Multitech MT5600ZDXV Benutzerhandbuch

The modem has ten LED indicators to report its status (such as verifying

proper installation) and line activity (such as  monitoring the status of a

connection).

Transmit Data.  The TD LED flashes when data is being

transmitted (on for a space, off for a mark). Signals on this circuit

are generated by the terminal and transferred to the transmitter of

the modem. The transmitting terminal should hold this

line in the marking state when no data is being transmitted,

including intervals between characters or words. The TRANSMIT

(TD) LED indicates the status of this circuit.

Receive Data.  The RD LED flashes when data is being

received (on for a space, off for a mark). Data signals received

from the remote  modem are presented on this line. The

RECEIVE (RD) LED indicates the status of this signal.

Carrier Detect.  This LED lights when a valid carrier signal from

another modem is detected.