I.1 Traffic‐load DefinitionI.2 Traffic Congestion and GoS/QoSI.3 System CapacityI.4 Teletraffic ModelsI.5 Traffic‐load PropertiesI.6 Call Arrival ProcessI.7 Call Service TimeI.8 Service SystemsI.9 Little's LawI.10 Other Performance Metrics of Loss SystemsI.11 General ExamplesI.12 Service‐classes – Bandwidth Sharing PoliciesI.13 Classification of Teletraffic Loss ModelsI.14 Teletraffic Models and the InternetReferences