User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 82 (86)
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.
4.12 Integrate into the AEM
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.