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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Introduction ~ Networking
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.