Evolution of Signaling Information Transmission

Table 1

ITU-T QoS classes [6].

QoS^f class	Application (examples)	IPTD^e	IPDV^b	IPLR^d	IPER^c
Class 0	Real-time, jitter sensitive, high interaction (VoIP^g, VTC^h)	100 ms	50 ms	1 × 10^−3	1 × 10^−4
Class 1	Real-time, jitter sensitive, interactive (VoIP^g, VTC^h)	400 ms	50 ms	1 × 10^−3	1 × 10^−4
Class 2	Transaction data, highly interactive (signaling)	100 ms	U^i	1 × 10^−3	1 × 10^−4
Class 3	Transaction data, interactive	400 ms	U^i	1 × 10^−3	1 × 10^−4
Class 4	Low loss only (short transactions, bulk data, video streaming)	1 s	U^i	1 × 10^−3	1 × 10^−4
Class 6	Traditional applications of default IP^a networks	U^i	U^i	U^i	U^i

^aIP: Internet Protocol; ^bIPDV: IP Packet Delay Variation; ^cIPER: IP Packet Error Ratio; ^dIPLR: IP Packet Loss Ratio; ^eIPTD: IP Packet Transfer Delay; ^fQoS: Quality of Service; ^gVoIP: Voice over IP; ^hVTC: Video Telepresence; ⁱU: Unspecified.