Led Indicators - Multitech MULTIMODEM MT5600ZDX Owner's Manual

Chapter 2 - Installation

LED Indicators

The MT5600ZDX has ten LED indicators (Figure 2-3) to report
MT5600ZDX status (such as verifying proper installation) and line
activity (such as monitoring the status of a connection).
Figure 2-3. MT5600ZDX Front Panel
TD
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 MT5600ZDX.
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.
RD
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
MT5600ZDX are presented on this line. When no carrier signal is
being received (pin 8 negative), this line will be forced into a marking
condition. The RECEIVE (RD) LED indicates the status of this signal.
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