Grass Valley NV8500 Series v.3.5 - Manual (Page 80)

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Crosspoints
Overview of Crosspoints
lower 9 outputs of the output cards. The redundant crosspoint card takes over switching should
one of the primary crosspoint cards fail.
 Note that the crosspoint card slots for the NV8140 are narrower than the crosspoint slots for
the NV8144. Do not attempt to install the older (and now obsolete) EM0799 or EM0819 cros-
spoint cards in the NV8140. Physical damage will result.
The NV8280, NV8576, and NV8576-Plus have a slightly different crosspoint architecture because
they are larger routers. Each router has 10 crosspoint slots: 8 for crosspoint cards and 2 for an
optional redundant crosspoint module. The optional redundant crosspoint module acts as a
backup for any of the other 8 crosspoint cards.
Redundant Crosspoint Module
A redundant crosspoint module, if present, can substitute for a failed crosspoint card. Fail-over
to the redundant card can be automatic or manual.
A redundant crosspoint module has one or more function buttons located at the front of the
module. When an operator presses a button, the redundant crosspoint module can be set either
to take over active control from another crosspoint card or to operate in stand-by mode. This is
the button panel of the redundant crosspoint module of an NV8576:
Each numbered button represents a crosspoint card slot. The brightness of a numbered button
indicates the state of the crosspoint card:
• Off. The button is disabled (while redundant crosspoint is taking over for regular crosspoint).
• Dim. The button is enabled and the corresponding crosspoint is in active mode.
• Bright. The crosspoint is inactive and the redundant crosspoint is substituting for that cross-
point.
The buttons of the redundant crosspoint module for the NV8140 and the NV8280 are similar to
those for the NV8576 pictured above. The NV8144 does not use a special redundant crosspoint
card, but uses a second crosspoint card that functions as a backup.
For details, see Redundant Crosspoint Functions on page 71
3Gig
Redundant
XPT
ALARM
ACTIVE
POWER
1
2
3
4
7
8
9
10
STANDBY
PATH
LITE
REDUNDANT OPERATION
Button for the
redundant card
Buttons for the
normal cross-
point cards
Status LEDs for
the redundant
card