Meridian America 61 User Manual

3-14 

 guidelines

Once station and trunk requirements have been determined for the complete

system, the 

 Receiver 

 requirements can be calculated. DTR

are shared by all customers in the system and should be distributed equally

over all the network loops.

Tables 6-3 through 6-6 (at the end of this document) are based on models of
PBX traffic environments and can be applied to determine DTR needs in

most cases. When the system being provisioned does not fall within the

bounds of these models or is equipped with any special features, the detailed
calculations must be performed for each feature and 

 number of 

receivers must 

 the highest result.

Some special features are:

Centralized Attendant Service (CAS)

Direct Inward System Access (DISA)

 Authorization Code

Charge Account for Call Detail Recording (CDR)

Integrated Message Service (IMS)

Refer to the section “Feature calculations” for more information

on the above features.

System engineering 553-3001-151