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System Requirements
for Touch-Tone Receivers
Table 3-4 estimates the total number of TTRs required in the system, based on call
volume and whether the system uses account codes. The call volume in this table
includes all calls originating from single-line telephones, calls on tie lines, incoming
remote access and Direct Inward Dial (DID) calls, and calls routed to the voice
messaging system.
Table 3-4. System Requirement for TTRs
Calls/Hour
Account Codes Used
No Account Codes Used
110
2
180
4
350
4
420
6
610
6
710
8
The following modules supply TTRs for the
Table 3-5. Modules with TTRs
4
4
4
8
6
8
MERLIN LEGEND Communications
System.
Module
No. of TTRs
008 OPT
2
012
2
400 GS/LS
4
400
4
800 DID
2
800 LS-ID
2
3–10 Telephone Problems