The Adat To Aes/Ebu Converter General; Inputs - RME Audio ADI-4 DD User Manual

7. The ADAT to AES/EBU Converter
7.1 General
This functional unit is an 8-channel format converter from ADAT to AES/EBU.
Because the Double Wire and Sample Split (S/MUX) formats don't contain a coding, the ADI-4
DD cannot distinguish them from normal (44.1/48 kHz) material. Whether the AES/EBU outputs
are supposed to work in Single (44.1/48 kHz) or Double Speed (88.2/96 kHz) has to be set ex-
plicitly by the user. This happens in the section DS MODE by activating AES.
Complete status displays (Lock, SyncCheck, Level) help to avoid wrong configuration and
wrong clock setup.

7.2 Inputs

The ADI-4 DD provides two digital inputs in ADAT optical format. In normal operation only the
input labelled IN 1 is used. When using more than the first 4 channels at activated DS (Double
Speed), the input IN 2 also has to be used.
The input data is passed on to the four AES/EBU (stereo) outputs in logical order:
ADAT 1
AES/EBU 1L
If the input data is encoded with Sample Split (S/MUX), the AES output has to be set to DS
mode manually. Every input contains the information of only 4 channels, for full 8 channels IN 1
and IN 2 have to be used. 16 input channels 44.1/48 kHz are being converted to 8 output chan-
nels 88.2/96 kHz. The channels are being distributed in the following manner:
ADAT 1/2
IN 1+IN 2 IN 1
AES/EBU 1L
The ADAT optical inputs of the ADI-4 DD are fully compatible with all ADAT optical outputs.
RME's unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch op-
eration, and guarantees a fast and low jitter lock to the digital input signal. A usual TOSLINK
cable is sufficient for connection.
IN 1
Interface for the first or only device sending an ADAT signal to the ADI-4 DD. Carries the chan-
nels 1 to 8. When receiving a Double Speed signal, this input carries the channels 1 to 4.
IN 2
Interface for the second device sending a Double Speed signal to the ADI-4 DD. Carries the
channels 5 to 8.
10
2 3
1R 2L 2R
3/4 5/6 7/8
IN 1 IN 1 IN 1
1R 2L 2R
User's Guide ADI-4 DD © RME
4 5 6
3L 3R
1/2 3/4
IN 2 IN 2
3L 3R
7 8
4L 4R
5/6 7/8
IN 2 IN 2
4L 4R