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Appendix C • Installing the DW4020 Manually
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1031484-0001 Revision 2
The DW4020 LEDs
The receive and transmit modems have LEDs on their front
panels. Both modems have a green R
EADY LED. The receive
modem has a green RX LED. The transmit modem has a green
TX LED. The LEDs’ status indicate various conditions. Table 13
describes the basic states.
The LEDs may also indicate various conditions through blink
patterns. Tables 7 and 8 explain these. The numbers in brackets
are the status codes discussed in The System Status indicator on
page 36.
If the modem does not appear to be functioning, check all cable
connections. If they are secure, cycle the power by unplugging
the power cord at the power supply and plugging it back in. A
number of conditions and corrective actions are described below.
The R
EADY LEDs should come on steadily when the DW4020 is
powered up and when it is operating. The TX and RX lights can
also blink when the DW4020 is first powered up, or when the
DW4020 is power cycled. However, that blinking does not
indicate anything about their status.
The DW4020 is extremely reliable. If you find you cannot surf
the Internet or the DW4020 seems to have a problem, follow this
sequence of steps below to identify and fix the problem.
• Check whether the DW4020 LEDs or on or off. The LEDs
may indicate that a connection has become loose.
Reconnecting a cable or power cord may restore function.
See DW4020 LEDs status.
• Check if the LEDs are blinking in a pattern. The LEDs can
blink in a pattern. The patterns correspond to the receive and
transmit status codes discussed in Transmit Status messages
on page 37 and Receive Status messages on page 42. See
LED blinking indicating status codes on page 60 for a
discussion of the blinking LEDs.
Table 13: Basic Receive and Transmit Modem LED States
Ready OFF/RX OFF Ready ON/RX Off Ready ON/RX
blinking
Receive modem Modem not functioning Modem functioning, no
data being received
Modem functioning,
data being received
Ready OFF/TX OFF Ready ON/TX Off Ready ON/TX blinking
Transmit modem Modem not functioning Modem functioning, no
data being transmitted
Modem functioning,
data being transmitted