The Ef Bus - Polycom Vortex EF2241 Reference Manual

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Figure 15. W, X, Y, and Z submatrices, the P submatrix, and Exported Bus Reference.
V EF2241 Reference Manual
ORTEX
The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z
audio busses, the P bus, as well as the echo canceller bus reference and remote control
information (for other EF devices). It can link up to 8 Vortex devices. The W, X, Y,
and Z busses include NOM information and can be used for sharing microphone
inputs, or for sharing mono or stereo program information.On the EF Bus page in
Conference Composer, the inputs coming in to each submatrix labelled WB0, WB1,
... WB7 correspond with the device ID of the bus that is transmitting. The "B"
denotes Bus. The submixes themselves, denoted as WM0, WM1, and WM2 are
mixes that are input into the main matrix. The "M" denotes Mix.
The P Bus.
The P Bus is provided specifically to allow devices to share digital
phone audio from the EF2241. The EF2241 can both transmit and receive signals on
the P bus, while the EF2280 can only receive signals from the P bus.
Crosspoint Mix Minus Bus.
output mixes (W, X, Y, and Z) and place them on the bus. Each device also can create
three input mixes each from the W, X, Y, and Z busses of the other devices (for a total
of 12 mixes). The mixes can have crosspoint gains on the signals from the other
devices. See Figure 15 below. All 12 mixes become inputs to the main matrix and
can be mixed with the other inputs to create outputs 1-4, A-D, Ref 1, Ref 2, and W, X,
Y, and Z bus outputs.
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Each Vortex device in the system can create four
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