GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 139)

PL1877A Microprocessor Radio Telephone Interconnect Paging
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Plectron Paging
The Plectron paging feature requires a 4-digit prefix (capcode). Like 2-tone paging, the capcode and
code plan will determine at what frequency the paging tones will be transmitted.
Plectron paging uses the Plectron Code Plan Chart (Table 3) and Plectron Tone Group/Frequency Chart
(Table 4). Refer to the example below and the tables to determine the capcodes you need.
Plectron Paging Example
Suppose the number of Plectron keypad digits accepted from the user on the selected channel is 0 and the
capcode has been programmed to 3456. The A tone length is one second and the B tone length is two
seconds.
If the console operator were to press the T RANSMIT button, the console would send an A tone of 330.5 Hz
for one second, and then a B tone of 564.7 Hz for two seconds.
The frequencies for the A and B tones are determined from the charts, according to the following
procedure:
1. Locate the first two digits of the prefix (3 and 4 in this example) on Table 3.
2. In the column beneath this two-digit number, there are two P numbers (P5 and P6 in this example)
that correspond to tone groups on Table 3. Using the P number for the third digit of the prefix,
determine the correct tone group from the Table 4.
3. Find the frequency of A tone (330.5 Hz) by locating the intersection of the tone group row with the
column headed by the third prefix digit (5 in this example).
4. Find the frequency of the B tone is in the same manner by using the tone group for the fourth prefix
digit as listed in Table 3 below.
Table 3. Plectron Paging Code Plan Chart
Most Significant Digits-to-Tone Source
1
st
2 (MS)
Digits
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17
3
rd
digit tone
source
P1 P2 P1 P2 P3 P1 P3 P2 P3 P4 P1 P4 P2 P4 P3 P4 P5 P1
4
th
digit tone
source
P1 P2 P2 P1 P3 P3 P1 P3 P2 P4 P4 P1 P4 P2 P4 P3 P5 P5
1 st 2 (MS)
Digits
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
3
rd
digit tone
source
P5 P2 P5 P3 P5 P4 P5 P6 P1 P6 P2 P6 P3 P6 P4 P6 P5 P6
4
th
digit tone
source
P1 P5 P2 P5 P3 P5 P4 P6 P6 P1 P6 P2 P6 P3 P6 P4 P6 P5