User Manual

AXELL D-CSR 3302 US VHF REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
48 Doc PN 0034B-UM Rev. 2.1 © Axell Wireless Ltd
LaptopLaptop
RS232 cable
Control Module
GSM
Module
LMT Port
8.3 Troubleshooting Remote Communication
Please also refer to the document Common Command and Attributes for guidance.
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 repeater for
remote access fails.
The illustration below is a simplified schematic of the remote communication between a
GSM modem in a repeater 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 repeater.
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 repeater, it is important to log out from the repeater locally before
trying to access the repeater remotely.
8.3.1 Direct Modem Access
To allow for advanced trouble shooting of the communications, it is possible to connect
directly to the modem by opening the repeater and connecting to the Control Module from a
computer.
Log in to the repeater, either with RMC, or with a terminal emulation program, such as
HyperTerminal™.
When the login is completed, select Terminal Mode, this will give access to the repeater
command prompt in the same way as with HyperTerminal.
When the repeater prompt is accessible, type in the command
ACCESS MODEM <Enter>.