Polycom EF2201 Brochure & Specs page 49

Figure 28. A screen capture of the sub-matrix for Vortex EF2280:01 which will feed the main matrix to create the local outputs for Vortex 1:
Zone 2 output and Zone 4. Combination signals WM0 and XM0 contain the microphones from Zone 1 and 3 that need to be sent to the Zone 2
amplifier and combination signals WM2 and XM2 contain the mixes of microphones that need to be sent to the Zone 4 amplifier.
The main matrix for Vortex EF2280:01 is shown in Figure 30. In this figure, we see that the only local outputs
are to the Zone 2 and Zone 4 amplifiers. The EF bus is used to send the microphone audio to the
telephony interface and to send these same microphone zones to EF2280:00 to be played out into Zones 1
and 3. The output for Zone 2 (output 1 on EF2280:01) consists of the codec (from YM0 and ZM0), the
phone add (from PM0), the microphones from Zone 1 attenuated by 9dB (signal WM1 from Figure 28), the
microphones from Zone 4 attenuated by 6dB (attenuated in the main matrix), and the microphones from
Zone 3 attenuated by 9dB (attenuated in the sub-matrix XM1 as shown in Figure 28). The output to Zone 4
(Vortex EF2280:01 Output 2) consists of the codec, the phone add, the microphones from Zone 1
attenuated by 3dB (signal WM2 in Figure 28), the microphones from Zone 2 attenuated by 6dB (attenuated
in the main matrix), the microphones from Zone 3 attenuated by 9dB (attenuated in the sub-matrix XM2 in
Figure 28). NOM attenuation is enabled for outputs 1, 2 so the appropriate output attenuation (based on
the number of open microphones from all the Zones) will be applied.
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