User's Manual

Avaya Branch Gateway Manager 10.0 Page 185
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
Configuration Settings: System
Measuring Channel Usability
The System Status Application can be used to display voice compression channel usage. Within the Resources section it
displays the number of channel in use. It also displays how often there have been insufficient channels available and the
last time such an event occurred.
These settings should only be adjusted under the guidance of Avaya support.
Usability
· Mergeable: These settings are mergeable. Changes to these settings do not require a reboot of the system.
Configuration Settings
Echo
Echoes are typically generated by impedance mismatches when a signal is converted from one circuit type to another,
most notably from analog to IP. To resolve this issue, an estimated echo signal can be created from one output and then
subtracted from the input to hopefully remove any echo of the output.
· Echo Return Loss (dB): Default = 6dB. IP400 VCM, IP500 VCM, IP500 VCM V2 and IP500 Combination Cards.
This control allows adjustment of expected echo loss that should be used for the echo cancellation process. The options
are 0dB, 3dB, 6dB and 9dB.
Comfort Noise/NLP
A low level of comfort noise is required on digital lines during periods where there would normally be just silence. This is
necessary to reassure users that the call is still connected. These controls allow adjustment of the comfort noise
generated by the nonlinear processor (NLP) component of the VCM.
· Nonlinear Processor Mode: Default = Adaptive. IP400 VCM, IP500 VCM, IP500 VCM V2 and IP500 Combination
Cards.
Allows selection of one of the following options:
· Adaptive
Adaptive means the comfort noise generated by the NLP will try to match background noise.
· Silence
Silence means the NLP will not generate comfort noise at all
· Disabled
Nonlinear processing is not applied, in which case some residual echo may be heard.
· NLP Comfort Noise Attenuation: Default = -9dB. IP500 VCM, IP500 VCM V2 and IP500 Combination Cards.
Options are -3dB, -6dB and -9dB.
· NLP Comfort Noise Ceiling: Default =-30dB. IP500 VCM, IP500 VCM V2 and IP500 Combination Cards.
Options are -30dB and -55dB.
Modem
For Fax relay, these settings allow adjustment of the TDM side operation applied to fax calls using VCM channels.
IP500 VCM, IP500 VCM V2 and IP500 Combination Cards.
· Tx Level (dB): Default = -9dB. Range = 0 to -13dB.
· CD Threshold: Default = -43dB, Options = -26dB, -31dB or -43dB.
· No Activity Timeout (secs): Default = 30 seconds. Range = 10 to 600 seconds.