User Manual

AXELL OPTICAL MASTER UNIT
PRODUCT DESCRIPTION AND USER’S MANUAL
38 © Axell Wireless Ltd
or
NO CARRIER
will be displayed almost immediately.
Try to change the modem initialization string. The modem initialization string mainly used to
configure the remote communication is AT+CBST.
Successful modem initialization strings used by Axell Wireless includes (most common first):
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
Once the modem initialization string is entered, try again to dial up the OMU. For details on the
different modem initialization strings, please refer to the modem’s user guide.
If the setup is successful, the connect message will be brought up;
CONNECT 9600
This means that an online connection is established to the remote peer. From now on, all characters
typed on the keyboard will end up on the remote peer’s screen. Similarly, all characters typed by the
remote peer will be displayed on the screen.
In the example, the incoming call
was successfully answered, and the
remote user entered the text
message.
In order to come back to modem command mode, press +++ (three pluses) rapidly (within one
second).
Receiving
OK
means that the modem is back in command mode.
Type
ATH <enter>
This terminates the connection to the remote peer. The message
NO CARRIER
will be displayed.
3.8.5.4 Common Problems
Problem 1
When enabling the remote access for the OMU, the modem fails to log in to the network.
Solution
Signal strength from the donor site is too low. The signal strength can be read directly from the
modem. Go in to Direct Modem Access as described earlier. Use the command AT+CSQ
(documented below) to read out the signal strength.