Cambium Networks cnReach N500 handleiding

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cnReach N500 User Guide

Technical Reference

phn-4673_002v000 (March 2018)

3-3

Data may be transferred in either direction. Data transfer speeds can be manipulated using the Max

Payload Bytes and Dynamic Payload settings. Refer to the How to set up a PTMP Network

section for

configuration information.

PMP Protocol Characteristics

• Any number of slaves or end points may attach to the master.

• The Master doesn’t keep track of which slaves are present – any slave may attempt to communicate with

master.

• The Master transmits data downstream in broadcast mode.

• The Master repeats each transmitted packet a configured number of times.

• Slaves or End Points respond with a request for attention if they have data to transmit.

• Master responds to an attention request with an attention grant, but data from master is still broadcast to

all.

• If slave fails to get master’s attention due to a collision, it employs a random back-off algorithm to decide

when to request attention again.

• Once a slave has the master’s attention, it may transmit data in response to each master packet; other

slaves must not transmit.

• Master acknowledges receipt of slave transmission, along with continued broadcast data.

• Slave relinquishes master attention when done transmitting data, or after a configured limit.

• Master may revoke its attention from a slave if a configured number of consecutive receive errors occur, or

if the slave does not relinquish attention after a configured limit.

• While a slave has the master’s attention, the master acknowledges the slave’s transmitted packets. If the

slave fails to receive an “acknowledge” after a configured number of transmissions, it drops the packet and

begins transmitting the next packet.

Additional Characteristics in PMP Ethernet Mode

• The Master and slave use the destination MAC address in a packet to distinguish Ethernet broadcast packets

from Ethernet addressed packets.

• Slave determines which MAC addresses are currently behind it, up to a limit.

• Any slave may acknowledge a packet addressed to one of its known MAC addresses; master stops

repeating the packet when it receives the acknowledgement.

• If no slave has master attention, an acknowledging slave transmits the acknowledge packet without

requesting master attention.

• If one slave has master attention, other slaves may not acknowledge.

Transmit Power and RSSI

Transmit Power is set in milli-Watts. The range will vary depending on the radio band and region code.

The recommendation is to not set the power level below 100mW.

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