Grass Valley NV7512 v.1.3 - Manual (Page 78)

68 Rev 1.3 • 10 Oct 08
2. Installation
Making Reference Connections
‘REF 1 IN’ and ‘REF 2 IN’ connections are not currently supported. The ‘REF 1 OUT’ and ‘REF 2
OUT’ connections are used as two AES reference outputs. Each MADI channel is supplied with an
AES reference. This signal tells the downstream equipment at what rate the MADI audio is
encoded. Clocks that are synchronous to the encoded audio can be extracted out of the AES refer-
ence. Without this reference, the downstream receiver has no way of knowing if the audio sampling
rate is at 44.1kHz, 48kHz, and so on. There are two reference outputs because the DIP switch selec-
tions allow for up to four channel allocation possibilities. (See
Setting MADI Channels on
page 92.) Three of these possibilities are to output two different MADI channels, therefore there is
an AES output for each.
The MADI reference connections are installed as a separate backplane and require a stable source
of 48kHz AES audio signals. (See
Installing Backplanes on page 41.)
How to make MADI reference connections
1 Locate the MADI reference connections on the MADI inputs backplane on the rear of the
router, as shown in Figure 2-29). Reference connections are located on backplane housing the
MADI signal connections. Inputs are located in the lower half of the router frame. The exact
location of the backplane may differ depending on your configuration.
Figure 2-29. MADI Reference Connection (Rear View)
449-480 417-448 385-416 353-384 321-352 289-320 257-288 225-256 193-224 161-192 129-160 97-128 65-96 33-64 1-32 481-512
I
N
P
U
T
S
O
U
T
P
U
T
S
22
22 22 22 22 22 22 22 22 22
22 22 22 22 22 22 22 22 22 22
QUAD MIX
OUTPUT
ANALOG AUDIO OUT
10/100BT
2
3
4
QUAD MIX
OUTPUT
1
QUAD MIX
OUTPUT
ANALOG AUDIO OUT
10/100BT
2
3
4
QUAD MIX
OUTPUT
1 OUT 1
REF 1 OUT
REF 1 IN
OUT 2
REF 2 OUT
REF 2 IN
OUT 1
REF 1 OUT
REF 1 IN
OUT 2
REF 2 OUT
REF 2 IN
MADI INPUT
IN 1
REF 1
IN 2
REF 2
MADI INPUT
MADI outputs
MADI inputs