25
TONE SIGNALING FORMATS
Tone Encoding Tables
Entering a user ID number, often called a CAP code, is straightforward for most of the encoding formats
supported by the TRC. For example, when encoding DTMF or 5-tone, the digits 0-9 are simply typed in directly.
Some formats do not allow for this straightforward approach. These are Plectron, Quick Call I, and Avcall. This
section explains how to enter a code in these formats.
Plectron Encoding:
To encode Plectron, four digits must be used. The first two digits represent the 1
st
tone, and
the 2
nd
two digits represent the 2
nd
tone. Simply locate the code associated with each tone from the table. For
example, the tone sequence 454.6 + 2688 would be entered as 1253.
Plectron Tones
01
282.2
08
382.2
15
517.7
22
701
29
950
36
1287
43
1743
50
2361
57
3197
02
294.7
09
399.2
16
540.7
23
732
30
992
37
1344
44
1820
51
2465
58
3339
03
307.8
10
416.9
17
564.6
24
765
31
1036
38
1403
45
1901
52
2574
59
3487
04
321.4
11
435.3
18
589.7
25
799
32
1082
39
1465
46
1985
53
2688
05
335.6
12
454.6
19
615.8
26
834
33
1130
40
1530
47
2073
54
2808
06
350.5
13
474.8
20
643
27
871
34
1180
41
1598
48
2165
55
2932
07
366.0
14
495.8
21
672
28
910
35
1232
42
1669
49
2260
56
3062
Avcall & Motorola Quick Call 1 Encoding:
Avcall and Quick Call 1 are dual-tone formats, which means a pair of
tones are sent simultaneously. Two tone-pairs are sent, meaning that four tones in total must be selected. Like
Plectron, above, two digits are entered for each tone. Locate the desired tone in the table to find its corresponding
code. A total of 8 digits must be entered. For example, the tone sequence 645.7 & 312.6 + 881.0 & 1479.1 would
be entered as 07001015.
Avcall & Motorola Quick Call 1 Tones
00
312.6
07
645.7
14
1333.5
21
668.3
28
412.1
35
851.1
42
473.2
49
346.7
01
346.7
08
716.1
15
1479.1
22
741.3
29
457.1
36
944.1
43
524.8
50
977.2
02
384.6
09
794.3
16
398.1
23
822.2
30
507.0
37
371.5
44
582.1
51
1084.0
03
426.6
10
881.0
17
441.6
24
912.0
31
562.3
38
1047.1
45
645.7
04
473.2
11
977.2
18
489.8
25
358.9
32
623.7
39
1161.4
46
716.7
05
524.8
12
1083.9
19
543.3
26
1011.6
33
691.8
40
384.6
47
794.3
06
582.1
13
1202.3
20
602.6
27
1122.1
34
767.4
41
426.6
48
881.0
Signaling Format Compatibility
In tone remote systems, the industry standard 2175 guard tone is filtered out by the tone remote adapter at the
base station so that it is not heard over the air. This filter can affect signaling tones close to 2175 Hz. Tones within
+/-70 Hz could be attenuated to a level such that they cannot be decoded by receiving equipment. There are
several ways to deal with this issue:
1. Choose a format that will not be affected.
2. Do not use the affected tone(s).
3. Change the guard tone.
