Grass Valley NV8500 Series v.3.5 - Manual (Page 81)

65
NV8500 Series
User’s Guide
Automatic Fail-Over
The router’s control card can be configured to cause the redundant crosspoint module to take
over for a failed crosspoint card automatically. Otherwise, an operator can switch the redundant
crosspoint manually. (The manual switch-over can be performed remotely through MRC.)
It is in MRC’s ‘Redundant Crosspoint’ page that automatic switch-over can be configured. If
automatic switch-over is enabled, then the router’s normal crosspoint cards can be prioritized so
that in the rare event that two crosspoints fail at the same time, the redundant crosspoint will
substitute for the crosspoint having the highest priority.
(In the NV8144, there is only one active card, so priority is moot.)
Crosspoint Card Status
The crosspoint cards and the redundant crosspoint module have status reporting circuitry.
Three LEDs on the front of the card or module indicate the card’s status: alarm (red), power is
good (green), card is active (amber). Two other LEDs indicate whether there is good (green) or
bad (red) communication with the control card. For more information, see
Indicator LEDs on
page 193.
Signal Flow Through Crosspoint Cards
(As a reminder, standard input cards have 9 inputs and standard output cards have 18 outputs.
Hybrid disembedder cards have 8 inputs, the 9th connector being unused. Hybrid embedder
cards have 16 outputs, the 9th and 18th connectors being unused. Hybrid MADI input cards
have 8 video inputs and 1 MADI input. Hybrid MADI output cards have 16 video outputs, their
9th and 18th ports being MADI ports. See Chapter 2,
Inputs and Outputs on page 21, for details.)
NV8144
An NV8144 has slots for two crosspoint cards. One crosspoint card is active and the other is
stand-by. Both the active crosspoint card and the stand-by crosspoint card receive all inputs. The
stand-by crosspoint does nothing unless the active crosspoint fails.
The active crosspoint sends its outputs to the output cards. If fail-over is automatic and the
active card fails, the NV8144’s control card causes the stand-by to take over for the active card.
When the stand-by card becomes active, it sends its outputs to the output cards.
FAN
INPUTS
1–144
MONIT
OR
(16 cards)
SEC. CONTROL PRIM. CONTROL
(8 cards)
PRIM. XPT
(1–144)
RED. XPT
(1–144)
POWER SUPPLY POWER SUPPLY
OUTPUTS
1–144