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LED Status
Modem LEDs
LED
LED Activity
TX-Transmit
Flashing Orange
Out
RX-Receive
Flashing Orange
Out
CS-
Green
Clear to Send
(CTS)
Out
RS-
Green
Request to
Send
(RTS)
Out
CD-
Green
Carrier Detect
(DCD)
Out
TR-
Green
Data Terminal
Ready
Out
(DTR)
AA-
Green
Auto-Answer
Out
LED Definition
Communicating
Not Communicating
Communicating
Not Communicating
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.
Modem is not ready to
receive
Signal is an input to the
modem. Device is ready
to receive data from the
modem
No Handshaking is
being used or device is
not communicating with
the modem
DCD signal: modem
connected
Modem is off-line
DTR signal: modem
connected
No DTR signal coming
from the connected
device
On-line: Originated Call
Off-line: Automatic
Answer on
On-line: Answered Call
Off-line: Incoming Ring
Trouble-
shooting
No Action
needed
No Action
needed
No Action
needed
Do a factory
reset of the
modem
No Action
needed
No Action
needed
No Action
needed
No Action
needed
No Action
needed
No Action
needed
AA should be
on while off-
line. If not,
verify that
S0>0
No Action
needed
10
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