Nevion AAV-HD-XMUX - Manual (Page 5)

AAV-HD-XMUX(-T/R)/ AAV-SD-XMUX(-T/R) Rev. G
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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 AAV-HD-XMUX audio core is an AES3 stereo audio router. The received embedded
audio and the audio inputs are the sources in the router. The embedded output groups and
AES3 outputs are the destinations. This feature may also be used to perform stereo channel
swapping.
Four stereo delay lines are also available in the router with a total combined delay of 1.25s.
Audio processing is possible within each stereo output. The channels may be changed
allowing L/R swapping, mono assignment, summing, MS conversion and phase reversal of
one of the signals.
There are two embedding modes:

Non-SRC mode: The AES3 input signals are embedded transparently.

Automatic mode: The module will use sample rate converters when necessary.
Data signals such as Dolby E will always be embedded transparently without using the
sample rate converters.
All embedding and de-embedding is performed with synchronous 48 kHz audio.
The unit may be ordered with optional optical transmitters and receivers. The laser options
range from the standard -7.5dBm 1310nm to the CWDM units. The receivers may be either
HD single mode or HD multi mode. Both units will receive both HD and SD data rates. The
module has signal generators for audio and video for test and line up applications. The
internal 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. The user may also configure the module to mute the outputs if the input
signal disappears.