Tieline ViA User Manual page 123

ViA User Manual v2.0 123
In Analog Phone mode the Phone input is visible on the Input Audio menu, which is
accessed via Settings > Audio > Inputs .
Tap the Phone input to adjust the level of the phone input and to turn it On or Off.
Other call answering settings are accessible via Settings > Answering > POTS
Answering . Adjustments to these settings are not normally necessary when connecting
between Tieline codecs. Default session and algorithm settings may need to be adjusted when
connecting to non-Tieline codecs over POTS. To configure answering settings in the HTML5
Toolbox Web-GUI see Configuring POTS Modules.
Maximum Bit rate (Affects Dialing and Answering)
Configure connection bit rates from 9.6kbps to 33.6kbps. The default Max Bitrate setting is
28800 (28.8kbps) and this only affects POTS Codec calls. Even if the line supports a higher bit
rate, the Max Bitrate setting is the highest bit rate that will be attempted. Reducing this value
can improve connection reliability on poor quality lines.
ViA POTS G5 modules initially attempt to establish a link at the lowest Max Bit rate setting
configured in the two modules being connected. If the POTS line doesn't support this bit rate,
the modems will attempt to connect at the highest possible bit rate to suit the prevailing line
quality at each end of the link.
In the initial connection phase, the modems perform a process called 'training', to analyze the
line and compensate for frequency and phase response. This also cancels out any echo that
may be present. The codec will then 'renegotiate' the link downwards to the highest possible bit
rate where line quality is greater than 70%. Negotiation is the process of bit rate adjustment.
© Tieline Pty. Ltd. 2017