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Table 2 Service class requirements for T2W services

From: A novel network architecture for train-to-wayside communication with quality of service over heterogeneous wireless networks

Class Delay Jitter Loss Services
A < 1s - - Passenger internet; crew intranet; diagnostics; application update; content update
B < 0.5 s - - TCMS event
C < 1s - < 110−3 CCTV security
D < 0.07 s < 0.016 s < 1.10−2 Intercom (VoIP)
E < 0.2 s - < 110−2 CCTV safety
F < 1s - < 110−6 TCMS cyclic
G < 1s < 0.1 s < 110−2 Public address; PIS data; configuration traffic
  1. (a dash (-) means that this metric is no hard requirement for a given service)