OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1
Page | 30
3.10 Set up Remote Communication
The OMU can be configured with a wireless modem, a PSTN modem or an Ethernet link for the
remote communication.
3.10.1 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.
3.10.1.1 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.
3.10.1.2 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.
3.10.1.3 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.
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