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Mesh Enabled Architecture
WMC6300 Windows Users Guide
The User Priority feature also underpins a secondary feature known as Emergency Mode. The
Emergency Mode feature is also accessed by applications using the MeshAPI and can be used
to temporarily grant the user elevated priority for use in emergency situations. However, this
ability can also be tightly managed and granted by the Network Administrator through the
Device Manager as needed.
The current User Priority is assigned to every packet transmitted by the user of the node. This
priority tag is preserved in each packet as it passes through the mesh until it reaches the final
destination or the wired network
Packet classification is based on the current User Priority setting and determines the latency,
throughput, and reliability of the transmission of the packet, in both relative and absolute terms.
For example, packets of one class may be provided relatively higher throughput in the presence
of other lower-class packets, but may also have absolute time-to-live limitations, which will
impact the reliability of delivery for packets in the class.
A WMC6300 host user's current priority and maximum allowed priority may be configured within
a range of Low (priority level 0) to High (priority level 7).
This User Priority feature is unique to the MEA network and only exists between endpoints
within the MEA network or between a MEA network node and the entry/exit node on the MEA
network.
Nodes outside of the MEA Core LAN cannot request a particular priority for transmitted or
received traffic. Any traffic into the MEA network needing prioritization must be prioritized at the
entry access point or router. Any traffic out of the MEA network will lose its priority assignment
at the exit.
Service Differentiation Mechanisms
The MEA wireless mesh network leverages intelligent and adaptive transport mechanisms in
every node in the mesh, including subscriber devices, to provide QoS behaviors. At each hop,
the DSCP and User Priority classifications serve as inputs to dictate transport behaviors using
these mechanisms. In this way, the mesh nodes cooperate to provide appropriate transport
service to packets, even across multiple hops through the mesh
Intelligent Access Point Support for Quality of Service
The Intelligent Access Point (IAP) queues and shapes traffic as it is relayed into the wireless
mesh from the wire, in accordance with the DSCP coding in each packet. As many deployment
scenarios have the vast majority of packets entering the mesh at the access points, this
mechanism is particularly effective for shaping the traffic in a manner that optimizes the use of
bandwidth at what is the main point of contention on most networks.
The IAP provides pre-determined QoS levels to its data traffic it. Applications sending data that
need prioritized traffic may be configured to set the TOS values in the IP packets at the
source/destination devices. IAP support for QoS also provides equal fairness to all traffic within
the same precedence class (TOS). Enabling QoS support on an IAP slightly increases priority of
best effort UDP traffic over the TCP traffic.
The entries in the table below show the minimum guaranteed bandwidth to traffic at various
precedence levels. In the absence of traffic at any class, the bandwidth will be distributed
amongst other classes, insuring that no bandwidth is wasted.
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