Polycom Vortex EF2280 Reference Manual

CONNECTOR PINOUTS
VORTEX EF2280 Reference Manual 60 Technical Support: 800.765.9266
C ONNECTING U NBALANCED RCA TO B ALANCED T ERMINAL B LOCK
1. Connect RCA Tip to terminal block pin 1.
2. Connect RCA Ring to terminal block pin 2.
3. Connect terminal block pin 3 to Shield, and leave Shield floating on RCA
end.
M AKING AN EF B US T ERMINATOR
Instructions To make a terminator (for use when connecting legacy EF2280s with inline audio
connections), use an RJ45 connector. Connect pin 3 to pin 6 with an 110 Ohm resistor.
A terminator is not required for the EF2280’s with stacked audio connections as the
terminator is built-in.
Figure 31. Cable construction for connecting unbalanced RCA to balanced 3 conductor terminal block.
Red
Black
Red
Black
Shield
Tip
Ring
RCA Male
3.5 mm Terminal Block
Connector
2
1
3
+
-
Caution! Do NOT connect the shield at both ends.
Caution! On the EF2280, terminal block pin 3 is connected to
chassis ground. Under no circumstances should pin 3
be connected to pin 1 or to pin 2. Doing so will add
noise to the audio signal.
Figure 32. The EF Bus terminator
12345678
110 Ω

Polycom Vortex EF2280 Specifications

General

Rack capacity	1U
Frequency range	20 - 20000 Hz
Cancellation span	270 ms
Echo cancellation	65 dB
Phantom power	48 V
Nominal input level	0 dB
Output gain	-100 - 20 dB
Output impedance	33 Ω
Maximum output amplitude	23 dB
RS-232 ports	1
Audio connections	2 x 3.5mm
Parallel ports quantity	2
Input voltage	110 - 240 V
Output current	20 mA
Output voltage	5 V
Input frequency	47/63 Hz
Power consumption (typical)	30 W
Operating temperature (T-T)	0 - 40 °C

Weight and Dimensions

Weight	1800 g
Dimensions (WxDxH)	483 x 244 x 45 mm