Multi-Tech Systems MT5600ZDX - Manual (Page 13)

13
Owner’s Manual
Figure 2-3. MultiModemZDX 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 MultiModemZDX. 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 MultiModemZDX 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.
56
V.90 or K56flex. This LED is lit when connected to an ISP-type K56flex
server. The actual connection speed is contingent upon server
capabilities and line conditions.