Grass Valley NV8900 Series v.1.3 - Manual (Page 13)

5
NV8900
User’s Guide
Analog Audio Interfaces
The NV8900 analog audio interfaces are larger, and more complex than, the AES interfaces and
provide a number of status LEDs:
The MADI-to-analog-audio interface is a demultiplexer that has two MADI inputs and 64 analog
audio outputs (32 pairs). The outputs use 110
W shielded twisted pairs on DB25 connectors.
The MADI-to-analog-audio interface interprets the incoming framing data and preserve VUCP
data.
The analog-audio-to-MADI interface is a multiplexer that has 64 analog audio inputs (32 pairs)
and two MADI outputs. The inputs use 110
W shielded twisted pairs on DB25 connectors.
The analog-audio-to-MADI interfaces generate VUCP and also generate the framing data (in the
first 4 bits of each MADI subframe).
The MADI inputs and outputs are 75 W BNCs.
The analog-audio-to-MADI interface accepts 64 audio channels. The MADI-to-analog-audio
interface produces 64 audio channels. The MADI channels are paired on the analog inputs or
outputs.
There are 4 analog audio connector pairs on each of 8 DB25s at the rear of the unit, totalling 64
channels (or 32 channel pairs). Each channel corresponds to 3 pins on a DB25; each channel pair
corresponds to 6 pins. The analog channels are numbered consecutively on the 8 DB25s: 1–8, 9–
16, 17–24, and so on, up to 57–64. See
Analog Audio Connectors on page 22.
Each MADI unit has a video reference input (loop-through). Each interface has a serial port (DE9)
that is reserved for future use. Each interface has an Ethernet port (RJ-45) for a connection to
MRC (the Miranda Router Configurator).
Each unit has two power connectors (for PS0001 power supply) and a grounding terminal.
Each unit is 1RU and 17
″ in depth.