I64 Madi Card - RME Audio ADI-8 QS User Manual

12.3 I64 MADI Card

The I64 MADI Card provides the ADI-8 QS with a 64-channel MADI input and output. Coaxial
and optical output operate simultaneously and deliver the same data. The ID determines which
MADI channels the ADI-8 QS will use (see chapter 9.5, ID). The MADI outputs operate in paral-
lel to the AES/EBU and ADAT outputs, provide the same audio data, and are configured with
the same front panel controls.
The I64 MADI Card features an optical as well as a coaxial MADI input. The input is switched
automatically, according to where a valid input signal is detected. Full redundancy is ensured by
the automatic input switching, immediately changing to the other input in case of loss of the
input signal.
The MADI input will operate as an optional clock source (Clock section, OPTN) as well as a
through input. Since each ADI-8 QS uses only 8 channels, up to 56 channels can be passed
through.
This technique is used to serially cascade several ADI-8 QS. Incoming MADI data is passed
through unchanged, only one block of eight channels is replaced, according to the ADI-8 QS'
ID. This allows up to 8 devices to be connected serially. All 64 combined channels are available
at the last device's output. The ID determining the block of eight channels used by an individual
device is determined automatically (Auto ID) or manually in the setup menu (ID):
ID 01: Channels 1-8
ID 04: Channels 25-32
ID 07: Channels 49-56
The I64 MADI Card defaults to the 56-channel format at its outputs. As soon as a 64-channel
format is detected at the inputs, or the ID 08 is used, the output switches to 64-channel format.
Note: The 96k frame mode is activated at the outputs automatically when the MADI input signal
is 96k frame. A manual selection of the output format, and with this a converter functionality
48k/96k, is not available.
With an installed I64 MADI Card the ADI-8 QS can be remote controlled via MADI. At the same
time MIDI data are transmitted via MADI, see chapter 10.3.
When multiple devices are connected serially, the MADI I/O of each ADI-8 QS causes a delay
of 3 samples. Therefore at the MADI output of the last device, the data of all previous devices
are delayed. At Double Speed the delay rises to 6 samples per unit, at Quad Speed to 12 sam-
ples.
The problem of this offset is solved by the function Delay Compensation, see chapter 9.8. It
delays the signals in a way that they are sample-synchronous in multi-device operation. The
diagram on the next page shows a serial setup with HDSP MADI card, three ADI-8 QS and
activated Delay Compensation.
Delay Compensation has to be manually activated in each unit!
32
ID 02: Channels 9-16
ID 05: Channels 33-40
ID 08: Channels 57-64
User's Guide ADI-8 QS © RME
ID 03: Channels 17-24
ID 06: Channels 41-48