ClearOne AP400 - Manual (Page 11)

7 Introduction ~ G-Link Networking
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X-bus
This mix-minus bus is defined as the master microphone mix, and it supports NOM
(see page 26). All gated microphones are default routed to this bus.
Y-bus
This mix-minus bus is defined as the line input master mix. All line-level audio inputs
such as video codecs, AP800s, AP10 Telephone Interfaces, VCRs, etc., are default
routed to this bus. Y-bus does not support NOM.
Z-bus
This mix-minus bus is a user-defined auxiliary mix bus. Z-bus does not support
NOM.
G-Link EC Reference bus
This bus provides a system-wide echo canceller reference signal. It allows the
reference signal to be passed to additional G-Linked mic channels and their
associated echo cancellers. Typically, one output on one unit will be passed along the
G-Link EC Reference bus.
Control bus
The control bus is an independent channel from the G-Link’s audio channel; it uses a
different pair of wires on the same cable. This allows control information to pass
even if the units are not using the audio link. The AP400 supports the full set of
commands through the control bus.