Grass Valley NV8900 Series v.1.3 - Manual (Page 16)

8
NV8900
Analog Audio Interfaces
MADI to Analog Audio Interface
This is a front view of the MADI-to-analog-audio interface:
This is a rear view of the MADI-analog-audio interface:
Function
The MADI-to-AA interface accepts one or two MADI input streams. If it receives two MADI
signals, they should be identical. Only one of the MADI streams is active. The other if it is present,
is stand-by. The stand-by input becomes active if the active input fails.
 A failure occurs when the active input has 1 or more bit errors per second for 3 seconds or
more and the stand-by input has no bit errors.
The unit extracts 64 audio channels From the active MADI stream.
The 64 outputs 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.
Alarm LED
Ref. LED
Rotary Switch
Channel LEDs
Power Supply LEDs
MAD I LEDs
Video Reference
(Loop-Through)
Ethernet
Serial Analog Audio Outputs (DB25)
Fan
MADI Output (2)
DIP Switches Power (2)