Line Connection And Mode Change Procedure; Call To External Telephone Line - Toshiba DP120F Service Manual

Chapter 9 Dialing and Communication Procedure

1. Line Connection and Mode Change Procedure

1.1 Call to External Telephone Line

Has the ring signal been detected?
Has the off-hook signal been detected?
Forms the DC loop
If the dial tone is detected, or after 3.3 seconds
Transmits the dialing signal
Detects the facsimile switching signal
Communication
March 2000 © TOSHIBA TEC
START
NO
NO
YES
YES
YES
Off-hook processing
NO
Returns to idle
9-1 DP120F/DP125F Dialing and Communication Procedure
Reception