User's Manual Part 1
Release8OverviewofCycloneNetworks
Issue2,November2007 Draft5forRegulatoryReview 88
An example of the DiffServe tab in the Configuration page and parameter descriptions
are provided under
DiffServe Tab of the AP on Page 259. This tab and its rules are
identical from module type to module type in Cyclone. However, any of the 61
configurable Code Points can be set to a different value from module to module, thus
defining unique per-hop behavior for some traffic.
This tab in the AP and BHM sets the priorities for the various packets in the downstream
(sent from the public network). This tab in the SM and BHS sets the priorities for the
various packets in the upstream (sent to the public network).
Typically in the Cyclone network, some SMs attach to older devices that use the ToS
byte as originally formatted, and others to newer devices that use the DSCP field. The
default values in the DiffServe tab allow your modules to prioritize traffic from the older
devices roughly the same as they traditionally have. However, these default values may
result in more high-priority traffic as DSCP fields from the newer devices are read and
handled. So, after making any changes in the DiffServe tab, carefully monitor the high-
priority channel for high packet rates
◦ in SMs that you have identified as those to initially set and watch.
◦ across your Cyclone network when you have broadly implemented Code Point
values, such as via SNMP.
The Cyclone frame structure is illustrated in
Figure 22.
Con-
trol
Beacon Data
AP Transmit (Downlink) AP Receive (Uplink)
DataAck
Con-
trol
Ack
Con-
trol
Beacon Data
AP Transmit (Downlink) AP Receive (Uplink)
DataAck
Con-
trol
Ack
Figure 22: Cyclone frame structure
7.1.12 HardwareScheduling
Cyclone Release 8 supports only hardware scheduling. Hardware scheduling always
sends high-priority traffic first, even to the exclusion of other traffic.
IMPORTANT!
The number of channels available to the AP is reduced by the number of SMs
configured for the high-priority channel. With this feature enabled on all SMs, an
AP can support 100 SMs (instead of 200).
Cyclone Release 8 requires APs, BHs, and AES SMs to be Series P9 or later hardware.
3
The characteristics of hardware scheduling in a Cyclone sector are summarized in
Table 22.
3
See
Designations for Hardware in Radios on Page 164.