Grass Valley NV8500 Series v.3.5 - Manual (Page 99)

83
Router Control
The routers’ control cards receive commands from an external router control system (typically,
the NV9000) and in turn send commands to the input, output, crosspoint, and monitor cards for
execution. The control card also sends the status of the router, its power supply, fans, and video
reference to the router control system.
There are two control cards available: the EM0666 card for router frames with only standard I/O
cards installed and the EM0833 card for frames with at least one hybrid I/O cards installed. The
installation of any hybrid I/O card requires that all crosspoint cards and all control cards also be
hybrid.
Each router frame has two control card slots: one is for an active control card and the other is for
a stand-by control card. Both control cards must be either standard or hybrid.
For a list of control cards available and part numbers, see Control Cards on page 219.
Topics
Overview of Control Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Installing Control Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Making Router Control System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Overview of Control Cards
Every router has a primary control card. An optional secondary control card can be installed as a
redundant, standby card. Both control cards receive commands from the router control system,
but only the active control card responds. Because both cards receive commands, if the active
control card fails, the standby control card automatically takes over without interruption. In
addition, the primary control card and secondary control card communicate with each other so
that should a card fail, the remaining card communicates the failure to the router control
system.
The control card receives power from the motherboard and includes a status reporting circuit.
Four LEDs on the front of the control card indicate the card’s status: low battery (red), alarm
(red), active (yellow), and operating normally (green). For more information, see
Indicator LEDs
on page 193.