Nevion AV-3G-XMUX - Manual (Page 8)

Introduction 8
AV-3G-XMUX User Manual Rev. B
4 Introduction
The AV-3G-XMUX is a highly integrated audio embedding module in the Flashlink range, offering
simultaneous embedding and de-embedding of eight AES3 stereo digital audio channels from a
digital 3G, HD or SD serial video signal.
The module has two main processing blocks. One processes the video stream and the packet data,
the other processes the audio. The packet processing core forms a group router which can route
embedded audio between groups without any extra delay.
The AV-3G-XMUX audio core is an AES3 audio router. The received embedded audio and the
AES3 inputs are the sources in the router. The embedded output groups and AES3 outputs are
the destinations. This feature may be used to perform stereo channel swapping.
A mono shuffler is integrated into the stereo router. The sources to the shuffler are the same
sources as in the stereo router. The outputs from the shuffler provide four extra stereo sources in
the audio router. Each shuffler output has a configurable delay up to 1.37s.
There are 8 AES ports and each may be used as either an input or an output. The sample rate
converters may be inserted by the module when needed, or the user can disable them. Data signals
such as Dolby E will always be embedded transparently without using the sample rate converters.
All embedding and de-embedding is with synchronous 48 kHz audio.
The unit may be ordered with optical transmitter and receiver options. The laser options range
from the standard -7.5dBm 1310nm to the DWDM units. The receiver may be PIN.
The module has signal generators for audio and video for test and line-up applications. The in-
ternal video generator may be used as a fall-back source that is used if the both the electrical and
the optical input signals fail. This allows uninterrupted transmission of embedded audio.
4.1 Extra 3G functions
AV-3G-XMUX will process the extra 8 audio pairs in 3G SDI.
The module has two different user interfaces in the Gyda System Controller. The ’Large mode’ is
used if the additional audio in the 3G video signals are to be used.
The ’small’ mode represents the module in a similar way to the other Nevion XMUX embedders
and only shows the traditional audio groups 1 to 4. The other 3G audio groups are still transported
through the module.
4.1.1 Large mode
This functionality should be enabled if the user needs access to the audio in groups 5 to 8 in layer
A video OR audio in the second link of Layer B video.
In ’Large mode’ the module can still only embed 4 audio groups: Either the conventional 4 groups
or the four additional groups in 3G video.