Grass Valley NV8500 Series v.3.5 - Manual (Page 83)

67
NV8500 Series
User’s Guide
Normally, the redundant crosspoint module is in stand-by mode; it does nothing unless one of
the normal crosspoints fails.
If fail-over is automatic and a normal crosspoint card fails, the NV8280’s control card causes the
redundant card to take over for the failed card. When the redundant card becomes active, it
sends its outputs to the output cards normally supported by the failed crosspoint card.
NV8576
In an NV8576, the router’s switching matrix is distributed across 8 crosspoint cards. Each card
switches a specific subset of the inputs or outputs. Crosspoint cards are installed in crosspoint
slots 1–4 and 7–10. The optional redundant crosspoint module is installed in slots 5 and 6:
Fig. 3-2: NV8576 (Front View)
Normally, the redundant crosspoint module is in stand-by mode; it does nothing unless one of
the normal crosspoints fails.
If fail-over is automatic and a normal crosspoint card fails, the NV8576’s control card causes the
redundant card to take over for the failed card. When the redundant card becomes active, it
sends its outputs to the output cards normally supported by the failed crosspoint card.
INPUTS 289
–
576
INPUTS 1–
288
FAN
OUTPUTS
1–144
INPUTS
1–144
INPUTS 1–
288
INPUT MONITOR
OUTPUTS
289–432
(8 cards)
OUTPUTS
577–720
(8 cards)
OUTPUTS
865–1008
(8 cards)
OUTPUT MONITOR
(16 cards)
INPUTS
289–432
(16 cards)
OUTPUTS 1–576
OUTPUTS
145–288
(8 cards)
INPUTS
145–288
(16 cards)
INPUTS
433–576
(16 cards) (not used)
FAN
OUTPUTS
433–576
(8 cards)
OUTPUTS
721–864
(8 cards)
OUTPUTS
1009–1152
(8 cards)
SEC. CONTROL
PRIM. CONTROL
INPUTS 289
–
576
INPUTS 1–
288
INPUTS 1–
288
INPUTS 289
–
576
INPUTS 289
–
576
REDUNDANT CROSSPOINT
(8 cards)
OUTPUTS 577–1152
1 2 3 4 7 8 9 10 5, 6
CROSSPOINT
SLOTS
INPUT
MONITOR
OUTPUT
MONITOR
Inputs 1–288 are received by cros-
spoint cards 1, 2, 7, and 8.
Inputs 289–576 are received by
crosspoint cards 3, 4, 9, and 10.
Outputs 1–576 are distributed by
crosspoint cards 1–4.
Outputs 577–1152 are distributed
by crosspoint cards 7–10.