Motorola Series Switch WS5100 - Manual (Page 25)

Overview 1-15
disconnect. With QoS, the VoIP conversation (a real-time session), receives priority, maintaining a high level
of voice quality. The voice QoS used by the switch ensures:
• Strict Priority
• Spectralink Prioritization
• VOIP Prioritization (IP ToS Field)
• Multicast Prioritization
Data QoS
The switch supports the following for data QoS techniques:
• Egress Prioritization by WLAN
• Egress Prioritization by ACL
DCSCP to AC Mapping
The switch provides for the arbitrary mapping between Differentiated Services Code Point (DCSCP) values
and WMM Access Categories. This mapping can be set manually.
1.2.2.13 Wireless Layer 2 Switching
The switch supports the following layer 2 wireless switching techniques:
• WLAN to VLAN
• MU User to VLAN
• WLAN to GRE
1.2.2.14 Automatic Channel Selection
Automatic channel selection works as follows:
1. When a new AP is adopted, it scans each channel. However, the switch does not forward traffic at this
time.
2. The switch then selects the least crowded channel based on the noise and traffic detected on each
channel.
3. The algorithm used is a simplified maximum entropy algorithm for each radio, where the signal strength
from adjoining AP's/MU's associated to adjoining AP's is minimized.
4. The algorithm ensures adjoining AP's are as far away from each other as possible in terms of channel
assignment.
1.2.2.15 WMM-Unscheduled APSD
This feature is also known as WMM Power Save or WMM-UPSD (Unscheduled Power Save Delivery).
WMM-UPSD defines an unscheduled service period, which are contiguous periods of time during which the
switch is expected to be awake. If the switch establishes a downlink flow and specifies UPSD power
management, then it requests and the AP delivers buffered frames associated with that flow during an
unscheduled service period. The switch initiates an unscheduled service period by transmitting a trigger
frame, where a trigger frame is defined as a data frame (e.g. an uplink voice frame) associated with an uplink
NOTE: Individual radios can be configured to perform automatic channel selection.