Siemens HiPath 3000 Series - Qos - Quality of Service; Goals of Qos; Qos in the Router

h3h5_in_the_lan.fm
A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation
13-5
Nur für den internen Gebrauch HiPath 3000/5000 in the LAN Network
QoS - Quality of Service
13.3 QoS - Quality of Service
13.3.1 Goals of QoS
13.3.2 QoS in the Router
● QoS functions control router priorities and timing.
● Router queues are optimized for routing and are not suitable for QoS monitoring of voice
transmission
● Fragmentation (if used) takes time and thereby increases the risk of packet loss
● Time-controlled hierarchical policies not available
● No feedback due to insufficient monitoring
● Architecture not suitable for specialized VoIP control functions
Topic Cross Reference
Goals of QoS Abschnitt 13.3.1 auf
Seite 13-5
QoS in the Router Abschnitt 13.3.2 auf
Seite 13-5
Problems:
● IP does not guarantee any bandwidths
● QoS is not part of H.323
Consequences ● Time problems due to large e-mail attachments and web surfing
● Network congestion due to multiple requests for the same web page
● Reduced voice quality due to
– Delay (decline in voice quality due to delay)
– Variable delays (decline in voice quality due to jitter)
– Packet loss (decline in voice quality due to packet loss)
Goals: ● QoS is required in the WAN/LAN for
– Optimum voice quality for every connection
– Fewer interruptions