This book summarizes the key Quality of Service technologies deployed in
telecommunications networks: Ethernet, IP, and MPLS. The QoS of the
network is made up of two parts: fault and resource management.
Network operation quality is among the functions to be fulfilled in
order to offer QoS to the end user. It is characterized by four
parameters: packet loss, delay, jitter or the variation of delay over
time, and availability. Resource management employs mechanisms that
enable the first three parameters to be guaranteed or optimized. Fault
management aims to ensure continuity of service.