R-Value Listening, R-Value Conversational, MOS Listening, and MOS Conversational values are computed using the packet loss, jitter and delay information. These values are intended to give a quantitative assessment of the call quality. The VoIP MOS screen is designed to provide you the ability to place and receive calls, and measure these values.

Once the meter has successfully ranged and registered with the CMTS, the View Data menu item is available on the View menu.

NOTE:

- VoIP test can only be initiated after the meter has successfully registered with the CMTS, and the MTAs has successfully initialized.
- VoIP mode cannot be initiated if Ranging Only is configured.
- A call cannot be placed or received if registration with the CMTS has failed.

Results for the current, maximum, and average R-Value Listening, R-Value Conversational, MOS Listening, and MOS Conversational are displayed on the screen once a call is placed or received. You can save test results for archival purposes and use the existing VoIP file to compare previously collected data. Details of each parameter is provided as follows:

R-Value Listening

The R-Value Listening number represents a quantitative measurement value based solely on the local packet loss, jitter and delay measurements. The value range for R-Value is 0 to 93.

R-Value Conversational

The R-Value Conversational number represents a quantitative measurement value based on both the local and remote values for packet loss, jitter and delay. The value range for R-Value is 0 to 93

MOS Listening

The Mean Opinion Score (MOS) Listening value is a conversion of the Listening R-Value based on the ITU G.107 conversion formula. The Mean Opinion Score (MOS) for listening represents a quantitative value base solely on the local packet loss, jitter and delay measurements. The value range for MOS is 0.0 to 5.0.

MOS Conversational

The Mean Opinion Score (MOS) Conversational value is a conversion of the Conversational R-Value based on the ITU G.107 conversion formula. The MOS Conversational value represents a quantitative value of the whole call and takes into account the packet loss, jitter and delay measurements for both the local endpoint and the remote endpoint. The value range for MOS is 0.0 to 5.0.