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11. Digital Outputs
11.1 AES/EBU
The four AES/EBU outputs are provided on the rear of the OctaMic II via a 25 pin D-sub con-
nector with Tascam pinout (also used by Digidesign). A digital breakout cable will provide 4
male (and 4 female) XLR connectors. Every output is transformer-balanced, ground-free and
compatible to all devices with AES/EBU ports.
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
OctaMic II has been implemented according to AES3-1992 Amendment 4:
• 32* / 44.1 / 48 / 64* / 88.2 / 96 / 176.4 / 192 kHz according to the current sample rate
• Audio use
• No Copyright, Copy permitted
• Format Professional
• Category General, Generation not indicated
• 2-Channel, No Emphasis
• Aux bits audio use, 24 bit
• Origin: 8MIC
* This status is set automatically in external synchronization mode as soon as the sample rate is
recognized.
The format is set by DIP switch 6 to Professional or Consumer. If AES PRO is chosen, the out-
put level is almost 5V. If CON (Consumer) is chosen, the output signal will have a channel
status compatible to SPDIF, and the output level will be reduced to 2V.
Connecting devices with coaxial SPDIF
ports to the OctaMic II's outputs is accom-
plished
by
simple
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 connected to pin 1
of the XLR plug.
Note that most consumer HiFi equipment with phono SPDIF inputs will only accept signals
with Channel Status 'Consumer'.
The OctaMic II supports Single Wire only, in the range of 32 kHz up to 192 kHz: a total of 8
channels, 2 channels per AES wire. The effective sample frequency equals the clock on the
AES wire. In case a conversion from/to Single, Double and Quad Wire is required, the RME
ADI-192 DD, an 8-channel universal sample rate and format converter, is highly recommended.
Pinout of the D-sub connector, Outputs
Signal
Out
Out
1/2+
1/2-
D-Sub
18
6
GND is connected to pins 2, 5, 8, 11, 16, 19, 22, 25. Pin 13 is not connected.
18
cable
adapters
Out
Out
Out
3/4+
3/4-
5/6+
4
17
15
User's Guide OctaMic II © RME
Out
Out
Out
5/6-
7/8+
7/8-
3
1
14
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