Nortel DMS-100 Series General Description Manual page 32

1-16 DMS-100 ringing overview
Figure 1-14 Ringing on multiparty coded ringing line
Central
office
Central
office
Subscribers on multiparty lines can make calls to other subscribers on the same
line by placing a revertive call. In a revertive call, the originating subscriber
dials the called number. The DMS-100 then routes the originator to treatment,
which can be a busy tone or an announcement. The treatment given is defined
in table TMTCNTL. A description of the treatment table is found in the
Customer Data Schema Reference Manual. Upon receiving busy tone or
announcement, the originator goes on-hook within a specified time and the
called party is rung.
An announcement also can also be sent to the terminating party when the call
is answered, notifying them they are receiving a call from someone on their
party. This treatment also is defined in table TMTCNTL.
If the calling and called subscribers are on the same side of the line (tip or
ring), the calling party waits for the called party to answer (physical ringing
stops) and then goes off-hook to talk. If the calling and called parties are on
opposite sides of the line, the calling party receives a revertive splash ring
while the called party receives the coded ring of the called party. Revertive
ringing can be enabled or disabled by office parameter REVRING in table
297-1001-131 Standard 06.01 October 2000
I I n n c c o o m m i i n n g g c c a a l l l l t t o o p p a a r r t t y y 1 1
Tip
Ring
2 s
1 ringing cycle = 6 s
I I n n c c o o m m i i n n g g c c a a l l l l t t o o p p a a r r t t y y 7 7
Tip
Ring
1.5s
0.5s
1 ringing cycle = 6s
Party 1 Party 2 Party 3 Party 4
Party 5 Party 6 Party 7 Party 8
Party 1 Party 2 Party 3 Party 4
Party 5 Party 6 Party 7 Party 8