THE EF BUS
© Polycom, Inc. 23 VORTEX EF2211/EF2210 Reference Manual
T
HE
EF B
US
The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z
audio busses, the P bus, as well as the echo canceller bus reference and remote control
information (for other EF devices). It can link up to 8 Vortex devices.
The W, X, Y, Z Busses. The W, X, Y, and Z busses include NOM informa-
tion and can be used for sharing microphone inputs, or for sharing mono or stereo
program information. On the EF Bus page in Conference Composer, the inputs com-
ing in to each submatrix labelled WB0, WB1, ... WB7 correspond with the device ID
of the bus that is transmitting. The “B” denotes Bus. The submixes themselves,
denoted as WM0, WM1, and WM2 are mixes that are input into the main matrix. The
“M” denotes Mix.
The EF2211 and EF2210 can transmit and receive signals on the W, X, Y, and Z bus-
ses.
The P Bus. The P Bus is provided specifically to allow devices to share digital
phone audio from the phone hybrid devices (EF2241, EF2201, EF2211).
On the EF Bus page in Conference Composer, the inputs coming in to each submatrix
labelled PB0, PB1, ... PB7 correspond with the device ID of the bus that is transmit-
ting. The “B” denotes Bus. The submixes themselves, denoted as PM0, PM1, and
PM2 are mixes that are input into the main matrix. The “M” denotes Mix.
The EF2211 can both transmit and receive signals on the P bus. The EF2210 cannot
transmit but can receive signals on the P bus.
Crosspoint Mix Minus Bus. Each Vortex device in the system can create
up to 5 output mixes, depending on what signals they can transmit, and place them on
the bus. Each device also can create three input mixes from each of the input busses
of the other devices. The mixes allow crosspoint gains to be adjusted on the signals
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