User Manual

WipLL System Description
9-2 of 9-6 Issue 03
Draft 02
1QDF10134AAP-SYD-FCC
9.4. Improved Quality of Service (QoS)
 QoS is the ability to recognize the type of transmission and assign optimal
resources accordingly. This is especially important for VoIP applications,
that are sensitive to delay and jitter and should therefore be prioritized over
other applications.
 QoS is used for packets leaving the SPRs towards the BSR as well as among
SPRs making sure that the BSR assigns the correct priority to the correct
SPR.
 WipLL 1.4 now provides eight (8) levels of priority: 0 through 7. Priorities
are based on source IP address or ranges of addresses, destination IP address
or ranges of addresses, protocol type (UDP, TCP, ICMP) and TCP/UDP
ports which actually define the applications, such as a WEB application on
port 80).
 When a packet arrives from the Ethernet network to an SPR, the system
recognizes the type of the packet and assigns it with a Time-To-Live (TTL)
value.
 TTL determines which packets go first, where packets share the same
priority.
 Each packet is marked whether critical or not, to determine if it should be
sent when TTL expires or it should be dropped.
 Higher priority packets always go first regardless of the TTL of lower
priority packets.
9.5. Bandwidth limitations
The BSR receives and transmits data to multiple SPRs. Using WipManage the user
can set the maximum bandwidth values for different SPRs.
With good planning and minimal system congestion, each SPR can use the
maximum defined bandwidth, so long as does not exceed the maximum overall
bandwidth.
In a congested network, the real maximum bandwidth for an SPR cannot reach the
defined value, but is still in proportion to the value configured. For example, an SPR