ZETRON Model 25 - DTMF Tone Pair Frequencies and Timings; Quick Call One (2+2) Frequencies and Timings

Index
025-9567E 125
DTMF Tone Pair Frequencies and Timings
Column
1
Column
2
Column
3
Column
4
Row 1
--1--
701.3
1215.9
--2--
701.3
1331.7
--3--
701.3
1471.9
--A--
701.3
1645.0
Row 2 --4--
771.4
1215.9
--5--
771.4
1331.7
--6--
771.4
1471.9
--B--
771.4
1645.0
Row 3 --7--
857.2
1215.9
--8--
857.2
1331.7
--9--
857.2
1471.9
--C--
857.2
1645.0
Row 4 --*--
935.1
1215.9
--0--
935.1
1331.7
--#--
935.1
1471.9
--D--
935.1
1645.0
Timing: Variable. Typical value is 150 milliseconds of tone, 50 milliseconds of
silence.
Digits: 0 through 9, as well as A, B, C, D, *, and #.
Quick Call One (2+2) Frequencies and Timings
A Series B Series Z Series
Tone # Freq. Code Freq. Code Freq. Code
0 358.9 CA 371.5 CB 346.7 CZ
1 398.1 DA 412.1 DB 384.6 DZ
2 441.6 EA 457.1 EB 426.6 EZ
3 489.8 FA 507.0 FB 473.2 FZ
4 543.3 GA 562.3 GB 524.8 GZ
5 602.6 HA 623.7 HB 582.1 HZ
6 668.3 JA 691.8 JB 645.7 JZ
7 741.3 KA 767.4 KB 716.1 KZ
8 822.2 LA 851.1 LB 794.3 LZ
9 912.0 MA 944.1 MB 881.0 MZ
A 1011.6 NA 1047.1 NB 977.2 NZ
B 1122.1 PA 1161.4 PB 1084.0 PZ
Timing: Variable.
Typical timing: 1250 ms 1st tone pair
0 ms gap
1000 ms 2nd tone pair
5000 ms group call (if 1st and 2nd tone pairs are same)