Calculating Number Of Trunks Required - Meridian Nortel 1 Option 11C Technical Reference Manual

Table 21
Default method and manual calculations analysis
Cutover
Two years
Five years

Calculating number of trunks required

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
Default method
3025
3344
3872
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
Manual calculations
2863 CCS
3162 CCS
3657 CCS
Option 11C and 11C Mini
Provisioning Page 97 of 544
Difference
162 CCS
182 CCS
215 CCS
Technical Reference Guide