Grass Valley Trinix v.2.4.1 - Manual (Page 38)

Planning Guide
38 Planning and Installation Manual
Using a central set of fan modules to cool the main chamber eliminates
the possibility of cooling loss in one area due to failure of a single fan.
If a fan does fail, the system will continue to operate, providing a safe
interval during which the failed fan can be replaced and the system
returned to normal redundant operation.
Sync Reference Options
For synchronous vertical interval switching the same sync reference
signal must be sent to the control system (e.g., Jupiter CM-4000) and to
the Trinix. (The Trinix will operate without a sync connection but
switching will be non-synchronous.) Each sync input uses looping 75
ohm BNC connectors.
The sync signal can be NTSC or PAL black burst, or tri-level (HD) sync,
and up to four sync signals can be mixed within the same chassis on an
output-board basis. For example, NTSC sync could be used for one set
of 32 outputs and HD sync for another set of 32 outputs.
In DV-33128 and DV-33256 units, one or two independent sync signals
can be connected to a NR-33000 Broadlinx board and either of these can
then be selected for use on each output board. Adding a second Broad-
linx board provides a total of four independent sync sources.
In DV-33512 units, which are normally supplied with an SR-33500
Sync/OPM board, up to four independent sync sources can be con-
nected and any of the four can be selected for each output board. If
desired, an NR-33000 board can be installed in the associated power
supply chassis to provide Broadlinx capability. It is also possible to
divide the sync sources between the SR-33500 and the Broadlinx board
but the maximum number of sync sources is always four.
Sync Redundant mode
For all systems, two Broadlinx boards can be operated in Sync Redun-
dant mode where the sync signal(s) are looped through each board; if
the primary Broadlinx board fails the system will switch automatically
to the secondary board. However, for redundant operation the number
of sync signals is limited to two.
For sync reference details, see page 107 .
Output Monitoring
With the DV-33128 and DV-33256 chassis, two pairs of output monitor
ports are provided by the NR-33000 board (one side of each pair is
inverted). Two additional dual ports are optionally available when a
second NR-33000 is added; this would provide a total of four monitor
ports.