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NV8500 Series
User’s Guide
LED turns off. The redundant card’s active LED turns on, the button labeled 2 turns bright, and
the ‘Standby’ button turns dim. All the other buttons turn off.
The same applies to any of the other crosspoint cards.
You can place the redundant card in standby mode by pressing its ‘Standby’ button. You
must
press the ‘Standby’ button before you can substitute the redundant card for another crosspoint
card.
Manually Changing the Redundant Crosspoint
Always close the door of the router as soon as possible after completing any crosspoint
operations.
It is possible to perform switch-over locally at the router or remotely through MRC.
These methods do not apply to the NV8144 which does not use a redundant crosspoint module
per se.
To make a crosspoint card inactive
Press the numbered button on the redundant crosspoint module. Choose the button whose
number matches the slot of the crosspoint card you want to deactivate. The redundant cross-
point module immediately substitutes for the inactive crosspoint card.
To place the redundant crosspoint module in standby mode
Press ‘Standby’ on the redundant crosspoint module. Any deactivated crosspoint card becomes
active again.
Note that you cannot deactivate another crosspoint card without first pressing the ‘Standby’
button. Buttons for other crosspoint cards turn off when any crosspoint is inactive.
Remote Operation of the Redundant Crosspoint
MRC’s ‘Redundant Crosspoint’ page contains a graphic image of the redundant crosspoint
button panel of a selected router. By clicking on the “buttons” of this image, MRC users can
effect redundant crosspoint switches manually.
(The image in MRC also reflects redundant crosspoint switches made either automatically or by
other operators.)
Operating the redundant crosspoint buttons in MRC is exactly like operating the buttons of the
actual redundant crosspoint module. See the
MRC Users Guide
for reference.
Null Audio
When a router configuration includes “null” audio sources, control panel operators can control
whether embedded audio channels are null. Individually, null channels carry silence. When all 4
channels in an audio group are null, the output embedder does not emit the group in the
output.
Note that although a null audio source is called a source, it
does not
actually carry audio. It is an
artificial port. Using that port signals to the router’s control card that generated silence should
be applied at the output.
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Страница 134: ...118 Alarms Making Alarm Connections ...
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