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Apollo x8p Hardware Manual Rear Panel 25
Digital I/O
(29) Optical TOSLINK Ports
The optical TOSLINK ports can use either the ADAT or S/PDIF digital protocols for
interconnecting with other audio hardware devices in the digital domain. Two optical
inputs and two optical outputs are provided.
By default, the ADAT protocol is active for all optical ports. The protocol used by the
optical input and output ports can be individually set in the Hardware panel within the
Console Settings window. See the Apollo Software Manual for details.
Each protocol is detailed below.
ADAT S/MUX Optical I/O
When set to ADAT, the optical ports use the ADAT Lightpipe Optical Interface protocol,
routing a total of eight channels of digital audio. The channels routed by the ports
depend on the current system sample rate.
At sample rates of 44.1 kHz and 48 kHz, the original ADAT protocol is used, and eight
audio channels are routed on one ADAT port. At higher sample rates, industry standard
S/MUX is used to maintain high-resolution transfers.
Important: To utilize all eight channels with the optical ports at sample rates
of 88.2 kHz and above, ADAT ports 1 & 2 must both be connected to the other
device, and the other device must also support the ADAT S/MUX protocol.
The following behaviors apply to the ADAT ports:
• At sample rates of 44.1 kHz and 48 kHz, port 1 supports eight channels of I/O.
Output 2 mirrors output 1, and input 2 is disabled.
• At sample rates of 88.2 kHz and 96 kHz, up to four channels of audio are routed
per port (eight channels total, when both ports are used).
• At sample rates of 176.4 kHz and 192 kHz, up to two channels of audio are
routed per port (four channels total, when both ports are used). Only four ADAT
channels are supported at 176.4 kHz and 192 kHz.
The ADAT port channel assignments described above are summarized in this table:
ADAT PORT CHANNEL ROUTING
Sample Rate (kHz) Input Port 1 Input Port 2 Output Port 1 Output Port 2
44.1 & 48 1 – 8 Disabled 1 – 8 1 – 8 (mirror of port 1)
88.2 & 96 1 – 4 5 – 8 1 – 4 5 – 8
176.2 & 192 1 – 2 3 – 4 1 – 2 3 – 4
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