The DW4020 LEDs
•Check if the LEDs on the back of the Gateway or on or off. The LAN ports on the back of the Gateway have LEDs. See Ethernet port LEDs on page 94.
•Contact Customer Care. If the corrective actions described in this chapter and Chapter 3 – The User Interface do not solve the problem, contact technical support.
The receive modem has a RX and a READY LED. The transmit modem has a TX and a READY LED. The Gateway has a STATUS and READY LED.
Note: Whenever the LEDs do not function properly as described below, check to be sure you have the correct power supply, PN
DW4020 LEDs status
This section describes the LEDs’ appearance during typical DW4020 operation. It also describes their appearance when some basic problem is occurring.
Normal operation, no transmit or receive
When the DW4020 is powered on but not receiving or transmitting data, it appears as shown in Figure 63. The modems’ READY LEDs are continuously lit. Both the Gateway LEDs are continuously lit.
Modems’ READY 
LEDs continuously lit
Both Gateway LEDs continuously lit
Figure 63: DW4020 normal operation, no data received or transmitted
Appendix C • Installing the DW4020 Manually
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