User's Manual

Provisioning guidelines 3-15
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From the appropriate table (See Table.6-3 to.Table 6-6 at the end of this
document) determine the number of DTR required and the DTR load for
cutover, two-year, and five-year interval. Record this information on
Worksheet B (located at the end of this document).
The following models are based on some common PBX traffic
measurements:
Model 1
Table 6-3 is based on the following factors:
- 33% intra-office calls, 33% incoming calls, and 33% outgoing calls
-
1.5% dial tone delay grade of service
-
no Digitone DID trunks or incoming Digitone tie trunks
Model 2
.
Table 64 is based on the following factors:
-
assumes same traffic pattern as model 1
-
the system has Digitone DID trunks or incoming Digitone tie trunks
-
Poisson 0.1% blockage grade of service
---
Model 3
Table 6-5 is based on the following factors:
-
15% intra-office calls, 28% incoming calls, and 56% outgoing calls
-
1.5% dial tone delay grade of service
-
no Digitone DID trunks or incoming Digitone tie trunks
Model 4
Table 6-6 is based on the following factors:
-
assumes same traffic pattern as model 3
-
the system has Digitone DID trunks or incoming Digitone tie trunks
-
Poisson 0.1% blockage grade of service
System engineering 553-3001-l 51