Nevion AV-HD-XMUX - Manual (Page 18)

AV-HD-XMUX (-T/R) / AV-SD-XMUX (-T/R) Rev. L
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3.4.4 Limitations
1. There is one thing the user must do in order to receive embedded data. The audio
source where the data is embedded must be routed to a destination in the stereo
router. This is because the extraction of the data takes place on the output of the
router.
Example: Data is to be de-embedded from embedded audio channels 1&2.
Embedded audio channels 1&2 routed to output to Delay 4.
2. The normal UART mode checks the data when receiving and only embeds valid
bytes. The data format must be correct. This also means that a BREAK condition of
many spaces will not be detected or transmitted. Contact support if this is a
requirement.
3.5 Audio Transport mode
This is a special DIP switch controlled mode to set up the module when used to transport
audio from a ‘base frame’ to a ‘remote frame’ and back again. The audio is transported
transparently on groups 1 and 2. This mode is especially useful to transport popular intercom
signals between locations.
3.5.1 In-band management
GYDA control data may also be transported to and from a remote frame with this mode. The
physical connections between the backplane RS485 connector and the frame RS485
communication busses must still be made correctly. This may be done by using the special
backplanes AV-3G-XMUX-CF, AV-3G-XMUX-CM and AV-3G-XMUX-CS or by connecting
customer made cables. Note that the two ends of the connection are different as the module
at the base station end is a ‘sniffer’ while the module in the remote frame is a ‘pseudo
master’. The special backplanes have internal connections that replace the cables.
The AV-3G-XMUX-CF backplane is for use in a remote frame or Flashcase. All AES
connections are on WECO connectors and there are no electrical video connections. Optical
input and output options must be used with this backplane.
The AV-3G-XMUX- CS backplane is used in the ‘base’ frame as a sniffer module to relay
GYDA commands from the controller card into the transmitted signal. It is also used to relay
received data replies from the remote frame onto the internal communication bus.
The AV-3G-XMUX-CM backplane is used in a remote frame. It is used to relay the base
station commands into the remote frame and can embed the responses into output video.
The CM and CS backplanes have the same connectors as the AV-3G-XMUX-C1 except that
the RJ45 data connector is not present.
3.5.2 Setup
The setup for this mode is very simple. All DIP switches must be placed in the on position.
This setting will be re-interpreted by the module firmware with the following settings:

AES inputs to embed on groups 1 & 2

De-embedded groups 1 & 2 to AES outputs

Group 3 disabled.

Data input mode to 115200, no parity, 8 data bits

Data source set to de-embedded audio channel 8

Data destination set to embedded audio channel 8

All Sample rate converters disabled (contact support if SRCs must be enabled)

Audio sine generator signal embedded on all Group 4 audio channels.