User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 77 (86)
In these screens the
Ethernet and/or DNS
Gateway parameters
can be set
4.11.5 Troubleshooting Remote Communication
Since many networks have their own “personality”, performing first time configuration of the remote
communication sometimes requires tweaking of the modem parameters.
This section describes some trouble shooting techniques if configuring the OMU for remote access fails.
Radio
LinkProtocol
(RLP)
BTS
LaptopLaptop
Control Module
in OMU
Switch
Centre
ModemModem
RS232
Interworking
Function Unit
(IFU)
This illustration is a simplified schematic of the remote communication between a GSM module in an OMU
and an analogue modem. The analogue modem in the computer communicates with the Interworking Function
Unit (IFU), which is the GSM network analogue network interface. The call is routed via the switch centre over
the air interface to the data call number in the SIM-card of the GSM module.
The Control Module is responsible for establishing connections with the Axell Element Manager, and to answer
incoming calls to the OMU.
As described in previous sections, the Control Module only accepts one login at a time, either via Local
Maintenance port (LMT) or modem connection. Hence, when verifying the remote access of the OMU, it is
important to log out from the OMU locally before trying to access the OMU remotely.
Direct Modem Access
To allow for advanced trouble shooting of the communications, it is possible to access the modem directly via
the Control Module from a laptop computer.
LaptopLaptop
RS232 cable
Control Module
GSM
Module
LMT Port