Chapter 7: Operation
Spectrum Management
Page 7-37
Attribute
Meaning
Hopping Period
The Spectrum Management algorithm evaluates the metrics 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 channel 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 (not
configurable)
This 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
instantaneous channel hops. If the measured interference on a
channel exceeds the specified threshold, then DSO will instruct the
wireless to immediately move to a better channel. If a better channel
cannot be found the PTP 670 Series will continue to use the current
active channel. (Default –85 dBm).
Channel Bandwidth
(not configurable)
This shows the value of the variable channel bandwidth selected.
Tx Color Code (not
configurable)
This shows the Tx Color Code selected during Installation.
Rx Color Code (not
configurable)
This shows the Rx Color Code selected during Installation.
Interpreting the receive spectrum plot
The Spectrum Expert page has two graphical plots:
•
Local Receive Spectrum
•
Peer Receive Spectrum
A more detailed example of one of these plots is shown in
For more information, select the Help hyperlink at the top right of the Spectrum Expert page
and follow the instructions.
X axis and Y axis
The X-axis shows a stylized view of the selectable wireless channels. Note that the distance
between adjacent channels may be smaller than the channel bandwidth. If this is the case,
adjacent channels overlap. Channels are displayed separately for clarity. The axis is labeled
using the channel center frequencies in MHz. The Y-axis shows the interference power levels
from –100 to –40 dBm.