Appendix A ’Technical Specifications’ — Signal Processing
Amethyst III DTV Smart Switch 207
User Manual
Switches
Table A-12. Switches specifications
Density Up to 4 ASI switches
Up to 8 IP switches
Seamless
s
witch method
ASI: switch perform at TS packet boundary
IP: switch perform at IP datagram boundary
Strategy
Manual: Except for the GPI trigger in Edge mode,
the manual switching action always provides the
input switch regardless of whether the input is safe
or not. For the GPI trigger in Edge mode, the switch
request may be refused by Amethyst III if the input is
not
safe.
Redundancy: the on-air TS input remains on-air
while it is safe.
Main/Spare: the main TS input is on-air when it is
safe. When it is erroneous, the back-up TS input
becomes on-air, until the main TS input is safe again.
Mode
Automatic
Manual: GPI trigger, front panel, Web GUI, SNMP
Delay Compensation
Table A-13. Delay compensation specifications for ASI platforms
Time delay 10 seconds max
Synchronization
met
hod
Network
SFN adapter
Synchronization
wind
ow
± 500 ms max
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