Quantum 560UF/L - Manual (Page 7)

CHAPTER 2. INSTALLATION
ACTIVE Professional External Modem User’s Manual
3
THE FRONT PANEL: 560UF/L & 560UF/D External Modem
The front panel consists of seven light indicators, a 7 segment LED and five
switch buttons which are explained as follows:
Seven light indicators:
MR (Modem Ready): This light indicates the modem is ready for AT
command.
TR (Terminal Ready): This light is ON when the terminal or PC (Data
Terminal Equipment) is ready to send or receive data, i.e. when the Data
Terminal Ready signal is ON.
CD (Carrier Detect): The Carrier Detect light is ON when a connection is
made with another modem, or when the AT&C0 command is issued.
TD (Transmit Data): This indicator is ON and flashing when the terminal
transmits data to the modem.
RD (Receive Data): This indicator is ON and flashing when the terminal
receives data from the modem.
AA (Automatic-answer): Lights up when the modem has been set to
automatic-answer mode. Also flashes when the modem has detected
incoming rings.
OH (Off Hook): Lights up when the modem uses the telephone line (in the
data mode). The OH indicator goes out when the modem hangs up the phone
line or when it is in the Talk mode.