Grass Valley XSwitch Feb 01 2005 - Manual (Page 40)

©2001 XSWITCH Installation and Operations Manual 39
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The PVTV XSWITCH provided with dual PVTV NEWS systems and sold as a stand alone unit is intended
as an A to B mode of operation. This means that the architectural intent is such that any problem with the
natural on-line system, "A,” has a one-switch operation to run from the backup system, "B.” Furthermore,
the intent is for operators to control both systems from a single control surface regardless of the on-line
system. Architectural intent is for the off-line system to be operationally active on a second control surface
for pre-production work in normal operations or used for troubleshooting a system with problems off-line.
Due to the architectural intent of the XSWITCH it is sold with a minimum number of cards to design with
your system. Because some customers have special needs for their system, the XSWITCH has a total of
5 "switched" selections an operator can choose from for different operational functions. The individual
switch cards can be purchased separately for custom designs. Apart from the main frame which contains
the control panel, up to 3 expansion frames can be stacked, programmed and controlled by the main
frame.
The following is an example of dual PVTV NEWS system with a PVTV XSWITCH integration that utilizes
the A, B, C and D positions.
Overview
A and B position functionality remains constant in this application but added redundancy and functionality
were desired. C position was created to control the A system from the pre-production control surface.
Consideration for the C position was to compensate for the loss of a device on the on-line control surface,
i.e., computer monitor. In the event of such a failure, the operator is able to depress the C button and all
operations are switched to the off-line control surface with no change in operational status. At the time of
the switch, the on-line control surface can be repaired, (monitor swap out), without interfering with on-air
operations. D position was created to control the A system from the on-line control surface and the B sys-
tem from the off-line control surface with the exception that the B system and off-line control surface are
switched to air. Consideration for the D position was to allow a show being pre-produced to be brought to
air without the file transfers and physical relocation of the operators to occur, (the pre-production ran long
and there was no time to run the show from the normal on-line control surface and A system). Once again
this is a one button push action to initiate.
Architecture
To support the C and D positions outlined above, there is the necessity of both added hardware and rewir-
ing of certain shared devices. The changes are outlined below and are classified by the shared device
which needs to be controlled.
PVTV SHOT Director
In a normal A/B switch environment a single SHOT Director is used and integrated with a dual system.
This SHOT Director is used at the on-line control surface. A second SHOT Director is provided with dual
systems but the intent of the second unit is as a ready spare. To fully utilize the capability of the C and D
positions outlined above, the second SHOT Director will be located at the off-line control surface and both
units will be wired as illustrated in figure A-1.