Quick Call II Cap Code Translation

General Encoding Method (3 Digit Cap Code)

The first digit of the 3 digit Cap Code (for a particular call) determines the tone groups from which tones A and B will be selected (or tone C as well in the case of certain group calls), as indicated in Table 1. The next two digits of the Cap Code identify tones A and B respectively, as selected from the tone groups indicated in Table 1.

To determine the tone frequencies or tone codes for a specific Quick Call II ID given in a Cap Code format, proceed as follows:

1. Locate the first digit of the Cap Code in the first column of Table 1.
2. In columns 2 and 3 of Table 1, find the tone group numbers for tones A and B that correspond to the first digit of the Cap Code.
3. Locate the second digit of the Cap Code in the first column of Table 2. This table contains the 80 "standard" tone frequencies divided into eight groups of ten tones each. These groups are numbered and designated as tone groups 1-6 and 10-11. The second digit of the Cap Code corresponds to the tone number for tone A.
4. Locate the tone group number for tone A in Table 2 (determined in step 2). The tone code and frequency are indicated for tone A under the tone group.
5. Locate the third digit of the Cap Code in the first column of Table 2. This is the tone code for tone B.
6. Locate the tone group number for tone B in Table 2 (determined in step 2). The tone code and frequency are indicated for tone B under the tone group.

Example: Suppose we need to decode Cap code "635" for programming tone frequencies into the Quick Call II equipped Maxtrac. In order to do so, first we look at Table 1. According to Table 1, the first digit of this Cap Code, "6", indicates that tone A is selected from tone group 2, and tone B is selected from tone group 1. The second digit of the Cap Code (3) indicates that tone number 3 of group 2 is used for tone A, and the third digit of the Cap Code shows tone number 5 of group 1 is used for tone B. This Maxtrac would have the following tones programmed:

Cap Code 635

• Tone A = Tone Code 123, Frequency 669.9 Hz
• Tone B = Tone Code 115, Frequency 433.7 Hz

High Capacity Encoding Method (1 Letter Prefix, 3 Digit Cap Code)

This encoding method was originally devised to accomodate the large number of pagers and other communication products used in high capacity paging systems. Decode Cap Codes encoded by this method are assigned a letter prefix, commonly referred to as the "code type". In the general encoding method, the relationship between the first digit of the Cap Code and the tone qroups selected is arbitrary. In the code assignment method, the selected tone groups depend on the system code type. Table 3 shows the group selection scheme by code type. In essence, each code type column in this table is used in the same way as Table 1 was used in the general encoding method. In the column for the Cap Code letter prefix, on the row corresponding to the first digit of the Cap Code, will be located the tone groups from which tones A and B will be selected. Table 3 and the second and third digits of the Cap Code determine the exact tone codes from Table 2 as outlined in steps 3-6 of the General Encoding Method. If the Cap Code letter prefix is a "Y", however, locate the row corresponding to the first digit of the Cap Code in column Y of Table 3, and use the resulting tone group information (tones A, B in tone groups A, B or Z), Table 4, and the second and third digits in the Cap Code to determine the exact tone codes.

Example: Suppose we need to decode Cap Code "D476" for programming tone frequencies into the Quick Call II equipped Maxtrac.

1. Looking at the prefix and first digit of the Cap Code, "D4", we find that column D and row 4 of Table 3 contains the information "1 5". Therefore, tone A is in tone group 1 and tone B is in tone group 5.
2. Using the second digit of the Cap Code, "7", and Table 2, we determine that tone A is tone number 7 in tone group 1 (determined in step 1).
3. Using the third digit of the Cap Code, "6", and Table 2, we determine that tone B is tone number 6 in group 5 (determined in step 1).

This Maxtrac would have the following ID tones programmed:

• Tone A = Tone Code 117, Frequency 483.5 Hz
• Tone B = Tone Code 156, Frequency 767.4 Hz

Example: Suppose we need to decode Cap Code "Y392" for programming tone frequencies into the Quick Call II equipped Maxtrac.

1. Looking at the prefix and first digit of the Cap Code, "Y3", we find that column Y and row 3 of Table 3 contains the information "Z Z". Therefore, tone A is in tone series Z and tone B is in tone series Z.
2. Using the second digit of the Cap Code, "9", and Table 4 (remember that we have a "Y" prefix situation), we determine that tone A is tone number 9 in tone series Z (determined in step 1).
3. Using the third digit of the Cap Code, "2", and Table 4, we determine that tone B is tone number 2 in tone series Z (determined in step 1).

This Maxtrac would have the following ID tones programmed:

Cap Code Y392:

• Tone A = Reed Code MZ, Frequency 881.0 Hz
• Tone B = Reed Code EZ, Frequency 426.6 Hz

Group Call Encoding Method

Long Tone B or C Type Call Format

The group Cap Code is assigned the same way as the individual code. Hoewver, only those receivers with the same tone B or C frequencies are grouped. A group call code (for a long tone group call) consists of three digits, but the second and third digits are the same. The first digit indicates the tone group and the second and third digits indicate the sprecific tone number within that group for either tone B or tone C, depending whether you choose Long Tone B or Long Tone C as your group call.

A typical Maxtrac equipped with QC II Long Tone C group call may have the following Cap Codes assigned to it:

Cap Code B456/366 (366 indicates the group call Cap Code)

Cap Code B456, using the High Capacity Encoding Method:

• Tone A = Tone Code 116, Frequency 457.9 Hz
• Tone B = Tone Code 125, Frequency 746.8 Hz

Group Cap Code 366, using the General Encoding Method:

• Tone C = Tone Code 130, Frequency 979.9 Hz

Call Format = A-B/Long C

Dual Call Formats

In this approach, two different dual tone sequential calls are possible through the programming of three tones (A, B, and C) in each radio. One of the three tones, either tone A or tone B, is used in both two tone sequential addresses. Radios and other communications devices are assigned two, three, or four digit Cap Code numbers, which may be interchangeably used for either individual or group calls. Therefore, in order to prevent confusion, the coding arrangements must be established at the time of system design. Examples of dual code group calls supported by the Maxtrac QC II Decoder include the A-B/A-C and A-B/B-C call formats.

Metro-Page/Centracom System Method

When the pager is used with some "Metro-Page" systems, or dispatched from a Centracom system, the pager code is a 4-digit number. The groups for tones A and B are determined by the first two digits of the Cap Code as indicated in Table 5. The frequencies for tones A and B are then selected from Table 2 for prefixes up to and including "49", and from Table 4 for prefixes above this, in accordance with the third and fourth digits of the Cap Code.

Example: To determine the tone frequencies for Cap Code 1645:

1. Looking up the first two digits of the Cap Code, "16", in Table 5, we find the information "2 1". Therefore, tone A is from tone group 2, and tone B is from tone group 1, in Table 2.
2. Using the third digit of the Cap Code, "4", and Table 2, we determine that tone A is tone number 4 in tone group 2 (determined in step 1).
3. Using the fourth digit of the Cap Code, "5", and Table 2, we determine that tone B is tone number 5 in tone series 1 (determined in step 1).

Cap Code 1645, using the Metro-Page/Centracom Encoding Method:

• Tone A = Tone Code 124, Frequency 707.3 Hz
• Tone B = Tone Code 115, Frequency 433.7 Hz

Example: To determine the tone frequencies for Cap Code 9920:

1. Looking up the first two digits of the Cap Code, "99", in Table 5, we find the information "Z Z". Therefore, tone A is from tone series Z, and tone B is from tone series Z, in Table 4.
2. Using the third digit of the Cap Code, "2", and Table 4, we determine that tone A is tone number 2 in tone series Z (determined in step 1).
3. Using the fourth digit of the Cap Code, "0", and Table 4, we determine that tone B is tone number 0 in tone series Z (determined in step 1).

Cap Code 9920, using the Metro-Page/Centracom Encoding Method:

• Tone A = Reed Code EZ, Frequency 426.6 Hz
• Tone B = Reed Code CZ, Frequency 346.7 Hz