GAI-Tronics ICP9000 Navigator Series Console Installation and Service Manual - Manual (Page 72)

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4. The first digit of this number (6 in this example) corresponds to a number under the Group # heading
on Table 21, and indicates which row of frequencies on Table 21 will be used for the A tone. In this
example, the A tone number entered by the console operator is 4, which corresponds to 1251.4 Hz.
5. The second digit of the number from chart B (2 in this example) also corresponds to a number under
Table 21 Group #, and indicates which row of frequencies on Table 21 will be used for the B tone. In
this example, the B tone number entered by the console operator is 3, which corresponds to 669.9 Hz.
The previous example involves the console operator being required to enter two digits from the keypad
(programming the number of 2-Tone digits accepted from the user on the selected channel to 2).
However, if all three digits were required from the console operator (programming the number of 2-Tone
digits accepted from the user on the selected channel to 3), the procedure for finding the frequencies from
Table 21 would be the same except that the most significant digit of the prefix would be the first digit
entered from the keypad.
If no digits were required from the operator (programming the number of 2-Tone digits accepted from the
user on the selected channel to 0) both the A and B tone frequencies would be predetermined through
programming and the same tone sequence would be sent every time a 2-Tone page is generated on this
particular channel.
Group Call
A group call occurs when both tones of a 2-Tone paging sequence are the same frequency. If the console
is programmed to allow 8 second group calls on a particular channel, then whenever a paging sequence is
generated that consists of two tones of the same frequency, the page consists of an 8 second burst of that
tone frequency.
However, 8 second group calls do not apply when the GE code plan has been selected. In the GE system,
a “diagonal” tone of 742.5 Hz is inserted in place of the first tone if that tone is the same as the second
tone.
Example 2
Suppose the number of 2-Tone keypad digits accepted from the user on the selected channel is 2 and the
GE code plan has been selected. The preset 2-Tone digit is 4.
Therefore, if the operator entered 55 as the paging digits and pressed the TRANSMIT button, the console
would send the 2-Tone sequence A = 742.5 Hz, B = 907.5 Hz. This would alert a pager with a GE
capcode of 455.