![]() PIN 22: (Ring Indicator): The ringing indicator means the DCE informs the DTE that the phone is ringing. ![]() PIN 21: (Signal Quality Detector) This pin Indicates the quality of the received carrier signal because the transmitting modem must be sent 0 or either 1 at each bit time, the modem controls the timing of the bits from the DTE. PIN 15, 17, 24 Synchronous modems use the signals on these pins. Normally this signal is used by DCE auto-answer mode. PIN9: This pin is a DTE serial connector, this signal follows the incoming ring to an extent. This signal is activated when a suitable carrier is established between the local and remote DCE devices. PIN 8: This pin is also known as received line signal detector carrier detect. The DCE and DTE work properly across the serial interface and the pin-7 must be connected both ends without interface would not work. PIN 7: This pin is the common reference for all signals, including data, timing, and control signals.
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