
4
5-Tone:
In 5-Tone signaling the 0-9, B, C, D and F tones can be used as digits within a unit ID, such as 12345 or 9CB31.
Please note that some manufacturers may reserve the B, C, D and F tones for special functions. However, the A
and E tones work differently.
The A tone is used as a group tone, which means that if 1234A is encoded then any unit ranging 12340 to 12349
will decode or if 123AA is encoded then any unit ranging from 12300 to 12399 will decode.
The E tone is a repeat tone. For example when sending 12344 in CCIR the second 4 in the sequence will be an E
tone (2110 Hz) rather than a second 4 tone (1358 Hz). A sequence of 12444 would send a 4 tone, followed by an
E tone, followed by a 4 tone. This is done for reliability purposes. Please note that some manufacturers of radios
and service monitors do not follow the standard using the repeat tone. If problems are experienced decoding
sequences with repeat digits verify the frequencies the radio or service monitor are encoding.
Another important note regarding 5-Tone signaling is about the tone timings. Under no circumstances should a
tone time of less than 30 msec ever be used, as this greatly reduces the reliability of decoding the tones. Midian
recommends using 33 msec or higher.
Please see the following table for the frequencies and timings of the various 5-Tone protocols. The frequencies
are shown in Hz and the times in milliseconds.
Tone # Code
Digit CCIR
1 & 2 DZVEI DDZVEI EE
EI
MODAT NATEL PCCIR PDZVEI PZVEI ZVEI1
Tone 0 0 1981 2200 2400 1981 600 637.5 1633 1981 2200 2400 2400
Tone 1 1 1124 970 1060 1124 741 787.5 631 1124 970 1060 1060
Tone 2 2 1197 1060 1160 1197 882 937.5 697 1197 1060 1160 1160
Tone 3 3 1275 1160 1270 1275 1023 1087.5 770 1275 1160 1270 1270
Tone 4 4 1358 1270 1400 1358 1164 1237.5 852 1358 1270 1400 1400
Tone 5 5 1446 1400 1530 1446 1305 1387.5 941 1446 1400 1530 1530
Tone 6 6 1540 1530 1670 1540 1446 1537.5 1040 1540 1530 1670 1670
Tone 7 7 1640 1670 1830 1640 1587 1687.5 1209 1640 1670 1830 1830
Tone 8 8 1747 1830 2000 1747 1728 1837.5 1336 1747 1830 2000 2000
Tone 9 9 1860 2000 2200 1860 1869 1987.5 1477 1860 2000 2200 2200
Group A 2400 825 885 1055 2151 --- 1995 1050 825 970 2800
B 930 740 810 930 2433 --- 571 930 886 810 810
C 2247 2600 740 2400 2010 --- 2205 2400 2600 2800 970
D 991 885 680 991 2292 --- 2437 991 856 885 885
Repeat E 2110 2400 970 2110 459 487.5 1805 2110 2400 2600 2600
F 1055 680 2600 2247 1091 --- 2694 --- --- 680 680
Timing
(msec) 100±15
70±15 70±15 70±15 40±4 33±0.5 40±5 70 100±10 70±15 70±15 70±15