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Novatel Wireless GU-90023775 User Manual

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M E R L I N   U 7 3 0   U S E R   G U I D E   2 8  
 
GU-90023775 
          Revision 1 
 
 
 
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