RACOM M!DGE2, Руководство пользователя

Страница: 135 / 189

Endpoints:
On this page you can activate the endpoints used for voice communication, the following types are
supported:
Voice-Over-Mobile: Endpoint for GSM/UMTS/LTE calls (can be used for calls to mobile or
landline phones)
Nil-Device: A proforma Device to enable Call Signaling without Voice Support
Based on your equipment, we recommend to adjust the modem’s audio profile for a better sound ex-
perience. The following profiles are available:
Handset: Provides a mild echo, short delay (less than 16-ms dispersion). This mode
is intended for use with a well-designed handset, where the Echo Return
Loss (ERL) is generally high. Full-duplex performance is easiest to achieve
in this mode.
Headset: Provides a moderate echo, short delay (less than 16-ms dispersion). This
mode is intended for use in situations where the echo may be loud but low
in delay. There are a variety of different headsets available with a wide variety
of echo characteristics and noise pickup. Although the echo delay is typically
short (< 16 ms) with all headsets, the echo return loss characteristics can
vary significantly and are not well known a priori to the handset designer.
This mode is more robust and more aggressive at echo cancellation.
Speakerphone: Handle situations of loud echo with extreme acoustic distortion. This mode
is intended for use with a car kit or speakerphone applications with high
volume and high distortion. Acoustic echo in this situation has negative ERL
and is impossible to cancel completely. It operates in a half-duplex manner
and will be very aggressive in muting the entire signal to prevent any echo
blips from being heard.
Bluetooth/Carkit: Provides moderate echo, long delay (up to 64-ms dispersion). These modes
are intended for bluetooth headsets and carkits which may have DSP pro-
cessing on board and could give added delay to the system.
Volume level: Specifies the modem’s volume level. 1 = low. 9 = high.
135 © RACOM s.r.o. – M!DGE2 GPRS/UMTS/HSPA+/LTE router
Web Configuration