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System considerations
Using identical sync
sources
Using the Expansion port
to gang two ECOs
Testing the backup source
ECO8000 Series Automatic Changeover Unit User Manual
It is recommended that the primary and backup sync sources be identically
configured. If the two sync source generators have significantly different
configurations, it may cause a source switch when both of the sync sources lose
power.
To understand this, consider the following scenario. If power is cut to both of the
sync sources, the sync signals will fail as the power supples on the generators turn
off. If the signal output from one of the sync generators is maintained longer,
then the ECO8000 Series may detect one input as good and the other as bad and
switch to the "good" sync source.
This might happen if the backup sync generator has only a few black outputs,
but the primary sync generator has many blacks, audio and SDI signal outputs.
The difference in the number of outputs loading the power supplies will make
the primary sync generator turn off faster. This causes the ECO8000 Series to
detect the primary source as failed while the backup is still working, resulting in
a source switch.
The ECO8000 Series detects the loss of AC power and inhibits source switching to
mitigate this issue. However, it can still occur in extreme cases. If it is necessary
to have differently configured sync generators on the primary and backup inputs,
it is recommended that you thoroughly test the loss of power condition during the
system qualification testing.
The ECO8000 Series has the ability to connect two instruments so that they
function as a single larger switch. This function is useful in situations where
more channels are needed than can be supported using only one instrument. One
instrument operates as a master unit and the other as a slave unit.
A slave unit may change state if the master unit is changed from master to
disabled or if the interconnection cable is removed. It is recommended that
you configure the master and slave units during system setup and that you not
change the configuration while the instrument is in operation. To help enforce this
recommendation, the ECO8000 Series must be in Manual mode before you can
change the state of the expansion port. (See page 35, Configure the Expansion
port.)
Tektronix recommends that you test the backup sync source every 6 months. The
ECO8000 Series keeps track of the last time the source was changed from primary
to backup and visa-versa. If it has been more that 6 months since a source switch,
then an event will be entered in the Event Log. You can also configure any of the
reporting methods (SNMP trap, e-mail, GPI signal, instrument beeper) to generate
an output when the backup test is due. (See page 83, EVENT submenus.)
Getting Started
11
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