Meridian America 21, 51, 61, 71 manual Step 3:

3-12 Provisioning guidelines
Step 3:
Calculate number of trunks required
Trunks required
The values obtained through any of the three previous methods should now
be entered on Worksheet A (provided at the end of this document).
Add
your 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 the cutover, 2-year and 5-year
requirements of a customer can be determined as follows:
Example
The customer requires a Poisson 1% blocking grade of service (see Table
3-A at the end of this document). The estimated trunk CCS/r is 1.14 for a
DID trunk group. With the cutover, 2-year and 5-year number of lines, the
total trunk CCS is determined by multiplying the number of lines by the’.
trunk ccs/r:
Cutover 275 (lines) x 1.14 (trunk CCS/I) = 313.5 CCS
2year 304 (lines) x1.14 (trunk
CCS/r) =346.5 CCS
---
5 year 352 (lines) x1.14 (trunk CCS/I’) =401.28 CCS
Use Table 6- 1 to determine the quantity of trunks required to meet the trunk
CCS at cutover, 2-year and 5-year interval. In this case:
- 17 DID trunks are required at cutover
- 18 DID trunks are required at 2 years
-
21 DID trunk are required at 5 yearrs
Note: For trunk traffic greater than 4427 ccs, allow 29.5 ccs/mmk.
System engineering 553-3001-151
. .
.:.
I -.