User Manual

Web Page Reference

102

Hopping Margin:Spectrum Management uses this margin when making a channel hop decision.

The target channel has to have an interference level 3 dB (default) better than the current active

channel.

Hopping Period (not conﬁgurable):The Spectrum Management algorithm evaluates the met-

rics every ‘Hopping Period’ seconds (180 seconds by default) looking for a channel with lower levels

of interference. If a better channel is located, Spectrum Management performs an automated chan-

nel hop. If SNMP or SMTP alerts are enabled an SNMP TRAP or an email alert is sent warning

the system administrator of the channel change.

Hopping Counter:is used to record the number of channel hops. The number in the “(+)”

brackets indicates the number of channel changes since the last screen refresh.

Interference Threshold:Spectrum Management uses the interference threshold to perform in-

stantaneous channel hops. If the measured interference on a channel exceeds the speciﬁed threshold,

then iDFS will instruct the wireless to immediately move to a better channel. If a better channel

cannot be found the 500 Series Bridge will continue to use the current active channel. (Default -85

dBm)

Asymmetric DFS:The default conﬁguration of symmetric operation constrains the link to op-

erate symmetrically, using the same transmit and receive channels. When in symmetric mode the

slave unit will always follow the master. If the master moves to a new channel the slave will hop

to the same channel. When the Point-to-Point link is conﬁgured as an asymmetric link both the

master and slave are free to select the best channel from their own set of local interference metrics.

Channel Bandwidth (not conﬁgurable):shows the value of the variable channel bandwidth

selected.

8.3.7.6 Barring Channels

Channels can only be barred / unbarred by the system administrator from the master Spectrum

Management web page. The barring / unbarring operations are disabled on the slave web page. If

an attempt to bar / unbar a channel is made at the slave, a warning dialog is generated.

Barring/Unbarring of channels is performed by clicking the appropriate channel on the local or

peer channel spectrum plots on the master web page. Each bar / unbar attempt will be proceeded

by a conﬁrmation dialog. It should be noted that the channel bar will take eﬀect immediately and

is not related to the measurement quantization period.

8.3.7.7 Master and Slave Channel Spectrum Graphics

Spectrum Management presents its computed statistical measurements in a graphical display on

both the master and slave Spectrum Management web page.