Web Page Reference
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If you cannot communicate with the unit after 120 seconds, this could indicate a problem with the
memory update process. Under these circumstances the user should enter “Recovery Mode”, see
“Recovery Mode”.
After the reboot the user should check that the required software image is loaded and running.
NOTE:
Please ensure that you are upgrading the correct units. Units cannot be downgraded..
8.3.7
Spectrum Management
Spectrum Management Selection is the PTP 500 Series Bridge feature that monitors the available
wireless spectrum and directs both ends of the wireless link to operate on a channel with a minimum
level of co-channel and adjacent channel interference.
8.3.7.1
Wireless Channels
The PTP 500 Series Bridge operates using a set of predefined overlapping channels. There are a
different number of channels, depending on the raster mode selected. Each channel occupies 15
MHz of wireless spectrum and is offset in center frequency from its neighboring channel by 5 MHz.
It is important to note that adjacent channels on the Spectrum management display have a 5 MHz
overlap to the adjacent channel.
The default channelization can be modified by varying the lower center frequency attribute in
the installation wizard - see
“Wireless Configuration”. See
“General
Considerations” for more detail.
8.3.7.2
Spectrum Management Measurements
The 500 Series Bridge performs two mean signal measurements per TDD cycle, per channel. This
mean measurement represents the mean received signal power for the 40 microseconds measurement
period.
The Spectrum Management algorithm collects measurements equally from all channels.
This process is called the Channel Availability Check (hereafter referred to by the acronym CAC).
The CAC uses a round-robin channel selection process to collect an equal amount of measurements
from each channel. It is important to note that the CAC measurement process is not altered by
the channel barring process. Measurements are still collected for all channels irrespective of the
number of barred channels.
8.3.7.3
Measurement Analysis
Spectrum Management uses statistical analysis to process the received peak and mean measure-
ment. The statistical analysis is based on a fixed, one minute, measurement quantization period.
Spectrum Management collects data for the specified quantization period and only at the end of
the period is the statistical analysis performed.
The analysis produces three key metrics for each channel:
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Страница 1: ...PTP 500 Series User Guide phn 1115 000v001 ...
Страница 74: ...Web Page Reference 74 Figure 37 Save Configuration File Screen ...
Страница 100: ...Web Page Reference 100 Figure 59 Spectrum Management as seen from the Master ...
Страница 108: ...Web Page Reference 108 Figure 66 Spectrum Management Master Screen With Operational Restrictions ...
Страница 112: ...Web Page Reference 112 Figure 68 Remote Management ...
Страница 165: ...Data Rate Calculations 165 Figure 112 QPSK 0 50 Single Payload Figure 113 QPSK 0 75 Single Payload ...
Страница 166: ...Data Rate Calculations 166 Figure 114 16 QAM 0 50 Single Payload Figure 115 16 QAM 0 75 Single Payload ...
Страница 167: ...Data Rate Calculations 167 Figure 116 64 QAM 0 67 Single Payload Figure 117 64 QAM 0 83 Single Payload ...
Страница 168: ...Data Rate Calculations 168 Figure 118 256 QAM 0 75 Single Payload Figure 119 QPSK 0 50 Dual Payload ...
Страница 169: ...Data Rate Calculations 169 Figure 120 QPSK 0 75 Dual Payload Figure 121 16 QAM 0 50 Dual Payload ...
Страница 170: ...Data Rate Calculations 170 Figure 122 16 QAM 0 75 Dual Payload Figure 123 64 QAM 0 67 Dual Payload ...
Страница 171: ...Data Rate Calculations 171 Figure 124 64 QAM 0 83 Dual Payload Figure 125 256 QAM 0 75 Dual Payload ...
Страница 197: ...Glossary 197 UTP Unshielded Twisted Pair VLAN Virtual Local Area Network ...
