MT 48 | 9
Adding I/O via ADAT / S/PDIF and AES67
The MT 48 oers two ways for adding more I/O channels:
ADAT
• ADAT is an established standard used predominantly in project studios. ADAT allows for up
to 8 channels via optical connectors at sampling rates up to 48 kHz. At higher sampling rates
the channel count reduces to 4 channels at double sampling rates up to 96 kHz and 2 chan-
nels at quad rates up to 192 kHz.
• Alternatively, the optical I/O can be used in S/PDIF mode, allowing for 2 channels at all
sampling rates up to 96 kHz.
AES67
• AES67 is an open standard for audio-over-IP networks which ensures interoperability
between various audio network protocols such as DANTE, RAVENNA. AES67 was developed
by the Audio Engineering Society (AES) and has been embraced by the broadcast market
but is gaining more traction in recording environments as well. AES67 uses ethernet con-
nections and can handle high channel counts even at high sampling rates. The AES67 port
on the MT 48 is bidirectional, it can send and receive audio data simultaneously. Using a
standard ethernet switch you could connect a Neumann AES67 loudspeaker and Merging
converters at the same time. Note: The MT 48 supports the RAVENNA protocol, which is fully
compliant with AES67 and SMPTE ST 2110.
• Peering is a particularly convenient form of AES67/RAVENNA. Currently this only works with
devices by Merging Technologies (who are now part of Neumann), such as Hapi, Horus, and
Anubis. These high-end converters can be seamlessly integrated via Peering for I/O expan-
sion and remote controlling their preamps and other functions from the MT 48.
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