Ericsson 1553-FGC 101 1010 Uen A Guía de usuario Pagina 211

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Setting up the SFN Functionality
Table H.1 SFN Related Static Parameters
Name Setting Comments
Reference Clock Source GPS
NTSC Reference Clock Type
PAL
Gives an HSYNC type input to the
Encoder. Locked to 1PPS.
Reference Clock Output
Enabled
If the primary inputs (GPS A) fail and
there is a signal on the secondary
input, the unit will switch to GPS B.
Reference Clock Redundant
Switch
Disabled No switching available.
Enabled
After a failure if the signal reasserts
itself on the primary inputs, the unit
will switch back
Reference Clock Redundant
Revert
Disabled No switching available.
GPS Terminate Input A Enable/Disable
2
GPS Terminate Input B Enable/Disable
Enabled: Termination is 50 Ω.
Disabled: High impedance
Caution!
Although the synchronization signal is 1 pulse per second, correct termination and
cable impedance are necessary to ensure a clean pulse edge for consistent
reference timing.
2
Termination: If units are daisy-chained, all inputs must be high impedance [Disabled] except the last one in the chain which must be set to
Enabled [Terminated].
2/1553-FGC 101 1014 Uen B
H-9
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