D-Link DWS-1008 User Manual
18
Channel Tuning
By default, the switch evaluates the scan results for possible channel changes every 3600 seconds (1
hour). MSS uses the following parameters to determine whether to change the channel on a radio:
• Presence of active sessions.
By default, if the radio has active sessions, MSS does not change the channel. If the radio
does not have any active sessions, MSS uses the remaining parameters to determine
whether to change the channel.
• Received signal strength indication (RSSI)
• Amount of noise on the channel
• Packet retransmission count, which is the rate at which the radio receives retransmitted
packets.
• Utilization, calculated based on the number of multicast packets per second that a radio
can send on a channel while continuously sending fixed-size frames over a period of
time.
• Phy error count, which is the number of frames received by the AP radio that have physical
layer errors. A high number of Phy errors can indicate the presence of a non-802.11 device
using the same RF spectrum.
• Received CRC error count. A high number of CRC errors can indicate a hidden node or
co-channel interference.
The thresholds for these parameters are not configurable. RF Auto-Tuning also can change a radio’s
channel when the channel tuning interval expires, if a channel that has less disturbance is detected.
Disturbance is based on the number of neighbors the radio has and each neighbor’s RSSI.
A radio also can change its channel before the channel tuning interval expires to respond to RF
anomalies. An RF anomaly is a sudden major change in the RF environment, such as sudden major
interference on the channel.
By default, a radio cannot change its channel more often than every 900 seconds, regardless of the RF
environment. This channel holddown avoids unnecessary changes due to very transient RF changes,
such as activation of a microwave oven.
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