Quantum 560UF/D, 560UF/L OH (Off Hook), MR (Modem Ready), RD (Receive Data), TD (Transmit Data), (Automatic-answer), TR (Terminal Ready), CD (Carrier Detect), Seven light indicators:

CHAPTER 2. INSTALLATION

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.

ACTIVE Professional External Modem User’s Manual 3