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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
PSR1212s (or XAP 800/400s and 16 XAP TH2 units), where the total number of
microphone inputs does not exceed 64. The maximum distance between
interconnected PSR1212 or XAP 800/400 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 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 PSR1212s. 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 Reference buses. These buses allow an input from a PSR1212 to
reference an output on another linked PSR1212 or XAP 400/800. See PA
Adapt and AEC Reference on page 37 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 units. Unlike the audio
buses, they contain only mic status and gate parameters. See page 39 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 PSR1212 supports the full set of commands through the control bus.