Name: Polycom Vortex EF2280
Brand: Polycom
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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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