Belden Grass Valley NV8900, User Manual

Page: 9 / 41

3
NV8900
Chapter 2 provides a functional description of the NV8900 Series interfaces.
Summary
AES Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Analog Audio Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
The NV8900 product family includes 6 MADI interfaces:
• MADI to AES, unbalanced • AES to MADI, unbalanced
• MADI to AES, balanced • AES to MADI, balanced
• MADI to analog audio • Analog audio to MADI

By AES we mean AES-3 and by MADI we mean “multi-channel audio digital interface,”
governed by standard AES10-2003.
The two analog audio interfaces are quite different from the AES interfaces and are
discussed under
Analog Audio Interfaces on page 5.
AES Interfaces
The two MADI-to-AES interfaces are demultiplexers that have one MADI input and 32 AES
outputs. The unbalanced outputs use 75
W
BNCs; the balanced outputs use 110
W
shielded
twisted pairs on DB25 connectors.
The two AES-to-MADI interfaces are multiplexers that have 32 AES inputs and one MADI
output. The unbalanced inputs use 75
W
BNCs; the balanced inputs use 110
W
shielded
twisted pairs on DB25 connectors.
The MADI inputs and outputs are 75
W
BNCs.
The AES-to-MADI interfaces accept up to 64 audio channels. The MADI-to-AES interfaces
produce 64 audio channels. The individual MADI channels are paired on the AES inputs or
outputs. AES connector 1 corresponds to MADI channels 0 and 1; AES connector 2
corresponds to MADI channels 2 and 3, and so on. AES connector 32 corresponds to MADI
channels 62 and 63.
The AES interfaces are 1RU and about 2
″
in depth. The following photographs are
representative:
This is a front view of the AES (balanced) to MADI interface. The other AES units resemble
this one, where the difference between the models is the legend.