Chapter 6 – Application Notes
LED Interface
The LED signal indicates the SocketModem working status. Refer to the mechanical drawing for LED locations.
LED 1 – Heartbeat – IP and –GP Builds Only
LED 1 Signal
Heartbeat LED
OFF
No power to the unit.
Blinking
Power on.
LED 2 – Link Status – All Builds
LED 2 Signal
Link Status LED
OFF
No power to the unit.
ON
Continuously lit
Slow blink (-0.2Hz)
Faster blink (-3Hz)
Note:
For non-IP builds, to ensure that the Link Status LED works properly, issue the following AT Command
sequence to the GPIO:
AT#GPIO=1,0,2
AT#SLED=2
LED 3 – Signal Strength –IP and –GP Builds Only
LED 3 Signal
Signal Strength LED
OFF
No signal.
GSM
HSDPA
Blinking
The faster the LED blinks, the stronger the signal.
1.5 s flash
GSM
HSDPA
600ms flash
GSM
HSDPA
200ms flash
GSM
HSDPA
SocketModem Cell HSPA and SocketModem iCell HSPA MTSMC-H5 Device Guide
Powered and connected, but not transmitting or receiving.
Powered and searching for a connection.
Transmitting or receiving.
+CSQ
99
99
+CSQ
5-10
4-10
+CSQ
11-20
11-20
+CSQ
21-31
21-31
CHAPTER 6 –APPLICATION NOTES
28
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