RME ADI-648 [22/32] Madinet
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RME ADI-648 [22/32] Madinet

RME ADI-648 [22/32] Madinet
22
User's Guide ADI-648 © RME
Example 1: A mixing desk sends 48 channels via MADI. 16 more channels from two RME Oc-
taMic-D (8-channel microphone preamps with ADAT output) shall be recorded by a HDSP
MADI into a computer. This application requires only one ADI-648, which has to be inserted into
the MADI line. The Routing Matrix is used to loop channels 1 to 48 from MADI input to MADI
output (groups 1 to 6). The two OctaMic-D will be connected to the ADAT inputs 7 and 8, which
not only guarantee best overview, but also automatically activate the 64-channel mode. The
Routing Matrix is now set up to send the ADAT input channels 49 to 64 (group 7 and 8) to
channels 49 to 64 (group 7 and 8) of the MADI output. Now the ADI-648's MADI output signal
includes both the original MADI input channels 1 to 48, and the audio signals of both OctaMics
(on channels 49 to 64).
Example 2: The signals of two MADI devices shall be united to a single MADI stream. This can
be handy, because it requires only one MADI cable for transmission. It can also be a require-
ment, because the receiving device may have only one input…
The number of ADI-648s necessary is identical to the number of MADI signal sources, so it's
two for this example. The first ADI-648 serves as MADI to ADAT converter. Its ADAT outputs
are connected with the ADAT inputs of the second ADI-648. The second ADI-648 is used as
described in example 1, sending the MADI input signal directly to the MADI output. At the same
time, the unit fills the unused MADI channels at its MADI output with the audio signals from the
ADAT inputs.
The block diagram
shows cabling and
signal flow of such
an application.
At the bottom, the
setting of the sec-
ond unit's Matrix
Router is shown.
11.5 MADInet
MADI is much more flexible and powerful as commonly known. To better make clear what MADI
really is – a kind of audio network – we introduced the term MADInet. The main point to know is
that the MADI input signal is completely rebuild before it is sent to the MADI output. A clock with
active jitter suppression (like SteadyClock) provided, numerous ADI-648 can be daisy chained.
The input signal can be passed on in different ways using the matrix router. And when build as
ring loop, audio can even be sent back from all ADI-648 to the first device. The specified length
of BNC cable connections is multiplied by the number of used ADI-648, as each device resends
the MADI signal as a newly generated original.
A real world example: Imagine a theme park, where different audio is needed at 20 places far
away from each other. The audio material is send from a computer, playing back 20 different
stereo tracks via a HDSP MADI. The card is connected via BNC to the first ADI-648. This one
(like all others) is set up to pass all incoming audio 1:1 to its MADI output, so that the audio is
sent directly to the next ADI-648. At the same time the audio is available at each unit using the
ADAT optical outputs. The distance between the units is more than 50 meters. The last ADI-648
is connected with the HDSP MADI again, as each ADI-648 can also be used to insert signals
into the loop (for example surveillance microphones). MIDI transmission included.

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