Nevion AES-VMUX - Manual (Page 8)

Introduction 8
AES-VMUX/-SFP User Manual Rev. G
4 Introduction
The AES-VMUX is used to transport a large number of digital audio signals. The module is both
a multiplexer and demultiplexer and has 16 AES audio ports which may be used as inputs or
outputs. The module forms the core of a highly flexible audio transport and routing concept.
The audio transport has a fixed embedding and de-embedding delay of 64us. The audio signals
are transported completely asynchronously and bit transparently. The clock and phase informa-
tion of each AES signal is transported along with the data and the signal is re-constructed at the
demultiplexer end. This keeps all of the AES signals time-aligned through the multiplex and pre-
serves the signal phase alignment of multichannel audio.
The module encodes the audio into an SD SDTI video signal and uses the active video space in the
video frame. This allows routing and transport of the multiplex through an established broadcast
infrastructure and inspection with standard test equipment/ waveform viewers.
Modules may be daisy chained to increase the number of AES audio signals in the SDTI signal up
to a maximum of 64 AES channels.
Demultiplexing may be performed on any module from any of the audio signals in the SDTI mul-
tiplex. Each demultiplex channel is, in effect, a 64 to 1 AES router.
The module may also be equipped with an SFP providing optical link capability.
Six backplane types are presently available:-
• Double width backplanes
− AES-MUX-C1; All 16 AES ports on female d-sub DB25 and dual optical connectors.
− AES-VMUX-C5; As AES-MUX-C1 but with passive relay loop-through on electrical
SDTI.
• Single width backplanes
− AES-VMUX-C1; 8 AES ports on DB25, DIN 1.0/2.3 SDTI and dual optical connectors.
− AES-VMUX-C4; 8 AES ports on DB25, BNC SDTI and single optical connector.
• Flashcase single width backplanes
− AES-VMUX-C2; 16 AES ports on Molex Male KK, BNC SDTI output only and dual
optical connectors.
− AES-VMUX-C3; 16 AES ports on Molex Male KK, BNC SDTI and single optical con-
nector.
SFPs are available for:-
• APD/CWDM Transceiver (18 wavelengths)