Polycom Vortex EF2211 User Manual

Even though this is a channel integer command, use of the wildcard character for the automixer
number is not supported.
This command is a channel integer command. See
Section 6.3 and Section 6.2 for more information
on this type of command. The minimum and maximum values for this command are 0 and 20,
respectively.
This command is saved to non-volatile memory only as part of a preset. The state of this command
will be restored after power-up only if a preset is saved and that preset is set to be the power-on
preset.
Example Description Status Message
S01AMREFB16
Set reference bias for automixer 1 to 6
dB.
S01AMREFB16
S01AMREFB1?
Query current reference bias for
automixer 1.
S01AMREFB1x , where x is between 0 and
20 depending on the current setting of the
reference bias for automixer 1.
8.29. AMREFE -- Enable Automixer Reference for Specified
Automixer
This command enables, disables, or queries the automixer referece feature for the specified
automixer. When enabled, the automixer reference feature uses the AEC reference to prevent local
microphones from gating on audio from the remote side. The AMREFE command controls the enabled
status of this feature. The
AMREFB command can be used to bias the AEC reference signal to make
the automixer even less likely to gate on remote audio.
The first argument in the command specifies the automixer number (always 1 on the EF2211) and the
second argument specifies whether automixer reference mode should be enabled, disabled, toggled,
or queried.
Even though this is a channel boolean command, use of the wildcard character for the automixer
number is not supported.
This command is a channel boolean command. See
Section 6.3 and Section 6.1 for more information
on this type of command.
This command is saved to non-volatile memory only as part of a preset. The state of this command
will be restored after power-up only if a preset is saved and that preset is set to be the power-on
preset.
Example Description Status Message
S01AMREFE10
Disable automixer reference mode for
Automixer 1.
S01AMREFE10

Polycom Vortex EF2211 Specifications

Power

input voltage	110-240 VAC
frequency	47-63 Hz
power consumption	25 W
phantom power	24 V

Connectors

RS-232	DB9F
EF Bus In/Out	RJ45
Telephone Line/Set	RJ11
Control/Status	DB25F
Audio	3.5mm quick connect terminal blocks

Audio Specifications

microphone input	-30 dBu to +0 dBu
line inputs	-20 dBu to +0 dBu
line outputs	-20 dBu to +0 dBu
loudspeaker output	10 W, 4-16 Ohms
input impedance	10 k Ohms
output impedance	50 Ohms
headroom	20 dB
signal to noise ratio	85 dB
frequency response	20 Hz - 22 kHz

Echo and Noise Cancellation

total cancellation	65 dB
convergence rate	40 dB/second
noise cancellation	0-15 dB
echo cancellation	40 dB, total >65 dB
convergence	30 dB/second
cancellation span	32 ms
acoustic echo cancellation span	270 ms

Operating Environment

operating temperature	0 °C - 40 °C
status outputs	5 V, 20 mA each

Weight and Dimensions

width	483 mm
length	244 mm
height	45 mm
weight	1.8 kg
shipping weight	2.5 kg