Polycom Vortex EF2211 User Manual

This command sets or queries the status of the line echo canceller (LEC).
This command is a boolean command. See
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
S01LEC1
Enable LEC.
S01LEC1
S01LEC0
Disable LEC.
S01LEC0
S01LEC2
Toggle LEC state.
S01LECx , where x is 0 or 1 depending on the current state of the
LEC.
S01LEC?
Query LEC state.
S01LECx , where x is 0 or 1 depending on the current state of the
LEC.
8.74. LECMODE -- Set Amount of Double Talk Suppression
used in the LEC.
This command sets the amount of double talk suppression used in the LEC on the telephone input (T).
The values correspond to the following settings.
● 1 = No Suppression
● 2 = Light Suppression
● 3 = Heavy Suppression
● 4 = Half Duplex
This command is an integer command. See
Section 6.2 for more information on this type of
command. The minimum and maximum values for this command are 1 and 4, 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
S01LECMODE3
Set LEC to Heavy Suppression.
S01LECMODE3
S01LECMODE?
Query LEC suppression level.
S01LECMODEx where x is 1, 2, 3, or 4 depending on
the current setting of the LEC suppression level.
8.75. LI -- Query State of Logic Inputs
This command returns the current state of the logic inputs. There are 24 logic inputs, so an array of

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