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XAP 800 CONNECTIONS •
EXPANSION BUS
52
Expansion Bus Audio Functions
The Expansion Bus network architecture allows up to eight XAP 800s and up to 96
inputs, 96 outputs, and 64 microphones to be controlled as if part of a single unit.
Expansion Bus
This digital mix-minus bus allows audio routing to and from any
destination on the Expansion Bus network. It contains 12 independent digital audio
buses labeled O-Z and four PA Adapt/echo cancellation reference buses. Each audio
bus can route mic or line-level inputs, in any combination, across the Expansion Bus
network. These buses are divided into two groups—O-R buses and S-Z buses— based on
their capabilities and default settings.
O-R Buses These four audio buses are defaulted as the mic mix buses; they can
communicate the NOM count (see page 25) across the network to other XAP 800s.
Otherwise, these buses are identical to buses S-Z.
S-Z Buses These eight buses are defaulted as auxiliary mix buses. They are used to
route auxiliary audio, such as from a CD player, telephone interface, or video codec, to
and from other units on the network. These buses are also used as mic mix buses when
NOM count is not required.
PA Adapt/AEC Reference Buses These buses provide a system-wide bus for input
channels to receive a reference input for PA Adaptive Mode. See page 23 for more
information about PA Adaptive mode.
In addition, there are four global mixer groups (A-D). They support first-mic priority,
maximum number of mics, etc., and work across all linked XAP 800s. Unlike the audio
buses, they contain only mic status and gate parameters. All gated mics are default
routed to the A mixer and to the O bus for routing.
Connecting to the Expansion Bus
Each XAP 800 comes standard with one Expansion Bus cable. The maximum (cable)
distance allowed between any two XAP 800 units on an Expansion Bus network is 80
feet. Gentner Communications recommends that category five twisted-pair (10BaseT
LAN) cable be used.
Summary of Contents for XAP 800
Page 1: ...XAP 800 White Paper ...
Page 67: ......
