Installing and putting a SINAUT modem into operation
5.4 GPRS/GSM wireless modem MD741-1
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
189
LED displays of the MD741-1
The following tables summarize the meaning and activity of the LEDs on the front of the
modem.
Table 5- 5
Meaning of the LEDs (DC5V, STAT, LINK, VPN) on the front panel of the MD741-1
LED
Color
Status
Meaning
ON
Device turned on, power supply present
DC5V
Green
OFF
Device turned off, no power supply
ON
Ethernet connection to local computer or LAN established
LINK
Yellow
OFF
Ethernet connection to local computer or LAN not established
ON
VPN tunnel established
1)
VPN
Yellow
OFF
VPN tunnel not established
1) Shortly after turning on the MD741-1, the VPN LED is lit briefly although the VPN tunnel is not active. Cause: Self-test of the components
while the device boots.
Table 5- 6
Meaning of the LEDs (S, Q, C) on the front panel of the MD741-1
LED
Status
Meaning
S, Q, C together
Flash on and off in sequence
(fast)
Flash on and off in sequence
(slow)
Flash fast (in sync)
Booting
Update
1)
Error
S (Status)
Flashes slowly
Flashes fast
OFF
ON
Waiting for PIN input
PIN error/ SIM error
No GPRS connection
GPRS connection exists
Q (Quality)
Flashes slowly
Flashes once at intervals
Flashes twice at intervals
Flashes three times at intervals
Always ON
OFF
Logging into GSM network
Field strength not adequate or unknown
2)
Field strength adequate
Field strength good
Field strength very good
Waiting for PIN
C (Connect)
OFF
ON
No connection
Connection to partner (with GPRS: Authentication and IP
assignment were successful)
Flashes slowly once per second; flashes fast: 4 times per second
1) During an update of the communication software, the LEDs first flash slowly in sequence. Later, only the S LED remains ON.
2) Shortly after logging in, the field strength is always signaled as minimal or unknown by the Quality LED flashing once. Cause: At this point in
time, the device has only detected that there is a field strength present. The actual calculation of the field strength takes place at the next
check after 15 seconds.
Service interface X1
This service interface is required when a firmware update is necessary for the modem
section of the MD741-1.