Electronic and Postal Communications (Quality of Service) G.N. No. 416 (contd) _______ FOURTH SCHEDULE ________ (Made under Regulation 11) ________ QUALITY OF SERVICE PARAMETERS FOR INTERNET SERVICES S/NO Definition Measurement Target Values 1 The ratio of successful log-ins to access the Internet when both the access network and the ISP network are available in full working order Successful log-in ratio % Successful log-ins (ETSI EG 202 057-4; ETSI TS 102 250-2) Dial-up users must be able to connect at least 90% of the time Leased line users must be able to connect at least 99% of the time 2 Delay (one way transmission time) The delay is half the time in Half the time in National network latency (twomilliseconds that is needed for an milliseconds that is way) ≤85ms ICMP Echo Request/Reply (Ping) to needed for an ICMP a valid IP address Echo Request/ Reply International network latency (Ping) to a valid IP (two-way) ≤300 ms address. Measurement provided as the mean value of the delay (in ms) (ETSI EG 202 057-4) For international network latency, the measurement is carried by sending a PING packet from the test point to the first international point of presence. (ITU-T Rec. Y.1541). Mean upper bound for each class of service is specified in, for example the mean upper 19