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Option 11C and 11C Mini Technical Reference Guide
Detailed calculation: Method 1
This method can be used when there are no incoming Digitone DID trunks
and the following is assumed:
• Digitone receiver traffic is inflated by 30 percent to cover unsuccessful
dialing attempts.
• Call holding time used in intra-office and outgoing call calculations is
135 seconds if unknown.
• Digitone receiver holding times are 6.2 and 14.1 seconds for intra and
outgoing calls respectively.
• Factor (1 - R)/ 2 in (1) outgoing (incoming calls and outgoing calls are
equal). R is the intra-office ratio.
Follow the procedure below for detailed calculation Method 1.
1 Calculate Digitone calls:
Intra-office traffic = 100 x Digitone station traffic (CCS)
x R
call holding time in seconds 2
Outgoing traffic =
100 x Digitone station traffic x (1-R)
call holding time in seconds 2
Calculate total DTR traffic:
Total DTR traffic = 1.3 x [(6.2 x intra) + (14.1 x outgoing
)]
100
Calculate average holding time:
Average holding time = (6.2 x intra) + (14.1 x outgoing)
(intra calls + outgoing calls)
2 See Tables 22 and 23 and use the answers from steps 2 and 3 to determine
the number of DTRs required.