Q. Show the Function of Signals?

- TD transmitted data

- RD received data

- DSR data set ready

• Indicate whether DCE is powered on

- DTR signifies data terminal ready

• Indicate whether DTR is powered on
• Turning off DTR results modem to hang up the line

- RI denotes ring indicator

• ON when modem detects phone call

- DCD: data carrier detect

• ON when two modems have negotiated effectively and the carrier signal is established on the phone line

- RTS denotes to request to send

• ON when DTE wants to send data
• Utilized to turn on and off modem's carrier signal in multi-point (that is multi-drop) lines
• Usually constantly ON in point-to-point lines

- CTS denotes clear to send

• ON when DCE is prepared to receive data

- SG denotes signal ground