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Introduction ~ Networking
7
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Networking
The latency or propagation
delay is <1ms.
✍✍
Expansion bus
The digital mix-minus expansion bus (RJ-45 LAN) is used to connect up to eight
XAP 800/400s and 16 XAP TH2 units, where the total number of microphone inputs
does not exceed 64.The maximum distance between interconnected XAP 800/400 or
PSR1212 units is 80 feet (24 meters). Connecting a XAP TH2 must not increase the
cable length between two PSR1212s, XAP 800s and/or XAP 400s beyond 80 feet.
ClearOne recommends that category five twisted-pair (10BaseT LAN) cable be used.
The expansion bus (E-bus) allows audio routing between destinations on the
E-bus network.The E-bus contains 12 independent digital audio buses labeled O–Z
which can route mic or line level inputs in any combination across the E-bus
network.The O–Z buses are divided into two groups (O–R and S–Z) based on their
capabilities and default settings.The E-bus also contains four PA adapt/acoustic
echo cancellation reference buses, four global gating buses, and one control bus.
• O–R buses. These four audio buses are defaulted as the mic mix buses; they
can communicate the NOM count and mic mixing parameters across the
network to other XAP 800s. All gated mics are routed to the 0 bus by default.
• 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 or VCR, 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/Acoustic Echo Cancellation Reference buses. These buses
allow an input from a XAP 800 to reference an output on another linked
XAP 400/800. See PA Adapt and AEC Reference on page 33 for more
information.
• Global Gating Groups A–D buses. These mix-minus buses are defined as
microphone gating groups which support first-mic priority, maximum number
of mics, etc. and work across all linked XAP 400/800s. Unlike the audio
buses, they contain only mic status and gate parameters. See page 41 for
more information about gating groups.
• Control bus. The control bus is an independent channel from the E-bus’s
audio channel; it uses a different pair of wires on the same E-bus cable.This
allows control information to pass even if the units are not using the audio
link.The XAP 800 supports the full set of commands through the control bus.