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Polycom Vortex EF2280 Manual

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The EF2280 has twelve analog outputs labeled 1-8 and A-D. These outputs are all at line level.
The EF2280 has twelve analog inputs labeled 1-8 and A-D. Inputs 1-8 are mic/line selectable, and inputs A-D are
line level only. Inputs 1-8 can also have phantom power enabled and contain channel processing, which includes
the follwoing DSP algorithms: Acoustic Echo Cancellation, Noise Cancellation, AGC, and Automatic Microphone
Mixing.
Vortex devices can be linked together so that they can share control information and digital audio signals. The
audio signals are shared on four digital busses labeled P, W, X, Y, and Z. All Vortex devices can receive signals
from all of these busses. Only certain devices can transmit on the busses. This information is given in the
following table.
Device Transmit on P Bus Transmit on W, X, Y, Z Busses Receive P Bus Receive W, X, Y, Z Busses
EF2280 No Yes Yes Yes
EF2241 Yes Yes Yes Yes
EF2211 Yes Yes Yes Yes
EF2210 No Yes Yes Yes
EF2201 Yes No Yes Yes
The P bus is meant for routing telephone audio between the devices. The W, X, Y, and Z busses are meant for
routing microphone and auxiliary audio between the devices. The W, X, Y, and Z busses also carry NOM (Number
of Open Microphones) information from the automixer so that outputs created from these busses can be
appropriately attenuated for the number of open microphones.
The digital inputs consist of all of the signals placed on the EF Bus by the other connected Vortex devices. Each
P, W, X, Y, and Z bus can carry channels from up to eight other devices, so we have the following digital inputs
to each Vortex device: PB0-PB7, WB0-WB7, XB0-XB7, YB0-YB7, and ZB0-ZB7. The inputs are designated by
three characters: the bus letter (P, W, X, Y, or Z), a B indicating that it is a bus input, and a number between 0
and 7 indicating the channel of the bus.
There is also an internal signal generator, labeled SG, that is capable of producing white or pink noise. this signal
is fed into the matrix so that it can be routed to the appropriate outputs for calibration or testing.
The mixing capabilities of the Vortex devices can be broken down into two parts: the EF Bus submatrices and the
main matrix.
For each of the W, X, Y, and Z signal busses, there is a 7 x 3 matrix that allows the user to define up to three
mixes of each of the four signal busses. The reason the matrix is 7 x 3 instead of 8 x 3 is that since we can
transmit on the W, X, Y, and Z busses, we do not need to mix our own channels in these matrices. The inputs
and outputs for the 7 x 3 matrices are as follows.
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