Multi-Tech Systems MT4X56USB - Manual (Page 9)

Chapter 1 - Introduction and Description
MT4X56USB 9
Front Panel
The front panel has four groups of LEDs that provide the status of the four port connections, plus a
LED that provides the status of Hub activity and and a LED that provides the status of System
activity.
Figure 1-2. Front Panel
Modem Ports (Ports 1, 2, 3, and 4)
Modem LEDs are Green and indicate the following:
RD The Receive Data indicator blinks when the modem is receiving data.
TD The Transmit Data indicator blinks when the modem is transmitting data.
CD The Carrier Detect indicator is lit when the modem detects a carrier signal.
TR The Terminal Ready is lit when the modem is communicating with the peripheral.
Hub
Hub status LEDs indicate the following:
Green A steady Green light indicates that the downstream (Type A) is powered on.
Off If the Hub LED is Off, it indicates that there is something wrong with the hub (drivers
aren’t loaded correctly or the downstream device may have caused an overcurrent
condition).
Note: If the MT4X56USB is powered on but the USB cable is not attached, the Hub LED
will be Off. When the USB cable is attached, the LED turns Green.
System
System status LEDs indicate the following:
Red A steady Red light signifies a loss of USB communication with the host. If the loss is due
to unplugging the unit, it will begin blinking Red (before turning steady Green) when it is
reconnected. A steady Red light also indicates a problem with the drivers (fixed by
reinstalling the drivers). A blinking Red light occurs during software installation and will
continue to blink Red until installation completes.
Amber Signifies serial port activity.
Yellow This LED may blink on and off during software installation until installation is complete.
Green A steady Green signifies that the serial ports have been successfully set up and the
MT4X56USB is operating normally.