Fuji Xerox DocuPrint M355df Service Manual page 528

Pulse Dialing & Tone Dialing
Pulse dialing
"3, 5, ...... "
Switch
Tone dialing
"3, 5, 2, ...... "
Switch
DTMF matrix
3 The switch connects lines according to the transmitted number.
4 When a connection between local switches is established, the local switch of the called party
sends a ringing signal to the telephone of the called party. The telephone that receives the ring-
ing signal emits its ring tone. At the same time, the called party's local switch sends a ring back
tone (RBT) to the calling party's telephone to indicate that a connection to the called party has
been established.
10.2 Telephone Call Connection Mechanism
3
3
1209Hz 1336Hz 1447Hz
High frequency
10-7
Chapter 10 Principle of Operation
5 .........
2 .........
5
697Hz
770Hz
Low
frequency
852Hz
941Hz
KjA10005XA