User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 71 (86)
4.11 Set up Remote Communication
The OMU can be configured with a wireless modem, a PSTN modem or an Ethernet link for the remote
communication.
4.11.1 Communication via Modem
The Control Module is responsible for enabling the power to the modem, unlocking the SIM-card, using the
configured PIN-code and making sure the modem is logged in to the network correctly. Depending on network
configuration and modem usage, the modem might require different modem initialization strings to work
properly. This modem initialization string is set and verified during repeater setup.
4.11.1.1 Modem Initialization
After a power failure, or upon user request, the Control Module performs a full initialization of the modem.
This consists of three steps:
If the SIM-card in the modem has the PIN code enabled, the Control Module unlocks the PIN code. In case
wrong PIN-code is configured, the Control Module will not try to unlock the SIM again until the PIN-code
is changed. This avoids the SIM card being locked by a Control Module repeatedly trying to unlock the
SIM with the wrong PIN code.
Once the SIM is unlocked, the Control Module waits for the SIM to log in to the network. Depending on
signal quality and network configuration this might take a while. The Control Module will wait a
configurable number of seconds (default 50 seconds) for the modem to login to the network. In case no
network is found, a modem power cycle will be initiated.
When the modem is successfully logged in to the network, the Control Module configures the modem with
the modem initialization string as configured when setting up the remote configuration. The modem
initialization string is a network dependent string. The default string is suitable for most networks, but
some networks might require some tweaking of this string.
4.11.1.2 Monitoring Modem Connection
The Control Module constantly monitors the status of the modem connection to ensure that it is working
properly, and that the modem is logged in to the network.
In case the modem is not registered to the network, or the Control Module cannot properly communicate with
the modem, a power cycling of the modem is initiated, after which the modem will reinitialized.
4.11.1.3 Scheduled Modem Power Cycling
In addition to polling the modem to ensure the repeater online status, the Control Module can be configured to
perform an automatic power cycling on a scheduled time of the day. Power cycling the modem ensures the
latest network configuration for the modem, such as the HLR Update Interval etc.
Note! By default, the scheduled modem power cycling is disabled.
4.11.2 Communication via Wireless Modem
There are two different ways of communication for a wireless (GSM) modem:
Using data call / modem connection.
Note! This requires the SIM-card in the modem to be configured with data service.
Using SMS to configure the repeater with simple text messages
Note! SMS functionality is not implemented in this SW release.
The Axell Element Manager always uses data call communication with the repeater, why all repeaters being
controlled by the AEM must have data service enabled on the SIM card.
Configuring the repeater to send alarms and reports via SMS it is still possible to establish data calls to the
repeater, as long as the SIM card is data service enabled.