Nortel DMS-100 Series General Description Manual page 56

1-40 DMS-100 ringing overview
Figure 1-28 Ringer configurations
Bridged ringing
In the bridged ringing configuration, the subscriber ringer is connected across
tip and ring. The ringing signal is applied across tip and ring. The ring lead acts
as the signal source and the tip lead acts as the signal return.
Tip ringing
In the tip ringing configuration, the subscriber ringer is connected across the
tip lead and earth ground. The earth ground is provided at the subscriber
location. In this configuration, the ringing signal is applied to the tip lead only.
The tip lead acts as the signal source and earth ground acts as the signal return
path.
Ring ringing
In the ring ringing configuration, the subscriber ringer is connected across the
ring lead and earth ground. The earth ground is provided at the subscriber
location. In this configuration, the ringing signal is applied to the ring lead
only. The ring lead acts as the signal source and the earth ground acts as the
signal return path.
297-1001-131 Standard 06.01 October 2000
B B r r i i d d g g e e d d r r i i n n g g i i n n g g
Ringing voltage appears across tip
and ring leads
T T i i p p r r i i n n g g i i n n g g
Ringing voltage appears across tip
lead and earth ground
R R i i n n g g r r i i n n g g i i n n g g
Ringing voltage appears across
ring lead and earth ground