Grass Valley NV9000-SE v.5.0 - Manual (Page 464)

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Tielines
Number of Tieline Paths
Tieline Graph
The graph shows the topology of the tielines defined in the configuration of the control system.
(Tielines are defined in the ‘Tielines’ page of the Configuration pane.)
The graph represents physical levels by blue rectangles and identifies the specific physical level
as the title of the rectangle.
The lines between the rectangles represent sets of tielines.
The label associated with a line has two parts:
[xxx] TOTAL and [yyy] IN USE
The number “xxx” is the number of tielines in the set. The number “yyy” is the number of tielines
in use in that set. It is possible for “yyy” to be 0.
The numbers of tielines in use, as shown in the graph, corresponds to the data in the tieline
usage section.
Note that you can drag the partition rectangles around in the graphic window to make a clearer
picture.
Number of Tieline Paths
Definitions & Notation
Let two router partitions be labeled J and K. Then we say JK is the number of tieline paths from J
to K. (Tielines are unidirectional.)
Call the number of signal types supported by tielines of a router partition the “degree” of the
partition. (For example, an SD partition might support the signal types 525i/59.94 and 625i/50.
The degree of that partition would be 2.)
A simple tieline need not support all the signal types of the partitions it connects. But for the
sake of simplicity in the calculations, we assume that all tielines support all the signal types of
the partitions they connect.
Simple Tielines
(Simple tielines are 1-hop tielines, directly connecting two partitions.)
For partitions A and B, where A has degree d
A
and B has degree d
B
, and the number of connec-
tions between A and B is N, the path count is
AB = d
A
× d
B
× N
Example:
A supports 1080i/59.94, 720p/29.97, 1080i/50, 720p/50, 1080p/23.98.
B supports 525i/59.94 and 625i/50.
There are 4 tielines defined between A and B.
The path count, AB is 5 × 2 × 4 = 40.
A
(HD)
d = 5
1080i/59.94,
720p/29.97,
1080i/50,
720p/50,
1080p/23.98
B
(SD)
d = 2
525i/59.94,
625i/50