User Manual

AXELL OPTICAL MASTER UNIT
PRODUCT DESCRIPTION AND USER’S MANUAL
40 © Axell Wireless Ltd
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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When the OMU has been installed at site and the remote communication has been enabled, the OMU
can be integrated to the Axell Element Manager. This is done by the operator of the AEM. After
entering the telephone number to the OMU, the AEM dials up the OMU, downloads all the OMU
parameters and statuses into a database. When all parameters have been downloaded, the AEM
configures the OMU with the telephone number where alarms and reports should be sent, and
optionally with a secondary telephone number where the repeater can dial in case connection to the
primary number fails.
When heartbeat reports and alarms are sent from the OMU to the AEM also the latest information
about the status and RF-configuration is included. This means that the AEM operator always has
information about the current status in the AEM database (and do not need to call the repeater to find
this out).
Note! Once the OMU is integrated to the AEM, all changes to the OMU should preferably be done
from the Axell Element Manager in order to ensure that the database always contains correct
information.