Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide

Technical Reference

phn-4673_002v000 (March 2018)

3-6

Transmit Rates

Transmit rates (or Modulations) are set in the GUI from a list available for that particular radio’s available

bandwidths and modulation rates. Adaptive modulation or Multi-Speed Multipoint can be used in PTP

or PMP networks. In PMP networks the radio must be configured to support the minimum max payload

size and for AP’s the modulation must have enough link budget to reach the furthese EP. For PTP

networks, MSMP works in both directions and there is no constraint on minimum max payload bytes.

Access Point Transmit Rates

In a PTP network the Access Point Transmit Rate works in the same way as the End Point Transmit Rates and

will adjust speed based on signal quality.

In a PMP network the ISM Access Point Transmit Rate is fixed to a single modulation; the one limiting factor

in a PMP network is that all remote End Point radios must be able to receive the Access Point, therefore the

Access Point must transmit at a rate suitable for the furthest remote End Point to receive.

ISM Access Point Transmit Rate selection also depends on the amount of data that needs to be moved

from the Access Point Radio to the End Point Radio(s) and end device(s). In SCADA applications where

small poll requests are sent from Access Point to End Point, the Access Point Transmit Rate can be set

to a slower modulation.

End Point Transmit Rates

ISM End Point Transmit Rates can be configured with Multi-Speed Multi-Point (MSMP).

Note

Cambium Networks recommends selecting a maximum for FOUR consecutive End

Point Transmit Rates.

Refer to ISM Minimum Packet Sizes with Multi-Speed Multi-Point for minimum packet recommendations.

The radios will start transmitting data at the lowest speed and, if successful, will increase to the next

selected speed. The radio dynamically changes the data rate based upon signal quality measurements.

The advantage is to allow radios that have a good RF connection to maintain a high-speed link to the

Access Point while radios on the same network that have a poor RF connection can maintain a link at a

slower data rate without penalizing the “good link” radios. The available modulations range from the

FHSS modes of 57 kbps – 229 kbps to the DTS modes of 663 kbps – 3535 kbps. The primary difference

between the modes is the bandwidth of the signal and the required strength of signal received at the

radio.

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