Chapter 10 Principle of Operation
10.2 Telephone Call Connection Mechanism
10-7
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.
KjA10005XA
697Hz
1209Hz 1336Hz 1447Hz
770Hz
852Hz
941Hz
Pulse Dialing & Tone Dialing
Pulse dialing
Tone dialing
Switch
Switch
Low
frequency
High frequency
DTMF matrix
35
.........
352
.........
"3, 5, ...... "
"3, 5, 2, ...... "
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