The packet loss rate (PLR) indicates the percentage of lost data packets on a transmission link. The packet loss rate is the ratio of the number of packet losses to the total number of transmitted data packets.
The packet loss rate is one of the decisive factors for the voice quality of packet-switched voice, as used in Internet telephony (VoIP), Voice over LAN (VoLAN) or VoWLAN. It plays the decisive role in the evaluation of speech quality according to Perceptual Evaluation of Speech Quality (PESQ) or Multimedia Perception Assessment Center (MPAC) and is specified by ITU-T in Recommendation G. 114. In addition, the packet loss rate is specified in the ITU-T QoS classes.Internet can rise to as much as 20%, resulting in a massive impairment of the transmission.