Multitech V.90/K56FLEX MT5600ZDXV - Manual (Page 20)

20
Models MT5600ZDX & ZDXV
LED Indicators
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).
Figure 2-4. Modem 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 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.
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 modem are presented on this line. The
RECEIVE (RD) LED indicates the status of this signal.
CD
Carrier Detect. This LED lights when a valid carrier signal from
another modem is detected.