Provisioning Page97 of 544
Option11C and 11C Mini TechnicalReference Guide
Example:
•275 stations at cutover
•304 stations at two years
•352 stations at five years
Cutover: 275 x 5.5 (CCS/T) x 2 = 3025 CCS total system load
Two-year: 304 x 5.5 (CCS/T) x 2 = 3344 CCS total system load
Five-year: 352 x 5.5 (CCS/T) x 2 = 3872 CCS total system load
Calculating number of trunks required
Enter the values obtained through any of the three previous methods in
Worksheet A. Add the calculations to the worksheet. Once the trunk CCS/T
is known and a grade of service has been specified by the customer, the
number of trunks required per trunk group to meet cutover, two-year, and
five-year requirements is determined as shown in the following example.
Example
The customer requires a Poisson 1 percent blocking grade of service (see
Reference Table 1). The estimated trunk CCS/T is 1.14 for a DID trunk
group. With the cutover, two-year, and five-year number of lines, the total
trunk CCS is determined by multiplying the number of lines by the trunk
CCS/T:
Cutover: 275 (lines) x 1.14 (trunk CCS/T) = 313.5 CCS
Two-year: 304 (lines) x 1.14 (trunk CCS/T) = 346.56 CCS
Five-year: 352 (lines) x 1.14 (trunk CCS/T) = 401.28 CCS
Table 2 1
Default method and manual calculations analysis
Default method Manual calculations Difference
Cutover 3025 2863 CCS 162 CCS
Two years 3344 3162 CCS 182 CCS
Five years 3872 3657 CCS 215 CCS