Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide System Configuration

phn-4980_001v004 August 2019)

2-21

Note

Care must be taken to ensure enough frequencies are available for the radio to hop

within the required regulations.

In particular, under FHSS rules (less than 663 Kbps) the radio must have enough frequency bandwidth

as required under FCC rules;

– For FHSS systems operating in the 902-928 MHz band, if the 20 dB bandwidth of the

hopping channel is less than 250 kHz, the system shall use at least 50 hopping

frequencies. The average time of occupancy on any frequency shall not be greater than

0.4 seconds within a 20 second period.

– If the 20 dB bandwidth of the hopping channel is 250 kHz or greater, the system shall

use at least 25 hopping frequencies and the average time of occupancy on any

frequency shall not be greater than 0.4 seconds within a 10 second period.

– The maximum allowed 20 dB bandwidth of the hopping channel is 500 kHz.

– Under DTS rules (greater than or equal to 663kbps) there is no limit on the minimum

bandwidth for the Radio as it may operate on one frequency, therefore the lower and

upper edge of the band may be reduced if the full 902 to 928MHz ISM range is not

required.

– ISM start/stop frequency: These parameters specify the beginning and end of the RF

band allocated for hopping.

– ISM exclude frequency: These parameters specify the beginning and end of an

excluded band within the band specified by “ISM start/stop frequency”. If an excluded

band is specified, the hop pattern avoids hopping with the excluded band.

Single Frequency?

o When selected, the radio will operate on a single frequency (tx and rx)

Hop Pattern

A Hop Pattern of 0 fixes the frequency to a single channel (DTS Modulations ONLY).

A Hop Pattern of 1 creates a pseudo random hopping sequence through the available channels.

A Hop Pattern of 2 - 9 is a uniform step through the defined channels as follows:

2: Every other available channel

3: Every 3

rd

available channel

4: Every 4

th

available channel

And so on.

For FHSS (less than 633kbps) the Hop Pattern should be set to 1.

For DTS (633kbps and above) the Hop Pattern may be set anywhere from 0 – 9.

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