Sierra Wireless RJ-11 - Manual (Page 23)

Hardware
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Table 3-5: Phone
LED Condition Description
Solid Green The port is open and idle.
Blinking Green The port is open, and data is being
transmitted or received. When data is
being continuously transferred, this LED
will blink approximately 2 times per
second.
Blinking Red Data errors will cause periodic red blinks.
Persistent red blinks may imply a
configuration problem (incorrect baud rate,
parity settings, etc.)
Yellow Port is closed.
Solid Red Port hardware has failed.
Off Power is off.