HU-PYXIS
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PYXIS
System User Guide
6.2.2 MADI
MADI
is an industry-standard communications protocol that defines the data format and electrical
characteristics of an interface carrying multiple channels of digital audio. The AES/EBU standard for
MADI is currently documented in AES10-2003. The MADI standard includes a bit-level description
and has features in common with the two-channel format of AES3. Pyxis supports either 56 channels
(28 stereo pairs) or 64 channels (32 stereo pairs) but not both simultaneously, with sampling rates of
up to 48 kHz and resolution of up to 24 bits per channel.
MADI signals are treated as extra Sources and Destinations on the crosspoint, allowing routing
between any AES or analogue audio or MADI channel.
6.2.2.1 Dual
I/O
Each audio rear panel (detailed in section 7.2) provides four MADI connections, two input and two
output.
INPUTS
Input A is always the default.
If Input A fails and B is available the router will automatically switch to Input B.
There is no facility to force Input B; if both are present Input A is always default.
OUTPUTS
Output B is an exact copy of Output A
6.2.3 Audio Modes
Each audio module (AES or Analogue) supports 4 modes (selected using the 4 way DIP switch on each
module, refer to 6.3 and 6.4 for details).
Type
Function
4 Way DIP
Piano Key
DIP
1 OFF
(up)
= 56 channel MADI, ON
(down)
= 64 channel MADI
2 OFF
(up)
= Router mode, ON
(down)
= Transcoder mode
3 OFF
(up)
= lock to reference, ON
(down)
= lock to MADI
4 OFF
(up)
= Fs is not 44.1kHz, ON
(down)
= Fs = 44.1kHz.
Table 25: Audio Mode Switch Settings
1 OFF
(up)
= 56 channel MADI, ON
(down)
= 64 channel MADI
Sets the number of channels carried on the MADI Output. The MADI Input is configured to the same
number as the outputs. In an expanded system within a single frame, all cards must be set the same
(refer to section 6.2.4 and 6.2.5 for details on internal and external expansion)
