Polycom Vortex EF2211 User Manual

8.15. AMCHNUM -- Set Chairman Mic
This command sets the chairman microphone for the automixer. The first argument of the command
specifies the automixer number (always 1 for the EF2211) . The second argument specifies which
microphone should be the chairman microphone for the automixer (always 1 for the EF2211) . This
command is not particularly useful on the EF2211 and EF2210, however it is provided for consistency
with the EF2280 and EF2241.
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 1 and 1,
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
S01AMCHNUM11
Set microphone 1 as the chairman
mic for the automixer.
S01AMCHNUM11
S01AMCHNUM1?
Query the current chairman mic for
the automixer.
S01AMCHNUM11 , querying the chairman mic
number will always return 1 since there is
only one microphone on the EF2211 .
8.16. AMDECAY -- Set Decay Time for Automixers
This command sets or queries the decay time (in milliseconds) for the automixer.
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 0 and 5000, 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
S01AMDECAY500
Set automixer decay time to 500
ms.
S01AMDECAY500

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