ZETRON 748, Technical Manual

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Feature Set Reference
025-9368H 163
Two-tone Signaling
Two-tone call codes are a little more complicated since you must specify the timing, the code plan,
the cap code, and the tones to send. The format for entering a 2-tone call code is:
TCCABCX: T = Timing (1-8 Two-Tone Timing table)
CC = Codeplan (1-24 Two-Tone Codeplan table - Column)
A = Pager Cap-Code (0-9 Two-Tone Codeplan table - Row)
B = Tone 1 (first tone sent)
C = Tone 2 (second tone sent)
X = 0=Group, 1=Diagonal 1, 2=Diagonal 2
The timing is determined from the Two-Tone Timing table and specifies the timing for particular
type of signaling. The codeplan is from the Two-Tone Codeplans table, and determines the column
in which the tone set is located. The pager capcode is the actual entry (row) in the codeplan table to
determine the sets of tones to be used for Tone 1 and Tone 2. Tone 1 and Tone 2 are the actual tones
in the Two-tone Tone Groups table. See “Two-Tone Signaling” in Section 7 for the two-tone tables.
Below are three examples of how to determine the Selcall capcode entry for the Model 748.
Example 1 assumes you know the timing and two tones required to set off the pager. Example 2
assumes you know the code plan and capcode. Example 3 assumes you are translating an existing
Model 45 or Model 48 database where the page code was specified as T G1 G2 T1 T2. Timing,
Group 1, Group 2, Tone 1, Tone 2.
Example 1:
You have a pager that is setup for standard timing (1 second “A” tone, 0 gap, 3 second “B” tone, and
8 second group calls), and has an “A” tone of 953.7 Hz followed by “B” tone of 767.4 Hz.
We look up the timing in the Timing Table (see “Two-Tone Timing” in Section 7), and see that
timing 1 matches our pager. Finding the tone numbers is a little less direct. First we look up the
actual tones in the Tone Group table (see “Two-Tone Tone Groups” in Section 7). We find that
953.7 Hz is tone number 5 in Tone Group 3, and 767.4 Hz is tone number 6 in Tone Group 5. Now
we know that the “A” tone must come from Tone Group 3 and the “B” tone must come from Tone
Group 5.
Our pager uses Tone Group 3 followed by Tone Group 5. We need to find a Code Plan that has a
block in which Group 3 is followed by Group 5 (3+5). If we scan the Two-Tone Codeplan table (see
“Two-Tone Codeplans” in Section 7), we see a line labeled “Groups”. This shows which tone groups
are used by that codeplan in the column listed above. Any codeplan that uses group 3 followed by
group 5, should work for our pager. By scanning the table we find that codeplan 5 and 11 both have
3+5 listed in the 8xx row. For our purposes either codeplan would work for our pager. The tone
groups we need, under the codeplan 11, use capcode 8xx, this is the leading digit for our pager.