RME ADI-4 DD [11/26] Input state display

User's Guide ADI-4 DD © RME

7.3 Input State Display

The input state is being displayed by means of 4 LEDs. Each input has its own SYNC LED.

When SYNC is set to ADAT, a missing or invalid input signal is indicated by slow flashing of the

ADAT LED.

If IN 1 and IN 2 are not synchronous to each other, the corresponding input's SYNC LED will be

quickly flashing. If ADAT is not chosen as clock reference, SyncCheck takes the chosen clock

(WC, AES) as reference and compares it to the clocks of the ADAT inputs. Non-synchronous

inputs will be indicated by quick flashing of the corresponding SYNC LEDs.

The green LED is lit as soon as one of the channels of an 8-channel block contains audio data,

that is no longer digital zero.

7.4 Outputs AES/EBU

The rear side of the ADI-4 DD provides the four AES outputs via a 25 pin D-sub connector. The

output AES 1 is also available directly via a XLR socket, and can be used at the same time as

the D-Sub one. Every output is transformer-balanced, ground-free and compatible to all devices

with AES/EBU port.

If AES STATE PRO (Professional) is chosen, the output level is almost 5V. If CON (Consumer)

is chosen, the output signal will have a channel status compatible to SPDIF. As far as we know,

every SPDIF device should be capable of handling an input signal of up to 5V instead of the

usual 0.5V. Nevertheless the output level will be reduced to 2V when CON is selected.

Connecting devices with coaxial SPDIF ports to the ADI-4 DD is accomplished by simple cable

adapters (XLR/RCA).

To achieve this, pins 2 and 3 of an XLR

plug are being connected to the two

contacts of a phono/RCA plug. The

ground shield of the cable is only con-

nected to pin 1 of the XLR plug.

Besides the audio data, digital signals in SPDIF or AES/EBU format contain a channel status

coding, which is being used for transmitting further information. The output signal coding of the

ADI-4 DD has been implemented according to AES3-1992 Amendment 4.

• 32 kHz, 44.1 kHz, 48 kHz, 64, kHz, 88.2 kHz, 96 kHz according to sample rate

• Audio use

• No Copyright, Copy permitted

• Format Consumer or Professional

• Category General, Generation not indicated

• 2-Channel, No Emphasis or 50/15 µs

• Aux bits Audio use, 24 Bit

• Origin: ADI4

Note that most consumer-orientated equipment (with optical or phono SPDIF inputs) will

only accept signals in ‘Consumer’ format!

The status 'Professional' should always be active when sending data to a device with AES/EBU

input (when XLR connectors are used).