Grass Valley CR Series v.3.2 - Manual (Page 193)

181
CR Series
User’s Guide
AES Routers
Under an NV9000 control system, AES compact routers perform stereo switching only, regard-
less of how they are configured.
 Note that, during configuration, the AES inputs and outputs must be numbered as if they
were paired mono channels. See
Devices on page 175 for configuration information.
Loss of Reference
Let N be the nominal size of the router, 16 or 32.
If an AES router transitions from synchronous mode to asynchronous, it re-writes the 2N×2N
matrix as an N×N matrix and the 2N×2N route table is lost. That is one of the reasons for the
15-minute delay before such a transition.
When the AES router re-writes the matrix, it attempts to preserve as much of the 2N×2N infor-
mation as possible. Thus,
• If an output pair has a “left” signal from input N in its “left” channel, the output pair becomes
N-left, N-right.
• If an output pair has a “left” signal from input N in its “right” channel, the output pair
becomes N-left, N-right.
• If an output pair has no “left” signal at all, the router chooses the input number (N) from its
output’s “left” channel, and the output pair becomes N-left, N-right.
This method has been described as “right follows left.”
 This behavior would be important to engineers only when loss of reference occurs. It has no
bearing on normal operation.
Cabling
Analog Audio Routers
Grass Valley offers a breakout cable for DB25 connectors of analog audio routers. The part
number is WC0053.
Each DB25 connector supports 8 inputs (or outputs):
For 16×16 routers, the connectors provide inputs (or outputs) 1–8, 9–16, 17–24, and 25–32,
respectively, and are labelled that way on the rear of the router. Inputs (and outputs) are treated
as 16 stereo pairs.
For 32×32 routers, the connectors provide inputs (or outputs) 1–8, 9–16, 17–24, 25–32, 33–40,
41–48, 49–56, and 57–64, respectively, and are labelled that way on the rear of the router. Inputs
(and outputs) are treated as 32 stereo pairs.
Number
1
2
3
4
5
6
7
8
Stereo Designation
1L
1R
2L
2R
3L
3R
4L
4R
I/O Connections
(n.c.) 13
No. 2
No. 4
No. 8
No. 6
11
23
10
8
20
7
5
17
4
2
14
1
No. 1
No. 3
No. 7
No. 5
25
12
24
22
9
21
19
6
18
16
3
15
1
14 25
GND
–
+
GND
–
+
GND
–
+
GND
–
+
GND
–
+
GND
–
+
GND
–
+
GND
–
+