Grass Valley NV8900 Series v.1.3 - Manual (Page 14)

6
NV8900
Analog Audio Interfaces
Analog Audio to MADI Interface
This is a front view of the analog-audio-to-MADI interface:
This is a rear view of the analog-audio-to-MADI interface:
Function
The AA-to-MADI interface receives 64 analog audio inputs and produces two MADI outputs,
both identical. The second output is for redundancy.
The 64 inputs are paired internally and are represented by 32 LEDs at the front of the panel, one
for each pair. Each of these LEDs acts as a primitive level meter for the pair, according to the
following scale:
LED state Audio Level Range
Off < –50 dBfs
Green –50 to -4 dBfs
Red > –4 dBfs to 0 dBfs
The unit accepts video reference. It derives its internal clocks from the video reference. It can
free-run, but it is advisable to use an external reference, especially when used with an NV8500
hybrid router.
Other LEDs
Each MADI output is represented by an LED at the front of the unit. The LED is green when the
MADI output is good. Otherwise, the LED is off.
The reference signal is represented by an LED. This LED is green when the reference is good and
red when it is not.
An alarm LED is off under normal operation but turns red for the following conditions:
• Overtemperature
• MADI output failure
• Reference is bad or missing
Alarm LED
Ref. LED
Rotary Switch
Channel LEDs
Power Supply LEDs
MADI LEDs
Video Reference
(Loop-Through)
Ethernet
Serial Analog Audio Inputs (DB25)
Fan
MADI Output (2)
DIP Switches Power (2)