Operation Manual

INTEGRATING THE EF2280 INTO YOUR SYSTEM
VORTEX EF2280 Reference Manual 24 Technical Support: 800.932.2774
The EF Bus The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z
audio busses as well as the echo canceller reference and remote control information
(for other EF2280s) and can link up to 8 EF2280 devices. All busses include NOM
information and can be used for sharing microphone inputs, or for sharing mono or
stereo program information.
Crosspoint Mix Minus Bus. Each EF2280 device in the system can create
four output mixes (W, X, Y, and Z) and place them on the bus. Each device also can
create three input mixes each from the W, X, Y, and Z busses of the other devices (for
a total of 12 mixes). The mixes can have crosspoint gains on the signals from the
other devices. See Figure 17 below. All 12 mixes become inputs to the main matrix
and can be mixed with the other inputs to create outputs 1-8, A-D, Ref 1, Ref 2, and
W, X, Y, and Z bus outputs.
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 EF2280s
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 HeadingRu-
nIn(page 31) for more information on how NOM attenuation is applied.
Figure 17. W, X, Y, and Z submatrices.
Submatrix
Bus W
W
B
0W
B
1W
B
2W
B
3W
B
4W
B
5W
B
6W
B
7
Bus X
X
B
0X
B
1X
B
2X
B
3X
B
4X
B
5X
B
6X
B
7
Bus Y
Y
B
0Y
B
1Y
B
2Y
B
3Y
B
4Y
B
5Y
B
6Y
B
7
Bus Z
Z
B
0Z
B
1Z
B
2Z
B
3Z
B
4Z
B
5Z
B
6Z
B
7
Note. The EF Bus must be connected so that the EF BUS OUT of one
EF2280 device is connected to the EF B
US IN of another
EF2280. Connecting EF B
US IN to another EF BUS IN (or EF BUS
O
UT to EF BUS OUT) will not work. See“Connector Pinouts”
on page 48 for pinout of Cat 5 cable.