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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Control Unit Configuration
Page 2-18Numbering the System
2
Table 2–4 estimates the total number of TTRs required in the system, based on
call volume and whether the system uses account codes. The call volume per
hour in this table includes all calls originating from single-line telephones, calls on
tie lines, incoming remote access and Direct Inward Dial (DID) calls.
NOTE:NOTE:NOTE:
You must consider the call traffic across a private network when estimating
the number of required TTRs. This includes calls on analog tandem tie
trunks and T1-emulated tandem tie trunks. In addition, if your private
network includes Centralized Voice Messaging, you must consider the call
traffic coming across the private network for the voice messaging system
and the TTRs required for the updating of Message Waiting lights
(Release 6.1 or later systems). For this updating, a TTR is required at the
sending end and the receiving end. If the systems in the private network
are connected by PRI trunks, no additional TTRs are needed.
Table 2–4. System Requirements for Touch-Tone Receivers
In Release 6.0 and later systems, the use of the Prompt-Based Overflow setting,
which allows callers to request overflow coverage while waiting in a calling group
queue, requires TTRs for primary and secondary delay announcement devices
that present the option to callers.
Table 2–5
shows the TTRs required for primary delay announcement devices
when using the Prompt-Based Overflow setting.
TTRs Required
Calls/Hour No Account Codes Account Codes Used
110 2 4
180 4 6
350 4 8
420 6 8
610 6 10
710 8 10