Performance

Ping Monitor calculates remote hosts' performance based on their monitoring statistics for specific time periods. The conditions used for calculating the performance are defined on the Performance preferences page Pic 1. You can reach this page by clicking the Preferences button from the Application Menu and selecting the Performance link on the navigation bar on the left in the opened dialog.

You can choose from the following characteristics to be used for calculating the performance:

• Uptime - a percentage ratio of the host uptime to the whole non-pending period of the host;
• Packet Loss - a percentage ratio of the number of lost packets to the number of packets being sent during the specified time period;
• Average Latency - an arithmetic mean of all round-trip times of packets successfully delivered during the specified time period;
• Latency Deviation - a standard deviation from the average latency value for all round-trip times of packets successfully delivered during the specified time period;
• Latency Coefficient of Variation - a percentage ratio of the latency deviation to the average latency calculated for all round-trip times of packets successfully delivered during the specified time period;
• Mean Opinion Score - a well-established metric for obtaining the quality of VoIP based on the latency characteristics and packet loss percentage for all packets sent during the specified time period.

In case any of the Low conditions is met, the performance is considered Low. Next the Medium conditions are checked, and if any is met, the performance is Medium. If no conditions are met, the performance is treated as High. It is possible to disable the performance calculation by unchecking all characteristics.

As for the coefficient of variation (CV), it becomes too sensitive when the average latency is small. It is possible to define the minimum average latency for CV calculation within the Ignore latency of less than field.