Operation
6
SMUX operation
Internally the A32 always uses all 32 analog channels, but the number
of digital MADI and ADAT channels is limited in relation to the SMUX
mode currently in use.
SMUX/1
SMUX/1 offers frequencies from 32kHz up to 48kHz.
SMUX/2
When using higher frequencies (64kHz to 96kHz) SMUX/2 is used. This
means that a single channel of audio is split across two consecutive
channels of the digital stream when transmitted via ADAT or MADI
(signal multiplexing). Consequently, the number of ADAT or MADI
channels is halved. For example, when using a sample rate of 96kHz
there will be 32 channels available via MADI as opposed to the usual
64 channels at 48kHz and below. Likewise, at 96kHz each ADAT cable
will carry 4 channels as opposed to 8 at 48kHz and below.
SMUX/1 and SMUX/2 offer redundant MADI. This means, that when
the MADI signal is lost, the A32 automatically switches to the other
MADI input.
SMUX/4
The SMUX/4 operation (128kHz-192kHz) divides the information of
each channel across four channels. This reduces the bandwidth of the
digital channels by a factor of 4. ADAT is not supported at that speed
and is switched off. The MADI cable only offers 16 channels at
SMUX/4. In order to still be capable of transferring all 32 analog
channels a special SMUX/4 mode will be activated. This mode uses
both MADI coax and optical connections simultaneously to transfer all
32 channels:
optical MADI: transmits and receives analog channels 1-16
coax MADI: transmits and receives analog channels 17-32
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