214 CHAPTER 3: D EVICE CONFIGURATIONModifying T1 Audio ControlsAudio Controls settings affect individual spans. You can edit theseproperties:■ Silence Suppression (3C10126D only) — Enables you to override thesystem-wide setting. For a detailed description of how silencesuppression affects audio quality and bandwidth, see “AudioSettings” on page 257.■ Audio Compression (3C10116D only) — Enables you to override thesystem-wide setting. For a detailed description of how audiocompression affects audio quality and bandwidth, see “AudioSettings” on page 257.■ Audio Source Gain — Enables you to adjust the audio gain to resolvevolume issues.CAUTION: Do not change your Audio Source Gain settings unless youare instructed to do so by a support representative.To modify T1 Audio Controls:1 On the Digital Line Cards tab, select T1 Span List or ISDN PRI Span Listfrom the Select Device Type list.2 Click Apply.3 Select the span you want to modify from the Span List. The number ofchannels supported per span depends on the configuration of the DigitalLine Card.4 Click Audio Controls. Click the Help button for more information aboutdialog box fields.In a normal environment, you should not need to change the AudioControls from their default settings. If you have an issue with soundquality and you cannot resolve it using the volume controls on the NBXTelephones, contact your technical support representative.Modifying a T1 Group A Digital Line Card group is one or more T1 channels that are assignedthe same characteristics, such as Channel Protocol and DS1 direction. Thissection describes how to perform these actions:■ Modifying a T1 Group■ Changing T1 Group Membership■ Removing a T1 Group
