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5.
CARD EDGE CONTROLS
The 7721AE4-HD is equipped with an 8 position DIP switch to allow the user to select various functions.
All positions are assigned sequentially such that the first position is located at the left side of the DIP
switch (farthest from to the card ejector). When the switches are set to Off the LED status indicators near
the DIP switch indicate the presence of the AES audio.
selected, various operation modes of the module can be set using the toggle switch. The LED Mode
indicators near the DIP switch indicate the settings of each of these modes as shown in Table 4-1. The On
position is down, or closest to the printed circuit board. Sections 5.1 to 5.8 show the assigned DIP switch
functions.
1
Off
On
Off
On
Off
On
Off
On
Off
On
Off
---
5.1.
SELECTING THE AUDIO GROUPS THAT WILL BE EMBEDDED
The SMPTE 299M standard permits up to 4 groups of 4 audio channels to be embedded into the 270 Mb/s
video bitstream. Model 7721AE4-HD has two separate embedders that will embed up to four audio
channels (two AES pairs) into one of the groups. The Embedders can be treated as two independent
embedders for unrelated audio content or can be locked together where the audio in both groups is related
and hence its phase must be maintained (for example, 5.1 surround sound audio).
Some legacy equipment may not be compatible with two embedded audio groups
present in the video stream.
7721AE4-(B)-HD HDTV 4 Channel AES Audio Embedder
DIP Switch
2
3
4
5
Off
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
On
Off
Off
Off
Off
On
Off
Off
Off
On
Off
Off
On
On
Off
Off
On
On
Off
Off
Off
Off
On
Off
Off
Off
On
Off
On
Off
On
Off
---
---
---
---
Table 5-1: Toggle Switch Function Overview
Revision 1.5
When other DIP switch combinations are
6
7
8
Description
Off
Off
Off
Audio Present
Off
Off
Off
Audio Delay
Off
Off
Off
Embedder 1 Enable
Off
Off
Off
Embedder 1 Group
Off
Off
Off
Embedder 2 Enable
Off
Off
Off
Embedder 2 Group
HANC Handling
Off
Off
Off
Off
Off
Off
Lock Groups
Sample Rate
Off
Off
Off
Converter Mode
Off
Off
Off
Status LED Mode
Off
Off
Off
Loss of Video Mode
VistaLINK
---
---
On
Remote Control
7700 MultiFrame Manual
Control
Mode
or
®
Page-9
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