Weed Eater 2600 manual Configuring Echo Adjustment, Configuring Voice Level Adjustment

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Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

Configuring Echo Adjustment

By design, echo cancellers are limited by the total amount of time they wait for the reflected speech to be received, which is known as an echo trail. The echo trail is normally 32 milliseconds. In Cisco System voice implementations, echo cancellers are enabled using the echo-cancel enable command, and echo trails are configured using the echo-cancel coverage command.

To configure parameters related to the echo canceller, use the following commands beginning in voice-port configuration mode:

 

Command

Purpose

Step 1

 

 

Router(config-voiceport)# echo-cancel enable

Enables the cancellation of voice that is sent and

 

 

received on the same interface. Echo cancellation

 

 

coverage must also be configured. The default is

 

 

that echo cancellation is enabled.

Step 2

 

 

Router(config-voiceport)# echo-cancel coverage {8 16

Adjusts the echo canceller by the specified number

 

24 32}

of milliseconds. The default is 16.

Step 3

 

 

Router(config-voiceport)# non-linear

Enables nonlinear processing (residual echo

 

 

suppression) in the echo canceller, which shuts off

 

 

any signal if no near-end speech is detected. Echo

 

 

cancelling must be enabled for this feature. The

 

 

default is that nonlinear processing is enabled.

 

 

 

Configuring Voice Level Adjustment

Use the input gain and output attenuation commands to adjust voice levels, and the impedance command to set the impedance value to match that of the voice circuit to which the voice port connects.

To change parameters related to voice levels, use the following commands as appropriate, in voice-port configuration mode:

 

Command

Purpose

Step 1

 

 

Router(config-voiceport)# input gain value

Specifies, in decibels, the amount of gain to be

 

 

inserted at the receiver side of the interface,

 

 

increasing or decreasing the signal. After an input

 

 

gain setting is changed, the voice call must be

 

 

disconnected and reestablished before the changes

 

 

take effect. The value argument is any integer from

 

 

–6 to 14. The default is 0.

 

 

 

Cisco IOS Release 12.2(2)XT and 12.2(8)T

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Contents Cisco High-Density Analog Voice and Fax Network Module Feature History Release ModificationBase Module Feature OverviewVoice Port Numbers InterfaceFXS and FXO Interfaces Telephony Signaling InterfacesDisconnect Supervision Commands Delay in Voice Networks FXO Supervisory Disconnect Tone CommandsVoice Level Adjustment Echo CancellationAdaptive Jitter Buffering Serviceability Voice Activity Detection CommandsBenefits Cost EffectiveSupported High-Complexity Codecs RestrictionsSupported Medium-Complexity Codecs Supported low-Complexity CodecsSupported Platforms Related DocumentsCisco 2600 series Prerequisites Supported Standards, MIBs, and RFCsConfiguring Analog FXO and FXS Voice Ports Configuration TasksCommand Purpose FXO or FXSDefault is Keyword default is 25 on Cisco 2600 seriesDefault is the pattern specified by the cptone Locale that has been configuredFine-Tuning Analog Voice Ports Configuring Voice Activity Detection VADConfiguring Disconnect Supervision Commands Reversal is enabled Enables battery reversal. The default is that batteryFor FXO ports-Use the no battery-reversal Command to configure a loop-start voice port to notConfiguring FXO Supervisory Disconnect Tone Commands Sec. The default is From 0 to 1000 0 ms to 10 sec. The default isExits voice class configuration mode Voice network module is installedConfiguring Timeouts Commands Timing Commands Configuring Adaptive Jitter Adjustment Voice Quality Tuning CommandsConfiguring Voice Level Adjustment Configuring Echo AdjustmentPlatform Command Syntax Verifying Analog Voice-Port ConfigurationsTroubleshooting Chart, Voice Port Testing Commands, Troubleshooting TipsProblem Suggested Action Troubleshooting ChartReconfigure the voice port Keyword setting also called region tone is USConfiguring Voice Level Adjustment section on Voice Port Testing CommandsLoopback Function Tests Detector-Related Function TestsRelay-Related Function Tests Tone Injection TestsKeyword fax to force the voice port into fax mode Fax/Voice Mode TestsTest. Enter the keyword disable to return Voice port to voice modeAnalog FXO Voice Port Example Configuration ExamplesAnalog FXS Voice Port Example Debug dspapi, Debug hpi, Command ReferenceDebug dspapi Defaults Command Modes Command HistorySyntax Description Release ModificationRelated Commands Description Command Modes Command History DefaultsDebug hpi Usage Guidelines ExamplesTo global configuration mode Global configurationVoice-port Cisco 2600, and Cisco 3600 RouterEncapsulation Dial-peer voiceGlossary
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