OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1
Page | 40
In the example the reply to AT+CSQ is
0,7 meaning 7*2 dB above -113 dBm;
the modem detects a signal level of -99
dBm.
Problem 2a
OMU is configured properly, and answers the incoming call, but when trying to dial the OMU using an analogue
mode, no modem handshaking is heard from the dialling modem.
Problem 2b
When dialling the OMU, the OMU answers the incoming call, but no connection is established, and after a while
the OMU disconnects the call.
Solution
The most common cause is that the number called is the voice number of the SIM, not the data number.
Therefore, make sure to dial the data number.
If data call is used, the problem probably is an illegal modem initialization string.
In order to change the modem string, go to the OMU command prompt. Try changing the modem initialization
string and log out to let the controller reinitialize the modem.
If problem remains, try a few different modem initialization strings. Axell Wireless has been successful with the
following modem initialization strings:
AT+CBST=71,0,1;\Q3
AT+CBST=7,0,1;\Q3
AT+CBST=0,0,1;\Q3
AT+CBST=0,0,1;\Q3
AT+CBST=7,0,3;\Q3
Please refer to the modem manual for detailed description of the modem initialization strings.
Problem 3
It is possible to call the OMU from another GSM mobile, but not from an analogue modem.
Solution
This problem is most likely related to the modem configuration and/or the configuration of the IFU
unit. Try to decrease the communications speed and make sure that the modem error correction is
supported by the IFU. Verify the IFU configuration to see if there are any known problems with the
modem connections.
Problem 4
When dialling the OMU, or when the OMU is dialling the Element Manager, the connection is
terminated before the handshaking is completed.
Solution
When an OMU is answering an incoming modem call, or calling up the OMC to deliver an alarm or a
report, the OMU will wait a configurable number of seconds for the call to be established. If no
communication is established within this time, the call will be hung up. If this interval is set too low,
the handshaking is terminated too fast. In the RMC, verify the Modem Connect Time to see that it is
set to at least 30 seconds.
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