Oki OKIFAX 5750 Service Manual page 308

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TAD mode flow chart
1) In case of TYPE2:
If the fax does not CNG signal during working of TAD, the fax will go to standby state.
2) In case of TYPE 3:
The fax does not detect CNG signal during 15 seconds from TAD operation starting. The fax starts CNG signal detection after 15 seconds from TAD operation.