1880
96 350/440
97
98
99
100
dB below
(Hz) overload
480
420
440
-17/-17
-17/-17
400
950
470
940
-10/-10
TBD
TBD
TBD
TBD
The TDS/DTR card
Precision
Ringing
Tones
-19 ÷
-9 ÷
-29 ÷
÷
÷
-17 ÷
-26 ÷
-12 ÷
-12 ÷
-12 ÷
0 ÷
0 ÷
0 ÷
0 ÷
0 ÷
Circuit Card
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DTMF
Digits MF Digits
Description and Installation