Provisioning guidelines 3-3
Step 1:

Define and forecast growth

The first step in provisioning an initial SL-1 is to forecast the growth of the
system at the 2-year and 5-year interval in terms of telephone stations.
The number of telephones required when the system is placed in service
(cutover) is determined by the customer. If the customer is unable to
provide a 2-year and 5-year station growth forecast, then a customer
estimate of annual growth of personnel in percent is used to estimate the
number of stations required at the 2-year and 5-year interval.
Example
A customer has 500 employees and requires 275 telephones to meet the
system cutover. The customer projects an annual increase of 5% of
employees based on future business expansion. The employee growth
forecast is:
-
500 employees x 0.05
(%
growth) = 25
-
525 employees x 0.05 = 27 additional employees at 1 year
-
552 employees x 0.05 = 28 additional employees at 2 years
-
580 employees x 0.05 = 29 additional employees at 3 years
-
609 employees x 0.05 = 31 additional employees at 4 years
-
640 employees x 0.05 = 32 additional employees at 5 years
The ratio of telephones to employees is 275/500 = 0.55.
System engineering 553-3001-l 51
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