Grass Valley NV9648 v.1.1 - Manual (Page 63)

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NV9648
User’s Guide
Operating Concepts
Levels
In NV9000-SE Utilities and in the NV9000 router control system, routes occur on levels. A level is
typically SD, HD, analog video, AES, analog audio, or machine control. Various devices are
defined as sending and receiving signals on certain levels. The set of levels handled by a device
belong to what is called a level set.
A source can be routed to a destination if it has the same set of levels, i.e., it belongs to the same
named level set. A source can be routed to a destination in a different level set if the NV9000
configuration has the appropriate mapping.
Levels are usually called “virtual levels” in NV9000-SE Utilities.
The effect of this is that when you, the operator, choose a destination, the NV9000 recognizes
which source devices are allowed to be routed to the destination and limits your selection to
those sources.
Breakaway
Routes can be “all-level” in which case they are taken on all levels defined for the destination.
The acceptable sources for a route have the same levels as, or some configured mapping to, the
levels of the destination.
A breakaway is where you take different sources to the same destination — on different levels.
It is not possible to take different sources to the destination on the same level. For instance, you
cannot take SD from two different sources. The outcome would be noise even if you could do it.
(Routers are not mixers.)
Level Grouping
Virtual levels can be grouped. This diagram illustrates grouping:
There are two types of virtual levels: basic and abstract. Basic virtual levels are those that
correspond to actual physical levels. Abstract virtual levels do not correspond to physical levels.
In the illustration, the 5 “Audx” levels are grouped under ‘Audio’. The two video levels are
grouped under ‘Video’.
The levels ‘Video’ and ‘Audio’ are abstract levels; the other levels are basic levels.
 If you have chosen a destination whose basic levels are grouped, the panel’s selection
buttons show only the basic level names. (Other panels can show level group names.)
We discuss level groups — a feature of the router control system — only to state that the NV9648
does not have support for level groups.
HD SD Aud1 Aud2 Aud3 Aud4 Aud5
Video Audio
. . .