A congested connection usually shows an efficiency problem. This may prevent the connection from reaching its full bandwidth. If other applications are using the internet it is advisable to pause them and re-run the test. If the test is running late at night or in the early morning and you get a worse result during prime hours (8am-8pm) then the issues should be raised with your provider.

A good connection has an efficiency of 90% or above. Inefficient connections should be tested outside prime usage, such as early morning or late night to see if the situation improves. If it does then it is a good indication of congestion problems.

Round Trip Time (RTT) consistency is singularly one of the most important measures of a connection. The RTT time defines the time it takes for a packet to travel to the destination and back. Consider a daily commute to a your place of work. If the trip to work varies in time each day what does it tell you about the road? If the trip time variance is very erratic then quality problems such as retransmissions will occur. The longer the trip time the slower the data throughput.

Max delay is the amount of time spent idle waiting for data to arrive from the other end of the connection being tested. A high (greater than 100ms) max delay is an indication of a significant quality problem.

Packet quality problems will cause a bad user experience. If you have not passed this test, this should be reported to your network provider.

Packets can arrive out of order. This can cause retransmissions of packets and duplicate packets, which can cause wasted bandwidth. If retransmissions or duplicates are being reported then this should be raised with your ISP as a priority.

Jitter is a common problem of the connectionless networks or packet switched networks. Because the information (voice packets) is divided into packets, each packet can travel by a different path from the sender to the receiver.

Packet Loss can occur for a variety of reasons including high levels of congestion. Packet Loss causes degradation in voice quality. Packet Loss typically occurs in bursts of 20-30% loss lasting 1-3 seconds. This may mean that the average packet loss rate for a call appears low although the user reports call quality problems.

MOS measures subjective call quality for a call. MOS scores range from 1 for unacceptable to 5 for excellent.