Motorola RFS Series Reference Manual page 24

1-14 Motorola RF Switch Systen Reference
MU Move Command
As a value added proprietary feature between Motorola infrastructure products and Motorola MUs, a move
command has been introduced. The move command permits an MU to roam between ports connected to the
same switch without the need to perform the full association and authentication defined by the 802.11
standard. The move command is a simple packet up/packet back exchange with the Access Port. Verification
of this feature is dependent on its implementation in one or more mobile units.
1.2.2.12 Power Save Polling
An MU uses Power Save Polling (PSP) to reduce power consumption. When an MU is in PSP mode, the switch
buffers its packets and delivers them using the DTIM interval. The PSP-Poll packet polls the AP for buffered
packets. The PSP null data frame is used by the MU to signal the current PSP state to the AP.
1.2.2.13 QoS
QoS provides a data traffic prioritization scheme. QoS reduces congestion from excessive traffic.
If there is enough bandwidth for all users and applications (unlikely because excessive bandwidth comes at
a very high cost), then applying QoS has very little value. QoS provides policy enforcement for mission-critical
applications and/or users that have critical bandwidth requirements when the switch's bandwidth is shared
by different users and applications.
QoS helps ensure each WLAN on the switch receives a fair share of the overall bandwidth, either equally or
as per the proportion configured. Packets directed towards MUs are classified into categories such as
Management, Voice and Data. Packets within each category are processed based on the weights defined for
each WLAN.
The switch supports the following QoS mechanisms:
802.11e QoS
802.11e enables real-time audio and video streams to be assigned a higher priority over data traffic. The
switch supports the following 802.11e features:
• Basic WMM
• WMM Linked to 802.1p Priorities
• WMM Linked to DSCP Priorities
• Fully Configurable WMM
• Admission Control
• Unscheduled-APSD
• TSPEC Negotiation
• Block ACKQBSS Beacon Element
802.1p Support
802.1p is a standard for providing QoS in 802-based networks. 802.1p uses three bits to allow switches to
re-order packets based on priority level.
Voice QoS
When switch resources are shared between a Voice over IP (VoIP) conversation and a file transfer, bandwidth
is normally exploited by the file transfer, thus reducing the quality of the conversation or even causing it to