Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 678)

3−Stage Switching
H−2 VM 3000 Installation and Operating Manual
VM 3000 CONTROL SYSTEM INSTALLATION
Note 1: For the purpose of the following discussion, redundant VM boards, if any, are ignored. Recall that redun-
dant VM boards have the same logical name.
Figure H−2 shows two logical (named) levels: the video level and one audio level of a 512 x 512 three−stage switcher. Within
each logical level are a total of 2560 outputs: 1024 outputs in the input stage, 1024 in the intermediate stage, and 512 in the
output stage.
A separate VM 3000 is installed for each logical level, as shown.
Note 2: You can assign a VM 3000 to more than one logical level, up to an absolute maximum of eight logical
levels.
Note 3: You cannot split a logical level between two separately−named VM 3000s.
Note 4: A VM 3000 used to control a three−stage switcher must not be used to control any other devices
(e.g., no control panels, machines, remote routers, VGA displays, or party line panels).
CROSSPOINT BOARD LEVEL SETTINGS
The switcher hardware is restricted to a maximum of 1024 outputs per physical level. These physical levels are identified
by jumper settings on the motherboards.
In Figure H−2, three physical levels will be needed to control the 2560 outputs of each logical level. Notice that within a
logical level, the physical levels must be set consecutively. In this example, the physical levels are 1, 2, and 3 for video; and
10, 11, and 12 for left audio. Leaving a gap (such as between 3 and 10) is recommended to simplify future expansion.
Notice that the physical level numbers start at the output stage outputs of the switcher and work backwards.
CROSSPOINT BOARD INPUT SETTINGS
In a Venus 512 x 512 three−stage switcher, all crosspoint boards are jumpered for inputs 0−31.
CROSSPOINT BOARD OUTPUT SETTINGS
The crosspoint boards within each physical level are jumpered normally, i.e., according the set of outputs they control (0−31,
32−63, etc.).