Provisioning Page93 of 544
Option11C and 11C Mini TechnicalReference Guide
Estimating CCS per terminal
Estimate the station and trunk CCS per terminal (CCS/T) for the installation
of a system using any one of the following methods:
•comparative method
•manual calculation
•default method

Comparative method

Select three existing systems which have a record of traffic study data. The
criteria for choosing comparative systems are:
•similar line size (+ 25 percent)
•similar business (such as bank, hospital, insurance, manufacturing)
•similar locality (urban or rural)
Once similar systems have been selected, their station, trunk, and intra CCS/
T are averaged. The averag es are then applied to calculate trunk r equirements
for the system being provisioned (see the example in Table17).
Table 1 7
Example of station, trunk, and intra CCS/T averaging
Customer A Customer B Customer C Tota l Average
Line size 200 250 150 600 200
Line CCS/T 4.35 4.75 3.50 12.60 4.20
Trunk CCS/T 2.60 3.0 2.0 7.60 2.50
Intra CCS/T 1.70 1.75 1.50 4.95 1.65