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5 General Considerations 5.1 Spectrum Planning
The PTP 400 Series Bridge has three frequency variants in its product range.
Band Definition Frequency
Coverage
Channel
Width
Channel
Raster
4.9 GHz USA National Public Safety Band 4940-4990 MHz 10 MHz 5 MHz
5.4 GHz ETSI 5 GHz band B 5470-5725 MHz 11 MHz 12 MHz
5.8 GHz USA ISM Band / ETSI 5 GHz band C 5725-5850 MHz 11 MHz 6 MHz
Table 6 - PTP 400 Series Bridge Frequency Variants
There are two distinct approaches to spectrum planning:
First, an operator can utilize the default spectrum management mode i-DFS (intelligent
Dynamic Frequency Selection). This mode uses the PTP 400 Series Bridge’s ability to
measure the interference levels in all channels to build up a picture of the interference / noise
levels in all channels. The PTP 400 Series Bridge uses statistical techniques to select the
most appropriate transmit and receive channels. I-DFS can be influenced in its channel
decision process by selectively barring channels from use. The use of this functionality is
described in detail in section 8.3.8 “Spectrum Management”.
Second, when detailed control of the spectrum allocation is required it is recommended that
the fixed frequency mode is used to statically allocate transmit and receive channels.