Polycom RMX 1500 Administrator's Manual page 32

Chapter 1-Conference Profiles
1-6
• Packet Loss Concealment (PLC) - for Siren audio algorithms
improves received audio when packet loss occurs in the network.
PLC is enabled by the SET_AUDIO_PLC System Flag in system.cfg
— PLC for Audio is supported with MPM+ and MPMx cards only.
— The speaker's endpoint must use a Siren algorithm for audio
compression.
— The following audio algorithms are supported:
• Siren 7 (mono)
• Siren 14 (mono/stereo)
• Siren 22 (mono/stereo)
• Auto Brightness - detects and automatically adjusts the brightness of
video windows that are dimmer than other video windows in the
conference layout.
— Auto Brightness is supported with MPM+ and MPMx cards only.
— Auto Brightness only increases brightness and does not darken
video windows.
• Audio Clarity - improves received audio from participants connected
via low audio bandwidth connections, by stretching the fidelity of the
narrowband telephone connection to improve call clarity.
— Audio Clarity is supported with MPM+ and MPMx cards only.
— Audio Clarity is applied to the following low bandwidth (4kHz)
audio algorithms:
• G.729a
• G.711