Grass Valley NV7512 v.1.3 - Manual (Page 59)

NV7512 Audio Router • User’s Guide 49
2. Installation
Making Signal Connections
8 If connecting two or more NV7512 routers together, connect the signal expansion connections.
(See Signal Expansion Connections on page 53.)
MADI Asynchronous Signals
MADI asynchronous signals can be managed by installing two Sample Rate Converter (SRC) sub-
modules on the MADI input card. For more information, see
MADI Asynchronous Sample Rate
Converter Sub-Module on page 23.
Analog Signals
The NV7512 can route analog signals. Signals are received and distributed through DB25 connec-
tions, housed on backplanes. (See
Backplanes on page 12.)
Each backplane contains four DB25 connectors. Each connector supports either stereo or mono sig-
nals:
• Stereo — 4 channel pairs, for a total of 16 stereo signals per backplane.
• Mono — 8 channels, for a total of 32 mono signals per backplane.
The DB25 connections are labeled ‘1–4 Stereo’, ‘5–8 Stereo’, ‘9–12 Stereo’ and ‘13–16 Stereo’.
The labels correspond to the signal numbers assigned signals passing through that connector (see
Backplanes on page 12).
Analog signals are converted to digital (sample rate of 48kHz) for internal routing. (See Analog on
page 23.) For proper conversion to occur, the system AES reference connection must be connected.
For information on connecting the AES reference, see
AES Reference on page 67.
Mono Signals
How the NV7512 switches mono signals is dependent upon the router control system. Before set-
ting up analog signals, make sure that the router control system can manage mono signals. All sig-
nal number labeling on the router refers to stereo signals, not mono signals. In order to successfully
install and implement cards receiving and distributing mono signals, great care should be taken to
avoid confusion. For more information on mono signals and signal number labeling, see
Analog
Signals and Signal Numbers on page 11.
Gain, Mute Detection and Operating Levels
When receiving and distributing unbalanced analog signals, a drop in level of 6
dB occurs. This is
due to one-half of the input signal being lost when the ‘-’ input is grounded and is normal. Using a
switch located on the analog audio input card, an additional 6
dB of gain can be added to compen-
sate for the drop. In addition, mute detection and operating levels can be set, ensuring a clearer
audio signal. For instructions on setting gain, mute detection and operating levels, see
Setting Ana-
log Gain, Mute Detection and Operating Levels on page 87.