Canon FACSIMILE BASIC 2000 Service Manual page 234

G3 FACSIMILE COMMUNICATIONS
6.3.1 Tonal procedure
Transactions are performed using only tonal signals, and whether the com-
municating side is the G3 transmitting side or receiving side is notified.
The tonal procedure is also called center identification or phase A.
Overview
The transmitter transmits CNG after dialing. The receiver responds to the
call up and returns CED.
5–92
Calling Side (transmitter)
Dial
This is an auto-dial
facsimile.
CNG Transmission
This signal notifies the other party that the facsimile is an auto-dial fac-
simile.
CNG can be output even on manual transmission transmitters.
Some receiver models have a function for switching to the facsimile
when CNG is received.
CED Transmission
This signal notifies the other party that reception is automatic.
CED can also be output even during manual reception.
CNG
CNG
CED
Fig. 5-66 Tonal Procedure
Reception
Reception
Called Side (receiver)
Call
Response
This is an auto-reception
facsimile.
Tonal signal
Tonal signal