Table 25: Examples of hotel numbering at different numbering levels
7.6.3 Preshift from master
Preshift from master was introduced in program 8r2. This shift adds the possibility of moving the logical number
before the standard number calculation procedure. This parameter is particularly useful in complex systems
KDC1905M with common satellites (many blocks with common input, e.g. gateway).
In each block of flats in the housing estate, the numbering of flats may be repeated (e.g. one block includes flats
1-20 and the other 1-50). In such a situation, overlapping numbers will not be correctly handled in case of a satellite
on the gate (the installer must remember to ensure that the supported numbers in PBXes are unrepeatable). For this
purpose the parameter was created – setting the preshift, for common satellites, in blocks: 100 in the first and 200 in
the second, you can easily differentiate the numbers from the gate point of view. In this case the number 202 will
call premises 2 in block 2 and the number 116 will call premises 16 in block 1.
The easiest way to use this parameter is to use it as a prefix (setting the numbers of type 100, 200, 1000, 3000,
etc.). Due to the fact that preshift is added to the selected number before the rest of conversion, it is enough to
configure the numbering separately for each block (e.g. ranges of logical, physical and special redirections in A2
program or residents list) and then set the preshift to master in the local parameter of a common keypad.
For illustration – if a special number 200 has been set in block 1 (prefix 1000), which is outside the range of
physical numbers, then after using the prefix from the master this number can be dialed from the common keyboard
as 1200. If the preshift would not be used, another redirection in A2 program – from 1200 to the required physical
number should be entered).
In other words: the master preshift is deducted from the number and the result obtained is treated by PBX as a
number entered from its local keyboard.
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