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DIALING/COMMUNICATION CONTROL
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3
3.3 FAX Automatic Switching
3.3.1 General functions
There are two types of setting for the FAX Auto-Switching Mode Selection: TEL Mode and FAX Mode.
3.3.2 TEL mode
This mode is selected to prioritize telephone communication when the frequency of the fax reception is
low. When the TEL mode is selected, the automatic FAX reception function does not work. Therefore,
when a calling signal comes from the exchange, the telephone ringer continues ringing until the opera-
tor picks up the handset. When the operator has learned that the caller is sending a FAX, he has to per-
form the manual reception operation.
3.3.3 FAX mode
This mode is selected when the telephone circuit is used only for FAX communication. When the FAX
mode is selected and a calling signal comes from the exchange, the FAX reception operation starts
automatically without ringing the telephone ringer.
In the FAX mode, a calling number can be set up to 15 calls in the SET FUNCTION (FUNC 14 Bits 7 to
4).
<Method of judging CNG detection>
• As shown above, after CNG-on detection time T1 (175 ms) and CNG-off detection time T2 (350 ms)
have elapsed, and the T1 period has been turned on and then the T2 period off, CNG is determined
to have occurred once.
CNG
0.5s 3s
CNG-on detection T1
CNG-off
detection T2
CNG-determined