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Chapter 1: Product description
Wireless operation
Page 1-17
Spectrum management in fixed frequency mode
The transmit and receive frequencies can be fixed in a PTP 670 wireless link. Once fixed
frequency mode is configured, the spectrum management software will not attempt to move
the wireless link to a channel with lower co-channel and adjacent-channel interference.
Therefore this mode of operation is only recommended for deployments where the installer
has a good understanding of the prevailing interference environment. Care must also be taken
to ensure that the frequency allocations at each end of the link are compatible.
Fixed frequency mode is not available in regions where radar detection is required by the
regulations.
Further reading
For information about…
Refer to…
How to perform spectrum management
Spectrum Management
Adaptive modulation
The PTP 670 series can transport data over the wireless link using a number of different
modulation modes ranging from 256QAM 0.81 to BPSK 0.63. For a given channel bandwidth
and TDD frame structure, each modulation mode transports data at a fixed rate. Also, the
receiver requires a minimum signal to noise ratio in order to successfully demodulate a given
modulation mode. Although the more complex modulations such as 256QAM 0.81 will
transport data at a much higher rate than the less complex modulation modes, the receiver
requires a much higher signal to noise ratio.
The PTP 670 series provides an adaptive modulation scheme where the receiver constantly
monitors the quality of the received signal and notifies the far end of the link of the optimum
modulation mode with which to transmit. In this way, optimum capacity is achieved at all
times. This is one of a number of features which allows the PTP 670 to operate in challenging
non-line of sight radio channels.
Note
LINKPlanner includes an estimate of mean data rate, the data rate provided by each
modulation and the percentage of time spent in each modulation mode.
Further reading
For information about…
Refer to…
Lowest data modulation mode
Lowest TDM modulation mode
Planning for adaptive modulation
Effect of modulation mode on link data
throughput capacity
Calculating data rate capacity
Содержание PTP 670 Series
Страница 1: ...F Cambium PTP 670 Series User Guide System Release 670 02 50 ...
Страница 349: ...Chapter 5 Installation Installing an SFP Ethernet interface Page 5 52 Correct Incorrect ...
Страница 405: ...Chapter 6 Configuration and alignment System menu Page 6 46 Figure 151 LAN Configuration page PTP topology TDM support ...
Страница 406: ...Chapter 6 Configuration and alignment System menu Page 6 47 Figure 152 LAN Configuration page PTP topology SFP support ...
Страница 408: ...Chapter 6 Configuration and alignment System menu Page 6 49 Figure 154 LAN Configuration page HCMP topology ...
Страница 416: ...Chapter 6 Configuration and alignment System menu Page 6 57 Figure 156 QoS Configuration page IP MPLS ...
Страница 445: ...Chapter 6 Configuration and alignment Management menu Page 6 86 Figure 173 Time Configuration page SNTP enabled ...
Страница 551: ...Chapter 7 Operation System statistics Page 7 64 Figure 250 Main Port Counters page when main port is bridging traffic ...