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Provisioning Page 93 of 544
Option 11C and 11C Mini Technical Reference 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 averages are then applied to calculate trunk requirements
for the system being provisioned (see the example in Table 17).
Table 17
Example of station, trunk, and intra CCS/T averaging
Customer A Customer B Customer C Total 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