The indicator lights (LEDs) on the front of an external modem inform what is happening during the session
communication. The location of the lights and the order in which they appear vary from one modem to another. But are usually identified by abbreviations composed of two letters. See below what they mean.
HS - The LED High Speed (High Speed) indicates that the modem is operating at its highest speed transmission.
AA - Led Auto Response (Auto Answer) indicates that the modem will automatically answer any calls. This
feature allows you to access your system even if it is not being monitored.
CD - The LED Detection Line (Carrier Detect) lights up whenever your modem detects a transmission signal, which means that the connection to the remote computer was successful. The light should go out only when one of the computers off the line and the signal drops.
OH - The Led Out Hook (Off-Hook) lights up whenever your modem is controlling the phone line. It is as if
you were taking the phone.
RD - Led Receive Data - (Receive Data) flashes when the modem is transferring data to the computer.
This happens whenever data is being received from a remote computer.
SD - Led Sending data (Send Data) flashes each time the computer transfers data to the modem, and whenever data are being sent to the remote computer.
TR - Led Terminal Ready (Terminal Ready) lights when the modem detects a signal DTR your program
communication. This signal tells the modem that the communication program has been loaded and is ready to run.
MR - The LED Ready Modem (Modem Ready) lets you know that your modem is connected and ready to work.
Source: Evolution of Computers
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