24
Rev 2.3 • 14 Oct 08
2. Introduction
Active Cards
Figure 2-17 shows the synchronous AES signal path.
Figure 2-17. Synchronous AES Signal Flow (Balanced or Unbalanced)
AES Asynchronous
Incoming and outgoing AES asynchronous signals are received or distributed through passive con-
nectors housed on backplanes: 16 BNC connectors for unbalanced signals or 16 Phoenix connec-
tors for balanced signals. (See
on page 13.) Asynchronous AES input signals can be
routed only to asynchronous AES output cards; they cannot be routed to analog or AES synchro-
nous output cards, nor can they be routed as mono channels.
Asynchronous AES operation is not intended for use with “live” or program audio feeds where
glitches at switch boundaries are unacceptable. Instead, asynchronous input cards and output cards
provide an economical way to select AES signal sources, even ones that are synchronous, for ongo-
ing operations such as editing, monitoring or dubbing.
Input Card
The AES asynchronous input card (EM0387) receives up to 16 stereo signals through backplane
I/O connectors. The architecture of the input card is identical to that of the AES synchronous input
card, except that signals are not synchronized to the systems clock on the control card. (See
Output Card
The AES asynchronous output card (EM0388) receives up to 128 stereo inputs from the mother-
board. The signals are then sent to a crosspoint array (128 inputs x 16 outputs) for switching. The
outgoing AES signals are switched asynchronously (i.e., not synchronous with a system clock) and
then sent to balanced output drivers and backplane I/O connectors for distribution. Be aware that
this may cause possible problems in the output signal stream.
Figure 2-18 shows the asynchronous AES signal path.
Figure 2-18. Asynchronous AES Signal Flow (Balanced or Unbalanced)
AES Sample Rate Converter (Input Only)
The AES Sample Rate Converter (SRC) input card (EM0500) provides additional routing flexibil-
ity. The card accepts up to 16 asynchronous AES inputs with a wide range of sample rates. The sig-
nals are converted into synchronous AES signals locked to the 48
I/O
Connectors (up to 16)
Recr
Motherboard
Input Card
Transformer
Coupled
Recr
Output Card
XPT
128x16 stereo
256x32 mono
I/O
Connectors (up to 16)
I/O
Connectors (up to 16)
Recr
Motherboard
Input Card
Transformer
Coupled
Recr
Output Card
XPT
128x16 stereo
I/O
Connectors (up to 16)
Summary of Contents for NV5128
Page 1: ...User s Guide NV5128 Multi Format Router...
Page 44: ...34 Rev 2 3 14 Oct 08 2 Introduction Active Cards...
Page 92: ...82 Rev 2 3 14 Oct 08 6 Maintenance Obtaining Service...
Page 102: ...92 Rev 2 3 14 Oct 08 8 Glossary Glossary...
Page 106: ...96 Rev 2 3 14 Oct 08 A Part Numbers Power Supplies...
Page 114: ...104 Rev 2 3 14 Oct 08 Index...
