P
P
r
r
o
o
-
-
B
B
e
e
l
l
L
L
t
t
d
d
T
T
e
e
c
c
h
h
n
n
i
i
c
c
a
a
l
l
m
m
a
a
n
n
u
u
a
a
l
l
H
H
U
U
-
-
F
F
r
r
e
e
e
e
w
w
a
a
y
y
R
R
a
a
n
n
g
g
e
e
S
S
y
y
s
s
t
t
e
e
m
m
U
U
s
s
e
e
r
r
G
G
u
u
i
i
d
d
e
e
5
5
5
5
An example of this is:
Level Number
Destination
association
index
1
2
3
4
5
6
7
8
1
1
1
1
1
1
1
1
3
Destination index 1 defines a set of destinations, one for each level, that comprises -
levels 1 - 7 as dest 1 and level 8 as dest 3.
Level Number
Source
association
index
1
2
3
4
5
6
7
8
3
4
4
3
3
3
3
1
1
Source index 3 defines a set of sources, one for each level, that comprises - levels 1
and 2 as source 4, levels 3 - 6 as source 3 and levels 7 and 8 as source 1.
Source and destination associations have different properties due to the distributive
nature of the router i.e. one source may feed to many destinations but a destination
may only have one source routed to it. One user may route the same source as
another without affecting each other. However, routing a source to the same
destination as another user obviously does affect each other. Therefore, a source
association index may contain the same source number on a given level as another
index but a destination association index should contain unique physical destination
numbers. This avoids operational confusion as the system does not check or prevent
this condition.
A user may require one button to set the sources across all the levels and another
button to set only the audio sources. In order to do this special associations are used.
