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Canon fax basic 2000 Manuale Di Servizio

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G3 FACSIMILE COMMUNICATIONS
5–92
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.
Fig. 5-66   Tonal Procedure
Overview
The transmitter transmits CNG after dialing. The receiver responds to the
call up and returns CED.
CNG
Transmission 
→
 Reception
Tonal signal
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 
←
 Reception
Tonal signal
This signal notifies the other party that reception is automatic.
CED can also be output even during manual reception.
Call
CNG
CNG
CED
Dial
Response
This is an auto-reception
facsimile.
Calling Side (transmitter)
Called Side (receiver)
This is an auto-dial
facsimile.