Understanding the Impact FX Logical Numbering
Because there are no dedicated station or line ports in the Impact FX, the system uses an automatic configuration
method to logically number its stations and lines. Automatic configuration occurs after you perform a master clear
on the system.
How automatic configuration works
With automatic configuration, the system does a search for all installed station and line boards and assigns a
logical number for each provided station and line encountered during the search. The search begins at universal
slot 1 and proceeds through universal slot 6. When automatic configuration is finished, the system has logically
numbered all station and line ports in ascending order from universal slot 1 to universal slot 6.
How logical number and physical location relate to one another
The logical number of a station or line corresponds to its relationship to other stations or lines in the system but is
not dependent upon the board’s placement in the cabinet. The physical location of a station or line corresponds to
the order of the system’s board slots. The cabinet contains universal slots 1–6; therefore, even if the first
encountered line board is located in slot five, the system still assigns logical number one to the first line provided
by that board. During installation, you can skip slots. For example, you can install eight-line, loop start, line
boards in only slots one and 6 if you wish. In this case, slot one yields logical line numbers 1–8 and slot six yields
logical line numbers 9–16.
Where you can place circuit boards
Each installed board requires timing circuits equal to its capacity. For example, a 12–station board requires 12
timing circuits, an eight–line loop start line board requires eight circuits, and a fully configured T1 trunk board
requires 24 timing circuits. In the Impact FX, each universal slot provides 32 timing circuits. Because of this
timing circuit provision of each slot, you can place any station or line board at any slot location with no
restrictions.
Adding boards without renumbering
If you install or relocate a station or line board, this board does not operate until you take appropriate
programming action. If you use an available open slot for adding or relocating a board, that board’s stations or
lines assume logical numbers in sequence after the system’s last assigned logical station or line number. For
example, if the system’s last logical station number is 24, the logical numbers of the newly installed board’s
stations begin at logical number 25.
After you remove a board and delete it through programming, that board’s logical numbers are available for
reassignment. This means that you can remove a board, add or move another board, take the appropriate
programming action, and have the stations or lines of the added or relocated board assume the logical numbers
made available by the removed board. For example, if the system’s last logical number is 60 and you remove the
board providing stations with logical numbers 1–12 and delete it through programming, the stations on an added
board assume logical numbers beginning with 1 instead of 60. However, if you remove and program delete an
eight-station board and add a 12-station board, the first eight stations on the added board assume logical numbers
1–8 and the last eight stations assume logical numbers 60–72.
Remember, should you master clear the system, the automatic configuration feature logically numbers all station
and line ports in ascending order from the universal slot 1 to universal slot 6 throughout the entire system. This
action renumbers those station and lines provided by boards that you have added or relocated since you last
performed the system master clear.
Installing The IST Board – 11
Installing The IST Station Board
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