LED Status
Modem LEDs
LED
LED Activity
LED Definition
Trouble-
shooting
Flashing Orange
Communicating
TX-Transmit
Out Not
Communicating
No Action
needed
Flashing Orange
Communicating
RX-Receive
Out Not
Communicating
No Action
needed
Green
Signal to the connected
device that the modem
is ready to receive data.
CS is set to on by
default. This signal is an
output of the modem.
No Action
needed
CS-
Clear to Send
(CTS)
Out
Modem is not ready to
receive
Do a factory
reset of the
modem
Green
Signal is an input to the
modem. Device is ready
to receive data from the
modem
No Action
needed
RS-
Request to
Send
(RTS)
Out
No Handshaking is
being used or device is
not communicating with
the modem
No Action
needed
Green
DCD signal: modem
connected
No Action
needed
CD-
Carrier Detect
(DCD)
Out
Modem is off-line
No Action
needed
Green
DTR signal: modem
connected
No Action
needed
TR-
Data Terminal
Ready
(DTR)
Out
No DTR signal coming
from the connected
device
No Action
needed
Green
On-line: Originated Call
Off-line: Automatic
Answer on
AA should be
on while off-
line. If not,
verify that
S0>0
AA-
Auto-Answer
Out
On-line: Answered Call
Off-line: Incoming Ring
No Action
needed
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