THE EF BUS
VORTEX EF2211/EF2210 Reference Manual 24 Technical Support: 800.932.2774
from the other devices. See Figure 13 below. The input mixes become inputs to the
main matrix and can be mixed with the other inputs to create output mixes.
EF Bus Reference. In a system with multiple devices, if all devices need the
same echo canceller reference, one device should be designated to put its echo cancel-
ler reference on the EF bus to be used as the EF Bus Reference. All other devices
may use the EF bus reference as the reference for their echo cancellers, or they can
use their own internal references. The references may include a mix of any input,
with crosspoint gains, including W, X, Y, and Z busses.
NOM. The W, X, Y, and Z busses on the EF Bus contain NOM information. See
“NOM Active” on page 31 for more information on how NOM attenuation is applied.
4. Configure Your
Echo Canceller
Reference
Review what inputs need to be included in your echo canceller reference — See
“Build Your Echo Canceller Reference” on page 16. Remember that each micro-
phone needs to have an echo canceller reference. If all microphones are in the same
Figure 13. W, X, Y, and Z submatrices, the P submatrix, and Exported Bus Reference.
Note. The EF Bus must be connected so that the EF BUS OUT of one
Vortex device is connected to the EF B
US IN of another Vortex
device. Connecting EF B
US IN to another EF BUS IN (or EF BUS
O
UT to EF BUS OUT) will not work. See“Connector Pinouts”
on page 52 for pinout of Cat 5 cable.
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