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QMultiFlex-400™ Installation and Operating Handbook
Figure 6-54 Edit->Redundancy->1-for-1 Screen
The Redundancy status shows the 1:1 status of the modem. This will be shown as Main
when the modem is online, Maintenance when the modem has been taken out of service,
and Standby when the modem is offline, ready to switch over on a fault occurring on the
online modem.
Transmit fail switchover controls whether a switchover occurs on a transmit alarm. Likewise
Receive fail switchover controls whether a switchover occurs on a receive alarm. Checking
a checkbox activates the switchover logic, putting it in a state where the modem will switch
over when a relevant transmit or receive alarm occurs.
If both transmit and receive fail switchovers are set to 'Off' then the 1:1 redundancy system
will only switch over on unit faults and all transmit or receive traffic faults will be ignored.
Traffic warnings will never cause a switchover regardless of how the fail switchover settings
are configured.
In a 1:1 pair, the Clear 1:1 alarm button can be used on the Standby modem, when it is
exhibiting a fault, to temporarily suppress the fault condition in order to allow the Standby
modem to be forced online. This is useful when both modems in the 1:1 pair are showing
faults, but the Standby modem is exhibiting a less severe failure than the current online
modem, thereby allowing the best possible satellite service to be maintained in the
circumstances.
In a 1:1 pair, the Switch to standby button forces the modem that is online into Standby
mode. This is done by momentarily creating a fault condition that forces a switchover to
occur.
The Switch to maintenance button prevents the modem from being switched online. This
facilitates the modem being removed, for example, to be repaired or upgraded.
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