The ViA POTS G5 module is essentially the same as other G5 POTS modules in Genie and Merlin codecs. It can be used in the codec to stream high quality audio over a POTS (PSTN) phone line. The Tieline Music algorithm can deliver 15 kHz quality bi-directional audio at bit rates as low as 24kbps over a POTS connection.

 

Modem Negotiation and Line Quality

The codec can send and receive high-speed digital information over a standard POTS telephone line via the modem in the ViA POTS module.

 

ViA POTS module modems initially attempt to establish a link at the lowest Maximum Bit rate setting configured in the POTS Module settings. If the POTS line doesn't support a selected 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. The modem then performs a process called ‘training’, during which the codecs at each end of the link analyze the line. The codecs will then 'renegotiate' the link downwards to the highest possible bit rate where line quality is greater than 70%.

 

The ViA POTS module contains a SmartDAA™ (Smart Data Access Arrangement) line interface, which isolates the modem from voltages on phone lines. It is important to select the correct country in the codec from which you are dialing. This allows the SmartDAA to automatically adjust for varying ring tones and line impedances in different countries.

 

Connecting to G3 Codecs using POTS

The codec will successfully connect to Tieline Commander G3 and i-Mix G3 codecs, as well as the Genie and Merlin codec families over POTS. Tieline G3 codecs may use:

 

•POTS modules (older superseded G3 codec version)

•POTS G3 modules (current G3 codec version)

 

Connecting to POTS G3 Modules

POTS G3 modules operate in the same way as all G5 POTS modules (Genie, Merlin and ViA) when connecting, e.g. they establish a link at the default bit rate of 28.8kbps and then 'renegotiate' the link downwards to the highest possible bit rate where line quality is greater than 70%.

 

Connecting to Legacy POTS Modules in G3 Codecs

These modules have slightly different characteristics when connecting. When dialing from a G5 POTS module to these older POTS modules the codecs will attempt to connect initially at 19.2kbps. If line quality is above 80% at this bit rate then the codec will ‘retrain’ the connection up to a maximum of 28,800bps (depending on modem handshaking). The codec will then renegotiate the link downwards to the highest possible bit rate where line quality is greater than 70%.

 

How to Configure ViA POTS G5 Codec Connections

To configure the codec to dial using POTS for the first time:

 

1.Ensure that the correct country setting is configured in your codec via Home screen > > System > Country. This ensures the correct settings are used by the codec when making POTS connections.

2.When dialing between two Tieline codecs use the Dialer to create a POTS dialing program.

 

Other more advanced settings can also be configured:

 

1.Select Home screen > Settings > Transport Interfaces > POTS Module to adjust POTS module settings specific to your codec site.

a.See Configure POTS Module Settings for more information about configuration using the TOUCH SCREEN.

b.See Configuring POTS Modules to adjust settings using the Java Toolbox Web-GUI, or

c.See Configuring POTS Modules to adjust settings using the HTML5 Toolbox Web-GUI.

2.If you are connecting to non-Tieline codecs you may need to create an answering "Config", which determines the settings used when answering a non-Tieline POTS call:

a.To adjust answering configuration using the TOUCH SCREEN select Home screen > Settings > Answering > POTS Answering and see POTS Answering Configuration for more information.

b.See Configuring POTS Answering to adjust settings using the Java Toolbox Web-GUI, or

c.See Configuring POTS Answering to adjust settings using the HTML5 Toolbox Web-GUI.

 

 

Making Analog Phone (Voice) Calls

The ViA POTS G5 module is capable of making analog voice calls. This may be useful to dial a telephone hybrid, or to use for communications, or when there is no Tieline codec at the other end of the link. Remember analog voice calls are only 3 kHz audio quality. To configure analog phone answering mode navigate to Settings > Transport Interfaces > POTS Module > Answer Mode > Analog phone.