Polycom Vortex EF2280 Reference Manual

DEFINITION OF TERMS
© Polycom, Inc. 67 VORTEX EF2280 Reference Manual
Room Gain The room gain of a conferencing system refers to the relative levels of the sig-
nal sent to the line output to your amplifier (before any amplification) and the
level of this signal that is reflected at the microphone input (after microphone
amplification). If the electrical level of the reflected signal picked up by the
microphone is the same as the level of the electrical signal sent from the AEC
to the line output to your amplifier, the room gain of this microphone channel
is said to be 0 dB. If the reflected signal picked up by the microphone is
higher than the level of the signal sent to the line output to your amplifier,
that microphone channel has positive room gain. The more positive the room
gain, the harder the AEC must work to determine which signal is an echo and
which is a local speech signal.

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