Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 780

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features
Touch-Tone or Rotary Signaling
Table 45.
No. of Devices
8 or more
Table 46.
No. of Devices
10 or more
Follow these steps to calculate the number of TTRs required by the system:
1. Total the TTRs needed for the volume of calls per hour (see
TTRs Required for Primary Delay Announcement Devices When
Using Prompt-Based Overflow
1
2
3
4
5
6
7
TTRs Required for Secondary Delay Announcement Devices When
Using Prompt-Based Overflow
1
2
3
4
5
6
7
8
9
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
No. of TTRs Required
1
2
3
4
4
5
5
6
No. of TTRs Required
1
1
1
2
2
2
3
3
3
4
Issue 1
April 1999
720
Table 43).