Nortel DMS-100 Series General Description Manual page 40

1-24 DMS-100 ringing overview
In the teen ringing configuration, a primary directory number (PDN) and up to
three secondary directory numbers (SDN) are assigned to a subscriber's line.
When the PDN is called, standard 1FR ringing is applied to the line (2-s ring,
4-s silence). When a SDN is called, one of the following three special ringing
patterns is applied:
•
•
•
Teen ringing is supported in superimposed ringing, coded ringing, and
frequency selective ringing using 30 Hz ringing schemes.
The following figures illustrate the relationship between the teen ringing signal
and the DMS-100 switch ringing cycle for superimposed, coded 20 Hz, and
coded 30 Hz ringing.
Figure 1-21 Teen ringing - superimposed ringing scheme
PDN (1FR)
SDN 1
SDN 2
297-1001-131 Standard 06.01 October 2000
2 long rings
2 short rings, 1 long ring
1 short ring, 1 long ring, 1 short ring
0 1
2 2 s s
0 0 . . 9 9 2 2 s s
0 0 . . 4 4 6 6 s s 0 0 . . 4 4 6 6 s s
0 0 . . 4 4 6 6 s s
SDN 3
0 1
6 s
2 3 4 5
0 0 . . 9 9 2 2 s s
0 0 . . 9 9 2 2 s s
0 0 . . 4 4 6 6 s s
0 0 . . 9 9 2 2 s s
2 3 4 5
6 7 8 9 10
6 7 8 9 10
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