BUILDING YOUR SYSTEM WITH MULTIPLE VOR-
be mixed with the other inputs to create Outputs
Submatrix
Bus W 
WB0 
WB1 
WB2 
WB3 
WB4 
WB5 
WB6 
WB7 
Bus X 
XB0 
XB1 
XB2 
XB3 
XB4 
XB5 
XB6 
XB7 
Bus Y
YB0 
YB1 
YB2 
YB3 
YB4 
YB5 
YB6 
YB7 
Bus Z 
ZB0 
ZB1 
ZB2 
ZB3 
ZB4 
ZB5 
ZB6 
ZB7 
Figure 1. W, X, Y, and Z submatrices.
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 (either Ref 1 or Ref 2) on the EF bus to be used as the EF Bus Reference.
All other Vortexes may use the EF bus reference as the reference for their echo can- cellers, 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 Bus. All busses on the EF Bus contain NOM information. See “NOM Active” on page 29 of the Vortex Reference Manual for more information on how NOM attenuation is applied.
Note. The EF Bus must be connected so that the EF BUS OUT of one Vortex device is connected to the EF BUS IN of another Vortex. Connecting EF BUS IN to another EF BUS IN (or EF BUS OUT to EF BUS OUT) will not work. See“Connector Pinouts” on page 43 for pinout of Cat 5 cable.
4.CONFIGURE YOUR ECHO CANCELLER REFERENCE
Review what inputs need to be included in your echo canceller reference — See “Build Your Echo Canceller Reference (if not using Preset 0)” on page 13. of the Vor- tex Reference Manual. Remember that each microphone needs an echo canceller ref- erence. If all microphones are in the same room and use the same reference, configure the echo canceller reference on one Vortex and assign it to the EF Bus as the EF Bus Reference. Only one Vortex out of multiple units linked together can put
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