M E R L I N U 7 4 0 U S E R G U I D E 2 8
GU-90023
Revision A
4
DETERMINE MERLIN STATES
In This Section
•
Determine the current state of your UMTS Merlin, by interpreting the cadence (flashing sequence) and
colour of the Light Emitting Diode
The Light Emitting Diode (LED) is a device that lights up when power is applied to it. Interpreting the LED’s
flashing sequence and color, will provide you with the current state of your UMTS Merlin. See Table 1 below.
Cadence
(flashing
sequence)
LED
Display
Merlin State
Cause
Remedy
(1/4sec) 250ms ON
(1/4sec) 250ms OFF
RED
Merlin trying to read SIM
The modem is unable to
read the SIM.
An error has occurred in the
modem firmware.
See
Section 5,
Problem 5
ON (Not flashing)
RED
Merlin Searching for wireless service
The Merlin is not receiving a
signal from the wireless
network
See
Section 5,
Problem 6
(1/4sec) 250ms ON
(1 3/4sec) 1750ms
OFF
BLUE
Your Merlin is currently receiving a
UMTS circuit switched (CS) signal
from the network and has registered
on the circuit switched (CS) domain
(1/4sec) 250ms ON
(1/4sec) 250ms OFF
(1/4sec) 250ms ON
(1 3/4sec) 1750ms
OFF
BLUE
Your Merlin is currently receiving a
UMTS packet switched (PS) signal
from the network and has registered
on the packet switched (PS) domain
(also CS i.e PS or PS+CS )
ON (Not flashing)
BLUE
Your Merlin is currently PDP context
activated on the UMTS system.
(1/4sec) 250ms ON
(1 3/4sec) 1750ms
OFF
GREEN
Your Merlin is currently receiving a
GSM circuit switched (CS) signal from
the network and has registered on
the GSM circuit switched (CS) domain
(1/4sec) 250ms ON
(1/4sec) 250ms OFF
(1/4sec) 250ms ON
(1 3/4sec) 1750ms
OFF
GREEN
Your Merlin is currently receiving a
GSM/GPRS packet switched (PS)
signal from the network and has
registered on the GSM/GPRS packet
switched (PS) domain. (also CS i.e PS
or CS)
ON (Not flashing)
GREEN
Your Merlin is currently PDP (Packet
Data Protocol) context activated on
the GSM/GPRS system
