RME ADI-648 [9/32] Operating the adi 648

User's Guide ADI-648 © RME

5.3 Operating the ADI-648

Join us for a small 'tour de ADI', starting on the left side at the MADI to ADAT Converter. Con-

figuration starts with choosing the input, BNC or optical. The state of the input signal is dis-

played by 14 LEDs. Shown are active input, automatic input selection, receiver state, Sync, 56

or 64 channel format, 48k Frame or 96k Frame, and audio data within 8-channel groups. The

Sync LED shows the synchronicity between input signal and external/internal clock, or between

the active inputs.

The ADAT to MADI

Converter shows the

Sync state for each of

the 8 inputs via 8

LEDs. Again 8 LEDs

display incoming

audio data per 8-

channel group.

By using the 96k FRAME key, the MADI output is switched into Double Speed mode. This mode

is active when the '96k Frame' LED is lit. In case the WCK LED is lit, the word clock output no

longer provides 44.1/48 kHz, but 88.2/96 kHz. However many devices operate in Single Speed

only, and distribute – as known from Double Wire – 96 kHz data on two channels. In this case

the ADI-648 operates correctly even without changing to 96k Frame mode, because Double

Wire will be converted 1:1 to ADAT (S/MUX).

RME's intelligent clock control (ICC) offers extensive and professional means. To start with, the

clock source can be set to Internal (crystal), External (BNC word clock) and Input, while Input

lets you select between ADAT and MADI. The INT(ernal) clock rates are 44.1 and 48kHz. Lock

state is displayed by the state of the input LEDs (flashing or constantly lit).

The ADI-648 can be remote controlled by MIDI commands. The key REMOTE is used to select

the source of the MIDI commands, and also the destination for the ADI-648's request replies.

The normal MIDI ports or the MADI input and output can be chosen. The current REMOTE se-

lection does not have any influence on the basic conversion of MIDI to MADI and vice versa.

Normally all 64 MADI channels will be routed to the according ADAT outputs, and all ADAT

inputs to the 64-channel MADI output (optical and coaxial output operate in parallel).

The 16 x 16 Matrix Router can be activated via the STATE key, and allows to change this rout-

ing. First choose an output by pressing the Output Select key, then use the Input Select key to

select the desired input. An input can be assigned to as many outputs as present (splitting), but

an output can not be assigned to more than one input (digital mixing). Routing within the same

format is also allowed. This way ADAT inputs can be routed directly to ADAT outputs, without

the need of a MADI loopback cabling. So all attached devices can send signals to each other

without the need to rearrange the cabling between them.

When stepping through all inputs: the input is muted when no LED is lit. To reset the Matrix

Router to the factory default (routing as if de-activated), press the INPUT and OUTPUT

SELECT keys at the same time.