The TDS/DTR card Page 887 of 906
Circuit Card Description and Installation
Tones and cadences

The following tables give the tones and cadences provided by the NTAK03

TDS/DTR card.

Table 278
NTAK03, NTDK20, and NTDK97 µ-Law tones and cadence (Part1 of 6)
Tone #
Frequency
(Hz)
dB below
overload
Precision
Ringing
Tones
DTMF
Digits MF Digits
1350/440 -23/-23 ÷
2(533 + 666) x 10 -23/-23 ÷
3440 -23 ÷
4350/440 -19/-19 ÷
5440/480 -25/-25 ÷
6480 -23 ÷
7480/620 -30/-30 ÷
81020 -16 ÷
9600 -23 ÷
10 600 -16 ÷
11 440/480 -22/-22 ÷
12 350/480 -23/-23 ÷
13 440/620 -24/-24 ÷
14 940/1630 -12/-10 P
15 700/1210 -12/-10 1
16 700/1340 -12/-10 2
17 700/1480 -12/-10 3
18 770/1210 -12/-10 4